Eugnamptus puncticeps LeConte

Young, Julia Janicki Daniel K., 2021, Survey of the Attelabidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2021 (891), pp. 1-61 : 14-15

Eugnamptus puncticeps LeConte

( Fig. 13–14 )

Diagnosis. Eugnamptus puncticeps can be recognized by the head with numerous, dense setigerous punctures, by the elytra that are never dark, and by the males and females that are of approximately the same size, a character that distinguishes this species from the rest of the genus. According to LeConte (1876), the antennae are also stouter than those of E. angustatus .

Description. Length 3.0–4.0mm (head excluded). Integument reddish brown to yellowish to brown throughout, with variable dark areas on the rostrum and the distal part of the appendages. Head slightly longer than wide, with numerous, rather dense setigerous punctures. Rostrum length 1.25× length of head, slightly wider than frons apically. Frons slightly convex, sometimes with weak median linear impression, wider than rostral base. Antennae inserted slightly behind middle of rostrum; club short, much shorter than funicle, apical segment slightly longer than penultimate segment. Pronotum as wide as long, slightly wider than distance across eyes, with dense, setigerous punctures subequal to those of head; nearly parallel-sided, narrowed only slightly basally and apically, dorsal surface weakly flattened, sometimes with weak, mid-dorsal impression behind middle. Elytral length about 3.0× pronotal length, width <2.0× pronotal width at base, widening only slightly near apical 2/3; striae round to quadrate, moderately impressed; interstriae weakly convex, as wide as or slightly wider than striae, punctures very small, <0.25× those of striae. Sexual dimorphism present, exhibiting all sexual dimorphism of the genus except eyes of males and females are approximately the same size.

Natural history. According to Hamilton (1990), this species has only been collected on dwarf sumac ( R. copallina ), mostly in June, July and August. Among the Wisconsin specimens, a series of this species was reported on smooth sumac ( Rhus glabra Linnaeus ): “very active, on tips of leaflets of Rhus glabra , excavating lower surface, leaving circular scars visible above and below, upper epidermis undamaged, limy hill prairie, 5 pm, cloudy, 74F” (label data from vouchered specimen series in WIRC; A. Williams collector). A specimen was collected by “sweeping bluff prairie”, and another by “sweeping prairie/savannah”. This species is wide ranging but apparently not locally abundant ( Hamilton 1990).

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

Collecting methods. The nine Wisconsin specimens examined during this study from four counties represent a new state record (Appendix 1). This species can be most readily collected by hand from smooth sumac ( R. glabra ) or dwarf sumac ( R. copallina ) or by sweeping prairie habitats where its plant associations are found. It has can also be collected at UV light.

Distribution. United States. AL, CT, DC, FL, GA, IA, IL, IN, KS, LA, MA, MD, MO, MS, NC, NE, NJ, PA, SC, TN, TX, VA, WI.

Wisconsin county records. Crawford, Grant, Iowa, Vernon.

Figures

Figures 13–14. Eugnamptus puncticens LeConte. 13) Habitus, dorsal view. 14) Habitus, lateral view.