Choragus zimmermanni LeConte

Janicki, Julia & Young, Daniel K., 2017, Nemonychidae and Anthribidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2017 (579), pp. 1-36 : 8

Choragus zimmermanni LeConte

( Fig. 5–6 )

Choragus zimmermanni LeConte 1876: 408 .

Description. Length 1.2–1.3mm (head excluded). Body subcylindrical. Integument light brown to dark brown, without luster; antennae and legs yellow, slightly pubescent. Vestiture consisting of sparse, white to yellow setae. Rostrum flattened, short, dilated, subtruncate apically. Antennal segments 1–3 conical, 4–8 slender, 9–11 forming a loose, setaceous club. Eyes slightly convex, longer than wide, with about 10 rows of facets across. Pronotal width1.6X length, widest at base; surface densely punctate, finely reticulate. Elytral length 1.3X width, 2.0X pronotal length; striae with deep punctures, striae 9–10 complete and separate to elytral apex, 9 th stria angulate above metathoracic sternum; interstriae densely and coarsely granulate, interstria 10 swollen. Pretarsus with claws each possessing a basal tooth.

Diagnosis. Choragus zimmermanni can be recognized by the elytra not having an extra group of punctures near interstria 10, interstria 10 swollen and 9 th stria angulate above the metathoracic sternum, straight pronotal carina, fine pronotal reticulum, granulate interstriae, and by the circular (instead of slit-like) floors of the elytral punctures. This species also tends to be smaller than most other Choragus species , usually around 1.3mm.

Natural history. In general, members of Choragus are associated with pyrenomycete fungi in the families Xylariaceae and Diatrypaceae . This species has been collected from sweet gum ( Liquidambar styraciflua ) in Florida ( Blatchley and Leng 1916) and from basswood ( Tilia americana ) in Wisconsin.

Phenology. In Wisconsin, adults of this species have been collected in July and August.

Collecting methods. The seven specimens examined during this study came from three counties and represent a NEW STATE RECORD. Two specimens were collected in Malaise traps in a Fagus -Acer forest, two from Lindgren funnel traps, one from a flight-intercept trap, one by sweeping, and another by beating branches of live basswood ( Tilia americana ) in a dry-mesic southern forest.

Figures

Figures 5–6. Choragus zimmermanni LeConte. 5) Habitus, lateral view. 6) Habitus, dorsal view. Figures 7–8. Euxenus punctatus LeConte. 7) Habitus, lateral view. 8) Habitus, dorsal view.