Genus: Anthidium Fabricius, 1804
Subgenus: A. (Anthidium) Fabricius, 1804
Species: Anthidium maculifrons Smith, 1854
Common name: none
Anthidium (Anthidium) maculifrons are dark brown to black with yellow maculations (Gonzalez and Griswold 2013). Females have white pubescence except for yellow to brown hairs on the vertex, scutum, axilla, scutellum, tarsi, and S6. Females have a body length of 9.2–11.2 mm, and males range in length from 9.2–16.9 mm (Gonzalez and Griswold 2013).
(modified from Gonzalez and Griswold 2013)
- Female labrum has basal protuberances, and small, distinct preapical projections that curve upwards.
- Female mandible has 6–7 teeth.
- Female propodeal triangle is dull, and finely imbricate to lineolate.
- Female hind tibia with anterior carina present.
- Female T1–T5 discal areas are elevated, and dull, weakly shiny, and weakly imbricate between punctures.
- Female T1–T5 depressed marginal zones have coarse punctures.
- Female T1–T5 distal margins are thick, carinate, and narrow.
- Female T6 has a small, blunt lateral angle, crenulate preapical carina, and depressed apical rim.
- Male hind coxa and trochanters have a small ventral spine.
- Male labrum basal protuberances are a similar size to those seen in females, and preapical projections that are larger than those in females.
- Male S4 with a narrow median apical brush of sparse, reddish-brown hair.
- Male S4 apical margin is slightly convex medially.
- Male S6 basal margin is convex and the apical margin is sinuous.
- Male S7 is truncate or rounded apically and sinuous laterally.
- Male S8 apical process is broad, long, and bilobed
- Male T6 lateral spine is curved and as long as the T7 median spine.
- Male T7 lateral lobe is digitiform.
May be confused with
Female A. maculifrons may be confused with A. cochimi due to the elevated discal areas of T1–T5, crenulate preapical carina and small, lateral projections on T6 (Gonzalez and Griswold 2013). Female A. maculifrons can be differentiated from A. cochimi by their clypeus without modified hairs, labrum with small and distinct preapical projections, and sparser tomentum on the outer surface of the basitarsi (Gonzalez and Griswold 2013). Male A. maculifrons can be differentiated from A. cochimi, and all other New World Anthidium, by the small ventral spine on the hind coxa and trochanters, digitiform lateral lobe on T7, and long, bifid apical process on S8.
Anthidium maculifrons adults have been recorded in flight throughout the year, with peak activity occurring from August to the first half of October (Gonzalez and Griswold 2013).
Anthidium maculifrons is a generalist that has been observed visiting a variety of species within Apocynaceae, Asteraceae, Diapensiaceae, Fabaceae, Lamiaceae, and Rubiaceae (Gonzalez and Griswold 2013).
Nesting behavior is unknown.
Anthidium maculifrons occur from Costa Rica to southern Ontario, Canada. Within the U.S., they range from Arizona and Colorado to the East Coast. They are found primarily in dry forests, pine-oak ecoregions, and temperature forests. They are absent in xeric regions. Anthidium maculifrons is the most abundant and widely distributed Anthidium species in Mesoamerica (Gonzalez and Griswold 2013).
Anthidium maculifrons female face, photo: Jeni Sidwell
Anthidium maculifrons female lateral habitus, photo: Jeni Sidwell
Anthidium maculifrons female abdomen, photo: Jeni Sidwell
Anthidium maculifrons female, diagram showing the dorsal view of the sixth tergite (T6), diagram from Gonzalez and Griswold 2013
Anthidium maculifrons male face, photo: Jeni Sidwell
Anthidium maculifrons male lateral habitus, photo: Jeni Sidwell
Anthidium maculifrons male abdomen, photo: Jeni Sidwell
Anthidium maculifrons male, ventral view of fourth sternum (S4), photo: Victor Gonzalez
Anthidium maculifrons male, dorsal view of seventh tergum (T7), photo: Jeni Sidwell
Anthidium maculifrons male, diagram showing dorsal view of seventh tergum (T7), diagram by Victor Gonzalez
Anthidium maculifrons male, diagram showing ventral view of sixth sternum (S6), diagram by Victor Gonzalez
Anthidium maculifrons male, diagram showing ventral view of seventh sternum (S7), diagram by Victor Gonzalez
Anthidium maculifrons male, diagram showing ventral view of eighth sternum (S8), diagram by Victor Gonzalez