Eurymycter tricarinatus Pierce

Janicki, Julia & Young, Daniel K., 2017, Nemonychidae and Anthribidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2017 (579), pp. 1-36 : 25

Eurymycter tricarinatus Pierce

(Fig. 39–40)

Eurymycter tricarinatus Pierce 1930: 18 .

Tropideres tricarinatus (Pierce) ; Valentine 1960: 70.

Description. Length 5.2–7.5 mm (head excluded). Integument dark brown. Vestiture of pronotum consisting of small, light brown setae, with scattered, small, white or yellow setal patches; elytral vestiture consisting of light brown setae, apical 1/2 with distinct transverse band of white setae, apex with brown setae; setae on metathoracic tibiae each forming a single, pale, narrow median band. Rostrum prolonged, flattened, with three carinae, two lateral carinae distinctly elevated; surface concealed by dense, white, recumbent setae, brown apically. Pronotal width 1.3X length, widest behind middle; sides angulate basally, converging toward broadly rounded apex, broadly emarginate basally; transverse carina antebasal, strongly elevated; lateral carina acute, strongly elevated; surface irregular, with medial, narrow, deeply impressed W-shaped groove; disc with various weak elevations and distinct, strong punctures or small impressions laterally, surface shining, with dense minute punctures. Elytral length 1.4X width, broadly rounded apically; striae indistinct, with large, shallow punctures that are much deeper behind base; interstriae 3, 5 and 7 weakly elevated, the elevations smooth on summit; base of 3 rd interstria slightly elevated. Abdomen with venter with brown setae in center, white or grey laterally. Pygidium vertical, narrowly rounded apically in both sexes.

Diagnosis. Eurymycter tricarinatus is most similar to E. fasciatus . It can be distinguished by the abdominal pubescence that is brown at the center and grey or white laterally, and by the vestiture of the metathoracic tibiae, each having setae forming one pale, medial band, as opposed to two. It can be distinguished from G. gibbosus by the absence of a large, white setal patch basally on the elytra.

Natural history. This species is commonly found under bark of decaying wood, as it is associated with fungi on woody plants. In Wisconsin, it has been recorded from a variety of habitats, including mixed hardwood forests, old growth northern mesic forests, oak pine barrens, oak pine forests, and dry lime prairies.

Phenology. In Wisconsin, adults have been collected from May – September.

Collecting methods. In Wisconsin, 28 specimens were examined during this study from 13 counties. This species is most frequently collected with the Malaise trap, as more than half of the Wisconsin specimens were collected this way. Adults have also been collected by hand, in flight intercept traps, and in Lindgren funnel traps.