Synolabus bipustulatus (Fabricius)

Young, Julia Janicki Daniel K., 2021, Survey of the Attelabidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2021 (891), pp. 1-61 : 4-5

Synolabus bipustulatus (Fabricius)

( Fig. 1–2 )

Diagnosis. Synolabus bipustulatus can be distinguished by the black integument with red markings extending from the base to the middle of the elytra.

Description. Length 2.2–4.5mm. Body glabrous, ventral surface with few scattered setae. Integument black, elytra black with reddish orange rectangular markings, these extending from base to middle of elytra, laterally to interstria 2 or 3. Head arcuate laterally from base to eyes; surface smooth, with few very small, widely separated, shallow, minute punctures and with 2 deeply impressed, arcuate grooves along each eye; median area impressed from antennal insertion to above upper level of eyes. Rostrum distinctly shorter than head; surface densely punctured, rugose; lateral angles lacking conspicuous tooth apically; submental area in males with conspicuous median tooth, in females with swelling. Antennae inserted dorsolaterally near base of rostrum. Pronotal width 1.4× length, widest at base; arcuate laterally, converging to recurved apical margin; disc evenly convex, with numerous minute, impressed punctures, interpuncture space smooth and shining. Elytral width at base 1.3–1.4× pronotal width, broadly rounded apically; striae not impressed, with large, shallowly impressed punctures in regular rows; interstriae 3.0–4.0× strial width, with scattered, very minute punctures. Prothoracic femora of male armed with 1–2 blunt spine-like projections, of female unarmed or armed with 1 peg-like projection.

Natural history. This species has been recorded from oak ( Quercus spp. ), alder ( Alnus Ehrhart spp. ), hop hornbeam ( Ostrya Scopoli spp. ), musclewood ( Carpinus caroliniana Walter ), shagbark hickory ( Carya ovata (Miller) K. Koch ), black locust ( Robinia pseudoacacia Linnaeus ), as well as goldenrod ( Solidago Linnaeus spp. ) and Rubus Linnaeus species in Wisconsin. Murtfeldt (1872) and Girault (1904) provided further details on this species.

Phenology. In Wisconsin, adults of this species have been collected from May to August, with a peak in June and July.

Collecting methods. The 25 specimens examined during this study were most often collected by hand from scrub oak or by beating other oak species. Several specimens were collected from Quercus ellipsoidalis E. J. Hill. Other specimens were collected from Malaise traps, flight intercept traps, Lindgren funnel traps and yellow van traps.

Distribution. United States. AL, AR, CT, DC, FL, GA, IL, IN, KY, LA, MA, MD, ME, MI, MO, NC, NH, NJ,

NY, OH, OK, PA, RI, SC, TN, TX, VA, WI, WV. Canada. NS, ON, PQ.

Wisconsin county records. This species has previously been recorded from Wisconsin ( Blatchley and Leng 1916; O’Brien and Wibmer 1982; Downie and Arnett 1996). Adams, Columbia, Jackson, Marquette, Monroe, Sauk, Shawano, Waupaca, Waushara, Wood.

Figures

Figures 1–2. Synolabus bipustulatus (Fabricius). 1) Habitus, dorsal view. 2) Habitus, lateral view.