Weevils - Entomological Society of Canada

sparse scales, these minute beyond antennal insertion. Rostrum of
female L4-1.5 times longer than pronotum, similar to that of male, but
finely alutaceous throughout. Antennae inserted between basal 0'2-0'3
of rostrum. Pronotum at base about as long as wide; sides slightly
expanded to middle; apex distinctly constricted; basal flange absent; disc
stightly to distinctly (especially in female) convex, with deep punctures
bearing fine scales; interpuncture spaces finely alutaceous' Elytra
I.5-1.7 times longer than wide; striae deeply impressed, with coarse
punctures and with scales generally coarser than those on adjacent
interstriae; interstriae more than twice as wide as striae, convex, nearly
smooth, each interstria with 1 row of minute punctures bearing scales
similar to those on dorsal surface of pronotum; interstria 7 with 1 long
specialized seta. Femora of male middle legs slightly stouter than femora
of hind legs. Segment 1 of mesotarsus with inner apical margin
produced into spine.
Distribution. Eastern and midwestern United States as far
north as Detroit, Mich. Not recorded in Canada but probably occurs in
southern Ontario.
Comments. This species belongs in the subgenus Ceratapion and
is not close to any Canadian species in the subgenus. It is distinguished
by the characters given in the key. Adults have been collected from May
through September. They have been taken on species of tick trefoil
(Desmodium species); Kissinger (1963) records finding larvae,
presumably of this species, boring in the pith of stems of Desmodium
species. Kissinger (1968) designated the lectotype.
Ap ion pen nsylvan icurn Boheman
Figs. 50, 116, Il7 ; Map 2l
Ap io n. p en n sy lu anicu m Boheman, 1 8 39 : 4 1 7 (lectotype,'Amer. Bor' " ;
NHRM); Kissinger 1968:143; Hatch 797I:329; O'Brien and Wibmer
1982:26.
Apion erythrocerum Smith, 7884:44 (lectot5,pe, New Jersey; USNM).
Description. Length 1.8-2.3 mm. Body moderately slender,
black, with light metallic luster. Pubescence consisting of white, very
fine, sparse scales. Frons I.L-1.4 times wider than tip of rostrum, with
fine, irregular, Iongitudinal sulci. Rostrum of male slightly curved, 1.5
times longer than pronotum; sides, in dorsal view, parallel on apical
third, very slightly expanded at antennal insertion, very slightly
expanded at tip; surface finely alutaceous, punctured in basal
two-thirds, polished in apical third. Rostrum of female moderately
curved, L.6-2.4 times longer than pronotum; sides, in dorsal view,
t25