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Lateral view of coxa, adult . Hind coxae lacking dorsal spine. Photo by Jean Claude Rakotonirina, Antweb.org , modified. Lateral view of coxa, adult . Hind coxae lacking dorsal spine. Photo by Jean Claude Rakotonirina, Antweb.org, modified.
Leptogenys falcigera
Lateral view of coxa, adult . Hind coxae lacking dorsal spine. Photo by Jean Claude Rakotonirina, Antweb.org, modified.
Lateral view of gaster, adult . Distinct constriction between abdominal segments 3 and 4 (arrow). Note longitudinal furrows lacking on abdominal segment 4. Photo by Jean Claude Rakotonirina, Antweb.org , modified. Lateral view of gaster, adult . Distinct constriction between abdominal segments 3 and 4 (arrow). Note longitudinal furrows lacking on abdominal segment 4. Photo by Jean Claude Rakotonirina, Antweb.org, modified.
Leptogenys falcigera
Lateral view of gaster, adult . Distinct constriction between abdominal segments 3 and 4 (arrow). Note longitudinal furrows lacking on abdominal segment 4. Photo by Jean Claude Rakotonirina, Antweb.org, modified.
Adult worker and queen in the species' native range. Photo by ©Alexander L. Wild, alexanderwild.com Adult worker and queen in the species' native range. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema humile
Adult worker and queen in the species' native range. Photo by ©Alexander L. Wild, alexanderwild.com
Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema humile
Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com

Adult tending a citrus scale insect for honeydew. Photo by ©Alexander L. Wild, alexanderwild.com Adult tending a citrus scale insect for honeydew. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema humile
Adult tending a citrus scale insect for honeydew. Photo by ©Alexander L. Wild, alexanderwild.com
A feisty little Argentine ant ( Linepithema humile ) attacks a much larger fire ant ( Solenopsis invicta ). Both species co-exist naturally in subtropical South America, but in the southern United States where both have been accidentally introduced, the fire ant has displaced the Argentine ant Photo by ©Alexander L. Wild, alexanderwild.com A feisty little Argentine ant (Linepithema humile) attacks a much larger fire ant (Solenopsis invicta). Both species co-exist naturally in subtropical South America, but in the southern United States where both have been accidentally introduced, the fire ant has displaced the Argentine ant Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema humile
A feisty little Argentine ant (Linepithema humile) attacks a much larger fire ant (Solenopsis invicta). Both species co-exist naturally in subtropical South America, but in the southern United States where both have been accidentally introduced, the fire ant has displaced the Argentine ant Photo by ©Alexander L. Wild, alexanderwild.com
A trail of Argentine ants. Photo by ©Alexander L. Wild, alexanderwild.com A trail of Argentine ants. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema humile
A trail of Argentine ants. Photo by ©Alexander L. Wild, alexanderwild.com
Lateral view of body, entire, adult worker. Head and body approximately uniform in color. Lateral view of body, entire, adult worker. Head and body approximately uniform in color.
Linepithema humile
Lateral view of body, entire, adult worker. Head and body approximately uniform in color.

Lateral view of body, surface characters, adult worker. Erect hairs lacking from cephalic dorsum (above eye level), pronotum, and gastral tergites 1 and 2. Lateral view of body, surface characters, adult worker. Erect hairs lacking from cephalic dorsum (above eye level), pronotum, and gastral tergites 1 and 2.
Linepithema humile
Lateral view of body, surface characters, adult worker. Erect hairs lacking from cephalic dorsum (above eye level), pronotum, and gastral tergites 1 and 2.
Lateral view of body, surface characters, adult worker. Erect hairs are absent on cephalic dorsum (above eye level), gastral tergites 1 and 2, and are often also present on the pronotum. Used in Antkey to separate Linepithema humile from Linepithema iniquum . Lateral view of body, surface characters, adult worker. Erect hairs are absent on cephalic dorsum (above eye level), gastral tergites 1 and 2, and are often also present on the pronotum. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Linepithema humile
Lateral view of body, surface characters, adult worker. Erect hairs are absent on cephalic dorsum (above eye level), gastral tergites 1 and 2, and are often also present on the pronotum. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Anterior view of head, adult worker. Head and body approximately uniform in color. Anterior view of head, adult worker. Head and body approximately uniform in color.
Linepithema humile
Anterior view of head, adult worker. Head and body approximately uniform in color.
Close-up view of antenna, adult worker. Antennal club indistinct. Close-up view of antenna, adult worker. Antennal club indistinct.
Linepithema humile
Close-up view of antenna, adult worker. Antennal club indistinct.

