Temnocerus cyanellus (LeConte)

Young, Julia Janicki Daniel K., 2021, Survey of the Attelabidae of Wisconsin (Coleoptera: Curculionoidea), Insecta Mundi 2021 (891), pp. 1-61 : 20-22

Temnocerus cyanellus (LeConte)

( Fig. 21–22 )

Diagnosis. Temnocerus cyanellus can be recognized by the unexposed pygidium, by the rostrum that enlarges abruptly in the apical ¼, by the strongly protuberant eyes, and by the distinctly wider than long pronotum that narrows apically.

Description. Length of male 2.4–3.4 mm, of female 2.3–2.5 mm. Integument black with bluish, aeneus and purple reflections, antennae and extremities of legs somewhat paler. Head quadrate, with dense, round, setiferous punctures; interpuncture space minutely granulose, becoming longitudinally rugose in front. Rostrum enlarged rather abruptly in apical ¼ to a width subequal to frons; sides in dorsal view nearly parallel; slightly arcuate; in male length about 1.0× pronotal length, in female 1.6× pronotal length. Frons with interspaces minutely rugose. Eyes rather strongly protuberant. Antennae inserted further from rostral base, insertion to antennal margin of eye much greater than diameter of eye; in male inserted between basal ½ and ¼ of rostrum, in female inserted at basal 1/3 of rostrum. Pronotum distinctly wider than long, narrowed apically, widest behind middle; disc with round, shallow setiferous punctures, interpuncture space finely grooved. Elytral length 3.0× pronotal length, width 2.0× pronotal width; striae not impressed, with deep, quadrate to oval punctures; interstriae about 0.5× strial width, each interstria with 1 row of fine, round, setiferous punctures. Pygidium covered by elytra. Sexual dimorphism present in size, rostrum and antennal insertion.

Natural history. This species has been collected from willow ( Salix spp. ), birch ( Betula Linnaeus spp. ) and oak ( Quercus spp. ).

Phenology. In Wisconsin, adults have been collected in May and June.

Collecting methods. Seven Wisconsin specimens were examined from four counties. This species has been collected by beating branches of hardwood trees.

Distribution. United States. AB, CO, CT, IA, IL, IN, MA, ME, MI, MN, MO, MT, NB, NE, NH, NJ, NY, OH, OR, PA, UT, WI. Canada. MB, NF, NS, ON, PE, PQ, SK.

Wisconsin county records. This species was previously recorded from Bayfield County ( Hamilton 1971; O’Brien and Wibmer 1982; Downie and Arnett 1996). Bayfield, Dane, Dodge, Portage.

Figures

Figures 21–22. Temnocerus cyanellus (LeConte). 21) Habitus, dorsal view. 22) Habitus, lateral view.