Euceratocerus, LECONTE, 1874

Hinson, Kevin R., 2021, Updated Key to the North American Species of Euceratocerus LeConte, with a New State Record for Euceratocerus gibbifrons White (Coleoptera: Ptinidae) from North Carolina, USA, The Coleopterists Bulletin 75 (3), pp. 587-593 : 591

KEY TO THE NORTH AMERICAN SPECIES OF EUCERATOCERUS LECONTE

As a corrected key has not been published, anyone using the key in White (1966) without reading White (1974) will misidentify specimens and generate confusion regarding the biology of Euceratocerus species. I have therefore created an updated key to Euceratocerus that has been modified from White (1966) following suggestions in White (1974).The dorsal illustration of E. argenteus ( Fig. 18 ) is from White (1975), and illustrations of male antennae of the remaining three species ( Fig. 10 ) are from White (1974). Illustrations of the antennae of female E. gibbifrons and E. hornii ( Fig. 11 ) are from Fall (1905) and White (1971), respectively. I have updated the range of E. gibbifrons to include Kentucky, North Carolina, and Oklahoma and have also suggested that E. gibbifrons probably occurs throughout much of the eastern United States. Given ranges should be used cautiously to assist with identification when specimens occur in or near Texas. The Results and Discussion section should be read prior to use of this key to understand the complex and tentative definitions of E. gibbifrons and E. hornii and their ranges.

1. Elytra without distinct striae. First abdominal suture posteriorly arcuate. Tarsi short compared to length of tibiae. Dorsum covered in silvery pubescence when viewed under bright light; Mexico (Sinaloa) ( Fig. 18 ) ...... ....................................... E. ARGeNTeUS White

Figures

Fig. 18. Dorsal habitus illustration of Euceratocerus argenteus (modified from White 1975).

Fig. 10. Antennae of all male Euceratocerus species from the United States (modified from White 1974).

Fig. 11. Illustrations of antennae of female Euceratocerus gibbifrons and female E. hornii [modified from Fall (1905) and White (1971), respectively].