Weevils - Entomological Society of Canada

scales on base; surface shining or moderately to densely alutaceous to
near tip. Rostrum of female finely alutaceous distal to antennal
insertion, with scales distinctly finer than those on base. Antennae
inserted in front ofeye at distance less than length ofeye. Pronotum at
base about 1.1 times wider than long, slightly wider at base; sides
arcuate, rounded to constricted apex; disc slightly convex, with deep
punctures bearing narrow scales; interpuncture spaces frnely
alutaceous. Elytra about 1.3 times longer than wide; striae moderately
deep; interstriae about twice as wide as striae, convex to nearly flat,
mostly very finely reticulate, each interstria with a few fine scales. Legs
of male lacking specialized characters.
Distribution. Ontario and Quebec, south through the
northeastern United States. Ontario: Arnprior, Constance Bay, Ottawa,
Prince Edward County, and Rainy River District. Quebec: Aylmer.
Comments. This species is one of two in Canada that belong to
the subgenu s Ixapion. Adults of A. idiastes are distinguished from those
of the other species, A. frosti, by the small but distinct punctures on the
rostrum (the rostrum of A. frosti is impunctate) and by the less
abundant scales on the posterior portion of the metepisternum. Other
characters useful for distinguishing the two species are summarized in
the key. Nothing is known of the biolory or life history of this species
except for the host plant, withe-rod (Viburnum cassinoides).
Apion impeditum Fall
Figs.53,102,103
Apion impeditum Fall, 1898:113 (Iectotype, Peekskill, N.Y.; MCZ'):
Kissinger 1968:138; O'Brien and Wibmer 1982:24.
Description. Length L.8-2.2 mm. Body slender, black; legs and
antennae reddish brown. Pubescence consisting ofwhite, sparse, very
fine setae. Frons 1.0-1.2 times wider than dorsal tip of rostrum.
Rostrum of male moderately curved, 1.3 times longer than pronotum;
sides, in dorsal view, nearly parallel in apical half, slightly expanded at
antennal insertion, slightly expanded toward apex; basal two-thirds
coarsely alutaceous, the tip smoother with small punctures. Rostrum of
female moderately curved, 1.4-1.6 times longer than pronotum; otherwise
similar to male, except tip smoother with fine punctures. Antennae
inserted between basal 0.2 and 0.3 of rostrum. Eyes moderately convex.
Pronotum at base 1.0-1.1 times wider than long; sides nearly parallel
throughout, slightly constricted at apex; disc slightly convex, with deep
punctures bearing fine scales; interpuncture spaces alutaceous. Elytra
1.5-1.6 times longer than wide; striae deep, moderately finely punctured;
Lt7