Weevils - Entomological Society of Canada

alsobeen taken from water-cress (Nosturtium officinale), but no
feeding was observed (Salsbury 1984). Nothing else is recorded
concerning the biology or life history of this species. Kissinger (1968)
designated the lectotypes of A. pennsyluanicum and A. erythrocerum.
Apion porcatum Boheman
Figs.118,119
Apion porcatum Boheman, L839:374 (holotype, Massachusetts;
NHRM); Kissinger 1968:99; O'Brien and Wibmer 1982:26.
Description. Length 2.5-3.0 mm. Body robust, black'
Pubescence consisting of inconspicuous, very fine white scales' Frons
LL-1.2 times wider than dorsal tip of rostrum; median area wide,
bearing a shallow depression and 1 lateral line ofpunctures. Rostrum of
male slightly curved, I.2-I.4 times longer than pronotum; sides, in
dorsal view, moderately expanded at antennal insertion, narrowing to
middle; apical half nearly cylindrical; surface moderately punctured
throughout, finely alutaceous. Rostrum of female L.4-I.5 times longer
than pronotum, similar to male rostrum but more slender and with
sparser and finer punctures. Antennae inserted between basal 0'2 and
0.3 of rostrum. Eyes prominent, nearly round. Pronotum at base l'2-L.4
times as wide as long; sides moderately expanded at base, slightly
arcuate to middle, rounded to constricted apex; disc slightly and evenly
convex, with deep punctures; interpuncture spaces irregular,
alutaceous. Elytra !.2-L.3 times longer than wide; striae deep, with
coarse punctures; interstriae strongly convex, slightly wider than
striae, each interstria with 1 row of moderate punctures bearing
inconspicuous scales; interstria 9 with 1 long specialized seta. Tibiae of
male middle and hind legs with slender dentate mucrones.
Distribution. Ontario, south through the eastern United States
to northern Mississippi, and east to Iowa. Ontario: Prince Edward
County.
Comments. This species belongs to the subgenus Trichapion;
adults are similar to those of A. reconditum and A. centrale, but they
differ by the strongly convex elytral interstriae and the deeply
impressed striae. Nothing is known of the life history or biolog5', except
that adults are most frequently found in May and June and occur on
black locust (Robinicr pseudoacaclo). The larval host is unknown.
t27