Calognathus chevrolati chevrolati Guérin-Méneville 1836
Calognathus chevrolati is a black tenebrionid with pale scale-like setae covering some areas. The pronotum is broader than long and the head is nearly as large as the pronotum. The tarsi are compressed laterally and have long setae forming sand-shoes for digging. Males have the long, slender, anteriorly projecting mandibles. There are 4 subspecies described.
Calognathus chevrolati chevrolati:
Mandibles of males strong and angularly arcuate, with strong and long basal crest. Pronotum more than twice as wide as long, basal margin doubly arcuate. Elytra almost as wide as long, cordiform, strongly deplanate. The entire dorsum of the head with the exception of the clypeal margin, as well as entire disc of pronotum, densely covered with scale-like hairs; pubescence bicoloured: whitish behind clypeal margin and lateral parts of pronotum, brown on vertex and median part of pronotum, A broad lateral band and broad sutural margin of elytra with similar pubescence to that of head and pronotum, in whitish to light brown colour. A narrow, almost rectilinear V-shaped area of each elytron either completely bare (males), or brown pubescent and only apically bare and black (females).
Distribution: north and south of the Orange river.
Description and illustration in:
Koch, C. 1950. The Tenebrionidae of Southern Africa. I. First account of the Tenebrionidae collected on the University of California-Transvaal Museum Expedition, 1948. Annals of the Transvaal Museum, 21
https://journals.co.za/doi/pdf/10.10520/AJA00411752_442
https://journals.co.za/doi/pdf/10.10520/AJA00411752_1051
iNat observation: https://www.inaturalist.org/observations/188002707
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