Weevils - Entomological Society of Canada

Specimens of this speqies are also reported in fungus galls and flower
heads of numerous plant species. They have been found hibernating in
cotton bolls and laying eggi on kernels of dry corn. The type material of
this species has been destroyed, and a neotype has not been designated.
The ioncept of the species is based on specimens in the LeConte
collection (MCZ).
Trigonorhinus tomentosus (SaY)
Map 7
Anthribus tomentosus Say, 1826:251 (no type locality given; type
destroyed).
Brachytarsus tomentosus: Blatchley and Leng 1916:40.
B rachytar soides tomerttosas : Pierce 1 930 : 3 1.
Trigonorhinus tomento sus : Valentin e 1957 :9 ; Valentine 1960: 58,
81; Valentine 197 l:246.
Brochytarsus breu is Fahraeus, 1839 : 168 (type, Pennsylvania; NHMP).
Brachytarsus paululus Casey, 1884:194 (holotype, Milford' Del.;
USNM).
Description. Length t.3-2.Lmm (head excluded). Integument of
head, pronotum, and elytra light to dark reddish brown to black'
Pubescence gray and brown, randomly mixed; brown setae sometimes
forming large and diffuse basal, humeral, and median spots. Frons
weakly convex; surface finely punctured, with short, gray, recumbent
scales. Rostrum separated from frons by weak transverse impression
just below level of eyes; surface flat; lateral margins of rostrum weakly
elevated, punctured, and setose as on frons. Pronotum 1.3 times wider
than long, widest at basal angles; sides weakly arcuate, strongly
converging to narrowly rounded anterior margin; disc evenly convex'
weakly transversely impressed before basal carina; surface of disc
shining, with, shallow, irregularly placed, almost obsolete punctures;
interpuncture space finely granulose-punctate; basal carina on disk
acutely elevated, forming a very shallow V Elytra about 1.2 times longer
than wide; sides evenly arcuate to broadly rounded apex; disc evenly
convex; striae narrowly and weakly impressed, with small punctures,
these slightly more deeply impressed than striae; interstriae flat, finely
granulose-punctate, about 4.0 times wider than striae.
Distribution. Ontario, south throughout the United States to
Honduras. Ontario: Arnprior, Belleville, Chatterton, "Fisher Glen,"
Leamington, Marmora, Ottawa, Roseland, Simcoe, and Tillsonburg.
Comments. This is a variable, abundant species that oviposits in the
male flowers of the common ragweed (Ambrosia species). A number of
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