HEMICBEPIMUS. 479 



d 5 . Antennse more slender and more elongate in the male. 



c\ Hind angles of the prothorax greatly produced and strongly- 

 divergent longicornis. 



d\ Hind angles of the prothorax moderately produced and much 



less divergent nitidus. 



d" 1 . Pubescence closer and coarser. 



e\ Prothorax rufous, with a black median vitta, which is sometimes 

 divided or constricted at the centre, and with two large patches of 

 coarse pallid pubescence on either side, leaving a large cruciform 

 space more finely pubescent, the hind angles greatly produced and 



divergent ; elytra black cruciatus. 



/*. Prothorax with a large cruciform black patch (except in H. biformis, 

 2 ), for the rest ferruginous or rufous (the sides partly flavous in 

 H. pictipes) ; the pubescence uniform and partaking or not of the 

 ground-colour. 

 e 5 . Hind angles of the prothorax greatly produced and strongly 

 divergent, the base with a distinct incisure on either side ; elytra 

 very rugose ; body similarly coloured in the two sexes .... pictipes. 

 f 5 . Hind angles of the prothorax moderately produced and much less 

 divergent, the base without distinct incisures j elytra smoother ; 

 body dissimilarly coloured in the two sexes biformis. 



1. Hemicrepidius carbonatus. 



Asaphes carbonatus, Leo. Proc. Acad. Phil. 1860, p. 320 l ; Cand. Monogr. Elat. iv. p. 214, t. 3. 



fig. 2 2 ; Horn, Trans. Am. Ent. Soc. viii. p. 71 3 . 

 2 . Asaphes coracinus, Cand. loc. cit. 4 



Hal. North America, Hudson's Bay 2 , Oregon 14 , Nebraska 3 , California 34 . — Mexico, 

 Ciudad in Durarjgo 8100 feet (Forrer, H'oge). 



Four specimens. This is the only one of our species with the second and third 

 tarsal joints distinctly lamellate. The insect is very like //. hirtus (Cand.), from 

 California, but is clothed with shorter hairs. 



2. Hemicrepidius aterrimus. 



Elongate, very narrow, moderately shining, deep black, sparsely and finely pubescent, the pubescence blackish 

 above and cinereous beneath. Head thickly punctured, transversely depressed in front ; the front limited 

 on either side anteriorly by an oblique ridge, which extends downwards and meets the opposite one in the 

 centre slightly above the anterior margin of the head ; antenna) moderately elongate, extending fully two 

 joints beyond the hind angles of the prothorax, joint 3 a little longer than 2. Prothorax much longer 

 than broad, slightly narrowing from the middle forwards, and feebly sinuate at the sides behind ; the 

 hind angles moderately produced, divergent, not carinate ; the surface closely and finely punctate. 

 Scutellum thickly punctured, and with indications of a smooth median line. Elytra two and three-fourths 

 longer than the prothorax, and much wider than it, subparallel to the middle and gradually narrowing 

 bej'ond, subtruncate at the apex; deeply punctate-striate, the interstices slightly convex and transvei'sely 