Anterior view of eye / ocellus, adult worker. Eyes situated distinctly below midline of face. Anterior view of eye / ocellus, adult worker. Eyes situated distinctly below midline of face.
Linepithema humile
Anterior view of eye / ocellus, adult worker. Eyes situated distinctly below midline of face.
Anterior dorsal view of mandibles, adult worker. Mandible lacking distinct basal angle. Anterior dorsal view of mandibles, adult worker. Mandible lacking distinct basal angle.
Linepithema humile
Anterior dorsal view of mandibles, adult worker. Mandible lacking distinct basal angle.
Lateral view of thorax / mesosoma, adult worker. Profile of mesosomal dorsum with two distinct convexities. Lateral view of thorax / mesosoma, adult worker. Profile of mesosomal dorsum with two distinct convexities.
Linepithema humile
Lateral view of thorax / mesosoma, adult worker. Profile of mesosomal dorsum with two distinct convexities.
Lateral view of thorax / mesosoma, adult worker. The profile of mesosomal dorsum with only two distinct convexities (promesonotum and propodeum). The metanotum is not distinctly raised. Used in Antkey to separate Linepithema humile from Linepithema iniquum . Lateral view of thorax / mesosoma, adult worker. The profile of mesosomal dorsum with only two distinct convexities (promesonotum and propodeum). The metanotum is not distinctly raised. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Linepithema humile
Lateral view of thorax / mesosoma, adult worker. The profile of mesosomal dorsum with only two distinct convexities (promesonotum and propodeum). The metanotum is not distinctly raised. Used in Antkey to separate Linepithema humile from Linepithema iniquum.

Lateral view of thorax / mesosoma, adult . Metanotal impression (arrow). Note also the mesosoma dorsum lacking erect hairs. Lateral view of thorax / mesosoma, adult . Metanotal impression (arrow). Note also the mesosoma dorsum lacking erect hairs.
Linepithema humile
Lateral view of thorax / mesosoma, adult . Metanotal impression (arrow). Note also the mesosoma dorsum lacking erect hairs.
Lateral view of propodeum, adult worker. Propodeum shape. Lateral view of propodeum, adult worker. Propodeum shape.
Linepithema humile
Lateral view of propodeum, adult worker. Propodeum shape.
Lateral view of propodeum, adult worker. The propodeum is angular, with flat to weakly convex dorsal and posterior faces. Used in Antkey to separate Linepithema humile from Linepithema iniquum . Lateral view of propodeum, adult worker. The propodeum is angular, with flat to weakly convex dorsal and posterior faces. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Linepithema humile
Lateral view of propodeum, adult worker. The propodeum is angular, with flat to weakly convex dorsal and posterior faces. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Lateral view of propodeum, adult worker. Propodeum with dorsal surface not distinctly shorter than posterior face. Lateral view of propodeum, adult worker. Propodeum with dorsal surface not distinctly shorter than posterior face.
Linepithema humile
Lateral view of propodeum, adult worker. Propodeum with dorsal surface not distinctly shorter than posterior face.

