Eutrichillus

Subfamily

Lamiinae

Diagnosis - adult

Body length: 6–12mm.
Eyes: eye interommatidial setaeseta:
a sclerotized hair-like projection of the cuticle
absent, eye deeply emarginateemarginate:
notched at the margin
> half width, eye ommatidial density fine.
AntennaeAntenna:
in larval and adult insects, paired segmented appendages, borne one on each side of the head, functioning as sense organs and bearing a large number of sensilla
: antennal length reaching/surpassing end of body, antennal flagellar segments elongateelongate:
much longer than wide
, scapescape:
the first proximal segment of the antenna
smooth/punctate at apexapex:
end of any structure distad to the base
, antennal scapescape:
the first proximal segment of the antenna
≥ segment 3 or segment 3 > scapescape:
the first proximal segment of the antenna
.
Pronotumpronotum:
the upper and dorsal part of the prothorax
: pronotumpronotum:
the upper and dorsal part of the prothorax
shape transversetransverse:
broader than long
, pronotumpronotum:
the upper and dorsal part of the prothorax
lateral armature acute spinespine:
a protuberance with an acute (sharp) distal end
.
Prosternum: prosternal process dilated at apexapex:
end of any structure distad to the base
, procoxal cavities closed posteriorly.
ElytraElytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
: elytral length reaching or close to end of abdomen, elytral apicesapex:
end of any structure distad to the base
rounded or truncatetruncate:
cut off squarely at the tip
or emarginateemarginate:
notched at the margin
, elytral color pattern present.
Legs: visible tarsomeres: 4, remora clavateclavate:
thickening gradually toward the tip
, protibial spurs: 2, tarsal claws simple.

Form moderate-sized, subdepressed; pubescence dense, appressed, elytraelytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
with long erect setaeseta:
a sclerotized hair-like projection of the cuticle
. Head with front convex, quadrate to transversetransverse:
broader than long
; mandibles feebly arcuatearcuate:
arched or bow-like
; genaegena:
the part of the cranium on each side below the eye
slightly convergent, shorter or longer than lower eye lobes; eyes moderate-sized, deeply emarginateemarginate:
notched at the margin
, upper lobes small, separated by varying distances; antennal tubercles prominent widely divergentdivergent:
spreading out from a common base
at basebase:
the part of any appendage or structure that is nearest the body
; antennaeantenna:
in larval and adult insects, paired segmented appendages, borne one on each side of the head, functioning as sense organs and bearing a large number of sensilla
eleven-segmented, slender, longer than body in both sexes, basal segments with some long, suberect setaeseta:
a sclerotized hair-like projection of the cuticle
beneath, scapescape:
the first proximal segment of the antenna
longer or shorter than third segment, fourth subequal to or shorter than third. Pronotumpronotum:
the upper and dorsal part of the prothorax
broader than long, sides acutely tuberculate behind middle; disk with three, often vague, calluses, one median and two behind apical margin basebase:
the part of any appendage or structure that is nearest the body
broadly, deeply impressed behind lateral spines; apexapex:
end of any structure distad to the base
vaguely, narrowly impressed; prosternum narrow, intercoxal process slender, not laminiform; mesostemum with intercoxal process narrow, slightly broader than prosternal process; metasternum with episternumepisternum:
the aspect of a thoracic pleuron dorsal to the coxal cavity and anterior to the pleural suture
narrow, subparallel. ElytraElytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
about twice or slightly more as long as broad; epipleura partially vertical; disk with small basal crests and usually small tufted tubercles, costae usually distinct; pubescence short, appressed, erect setaeseta:
a sclerotized hair-like projection of the cuticle
of varying lengths numerous to rather sparse; apicesapex:
end of any structure distad to the base
variable. Legs short; femora clavateclavate:
thickening gradually toward the tip
; tarsitarsus:
the leg segment distal to the apex of the tibia, bearing the pretarsus; consists of one to five tarsomeres (including pretarsus)
long, slender, third segment cleft to basebase:
the part of any appendage or structure that is nearest the body
. Abdomen normally segmented, last segment of females moderately elongated (Linsley and Chemsak 1995Linsley and Chemsak 1995:
Linsley, E.G. amp; J.A. Chemsak. 1995. The Cerambycidae of North America. Part VII, No. 2. Taxonomy and classification of the subfamily Lamiinae, tribes Acanthocinini through Hemilophini. University of California Press, Berkeley and Los Angeles. 292 pp.).

Similar genera

Acanthocinus, Astyleiopus

Differential diagnosis

The erect setaeseta:
a sclerotized hair-like projection of the cuticle
often arising from small hair tufts on the elytraelytron:
the leathery forewing of beetles, serving as a covering for the hind wings, commonly meeting opposite elytron in a straight line down the middle of the dorsum in repose
and narrow pro/mesosternal processes will distinguish Eutrichillus from other Acanthocinine genera.

Distribution

Nearctic south to Honduras

Recorded host plants

broadleaf; Pinus spp.

Remarks

6 species. E. comus likely not on conifers but others are. Preliminary data (Gorring, unpub.) indicate that Eutrichillus may be partially artificial with some species belonging to Acanthocinus. 

Synonyms

Ceratographis Gahan, 1888, Trans. Amer. Entomol. Soc., 15: 300

Lepturgoides Schaeffer, 1905, Brooklyn Mus. Inst. Arts Sci. Bull., 1: 166

Leiopus Lacordaire , 1872, Genera des coleopteres, 9 (2): 775 (part)

Graphisurus Horn, 1880 (not Kirby 1837), Trans. Amer. Entomol. Soc., 8: 128

Taxonomy

Eutrichillus, Bates, 1885, Biologia Centrali-Americana, Insecta, Coleoptera 5: 397.