Weevils - Entomological Society of Canada

Trigoruorhinus sticticus : Valentine 1957 :9 ; Valentine 1960 : 58, 81 ;
Valentine l97L:247.
Anthribus uariegatus Say, 1826:251 (name preoccupied) (no type
locality given; type destroyed).
Brachytarsus obsoletus Fahraeus, 1839:167 (type, Pennsylvania;
NHMP).
Description. Length 1.8-3.2 mm (head excluded). Integument of
head, pronotum, and elytra mottled black and reddish brown.
Pubescence tricolored, composed of white, light brown, and very dark
brown setae, arranged as follows: pronotum with dark brown setae
predominant on basal area and white or light brown setae predominant
on anterior portion. Elytra with scattered light brown setae intermixed
with white setae; posterior and lateral portions sometimes with
scattered spots of dark brown setae surrounded by white setae in
irregular pattern; interstriae 1-4 with 1 large or 2 connected dark
brown spots on basal portion and 2 dark spots on median portion;
median spots sometimes connected by dark setae on interstriaet and2.
Frons weakly convex, transversely impressed below eye level; surface
finely punctured. Rostrum moderately prolonged; surface as on frons.
Pronotum very slightly wider than long, widest just behind middle; sides
distinctly arcuate, converging to narrowly rounded anterior margin;
disc evenly convex, with narrow transverse impression just before basal
carina; surface shining, with obscure, shallow punctures; interpuncture
space minutely punctured or reticulate; basal carina weakly arcuate,
acutely elevated. Elytra about l-.3 times longer than wide; sides evenly
and slightly arcuate to broadly rounded apex; disc evenly convex; striae
weakly impressed, with large, obscure, more deeply impressed
punctures; interstriae I.0-2.0 times wider than striae, minutely
punctured.
Distribution. Quebec to British Columbia, and Northwest
Territories south through the United States to California and Utah in
the west and to Iowa and Florida in the east. British Columbia: 5 km
south of Vernon. Manitoba: Boissevain. Northwest Territories: Fort
Simpson (not on map). Ontario: Brittania, Chatham, Constance Bay,
Delhi, Forestville, Leamington, Madoc, Marmora, Ottawa, Pelee Island,
Rondeau Park, Tilbury Toronto, Turkey Point, "Victoria," and
Walsingham. Quebec: Covey Hill, Gatineau Park, Hull, Laniel, and
Wakefreld. Saskatchewan: Elbow, Greenbush (not on map), Hudson Bay,
and Prince Albert.
Comments. This is probably the most common species of this
genus in Canada. Adults are readily recognized by the color pattern
described above. Nothing is known of the life history or habits of the
species, except that it breeds in smut fungr, especially on corn, wheat,
and wild grasses (Andropogon species).
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