Lateral view of thorax / mesosoma, adult worker. Dense pubescence covering mesopleura. Lateral view of thorax / mesosoma, adult worker. Dense pubescence covering mesopleura.
Linepithema humile
Lateral view of thorax / mesosoma, adult worker. Dense pubescence covering mesopleura.
Lateral view of body, surface characters, adult worker. The mesopleura and metapleural bulla covered with dense pubescence giving the surface a dull appearance. Used in Antkey to separate Linepithema humile from Linepithema iniquum . Lateral view of body, surface characters, adult worker. The mesopleura and metapleural bulla covered with dense pubescence giving the surface a dull appearance. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Linepithema humile
Lateral view of body, surface characters, adult worker. The mesopleura and metapleural bulla covered with dense pubescence giving the surface a dull appearance. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Lateral view of propodeum, adult worker. Propodeum angular, with flat to weakly convex dorsal and posterior faces. Lateral view of propodeum, adult worker. Propodeum angular, with flat to weakly convex dorsal and posterior faces.
Linepithema humile
Lateral view of propodeum, adult worker. Propodeum angular, with flat to weakly convex dorsal and posterior faces.
Lateral view of spiracle, adult worker. Propodeal spiracle on posterior border of propodeum. Lateral view of spiracle, adult worker. Propodeal spiracle on posterior border of propodeum.
Linepithema humile
Lateral view of spiracle, adult worker. Propodeal spiracle on posterior border of propodeum.

Lateral view of propodeum, adult worker. The propodeal spiracle is bordering posterior margin of the propodeum. Used in Antkey to separate Linepithema humile from Linepithema iniquum . Lateral view of propodeum, adult worker. The propodeal spiracle is bordering posterior margin of the propodeum. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Linepithema humile
Lateral view of propodeum, adult worker. The propodeal spiracle is bordering posterior margin of the propodeum. Used in Antkey to separate Linepithema humile from Linepithema iniquum.
Lateral view of waist, adult worker. Waist only one-segmented. Lateral view of waist, adult worker. Waist only one-segmented.
Linepithema humile
Lateral view of waist, adult worker. Waist only one-segmented.
Lateral view of thorax / mesosoma, adult worker. Mesosoma lacking erect hairs. Lateral view of thorax / mesosoma, adult worker. Mesosoma lacking erect hairs.
Linepithema humile
Lateral view of thorax / mesosoma, adult worker. Mesosoma lacking erect hairs.
Worker ants from neighboring colonies act aggressively towards each other. Photo by ©Alexander L. Wild, alexanderwild.com Worker ants from neighboring colonies act aggressively towards each other. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema iniquum
Worker ants from neighboring colonies act aggressively towards each other. Photo by ©Alexander L. Wild, alexanderwild.com

Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema iniquum
Adult worker. Photo by ©Alexander L. Wild, alexanderwild.com
A worker ant tends a scale insect for honeydew in an Ecuadorian cloud forest. Photo by ©Alexander L. Wild, alexanderwild.com A worker ant tends a scale insect for honeydew in an Ecuadorian cloud forest. Photo by ©Alexander L. Wild, alexanderwild.com
Linepithema iniquum
A worker ant tends a scale insect for honeydew in an Ecuadorian cloud forest. Photo by ©Alexander L. Wild, alexanderwild.com
Lateral view of body, entire, adult worker. Photo by Alexander Wild, Antweb.org . Lateral view of body, entire, adult worker. Photo by Alexander Wild, Antweb.org.
Linepithema iniquum
Lateral view of body, entire, adult worker. Photo by Alexander Wild, Antweb.org.
Lateral view of body, entire, adult. Erect hairs on cephalic dorsum (above eye level) and on gastral tergites 1 and 2. Lateral view of body, entire, adult. Erect hairs on cephalic dorsum (above eye level) and on gastral tergites 1 and 2.
Linepithema iniquum
Lateral view of body, entire, adult. Erect hairs on cephalic dorsum (above eye level) and on gastral tergites 1 and 2.