380 



REVISION OF THE TENEBKIONID/E OF AMERICA, 



II. viridipennis, Fab., (Diaperis) Syst. El. II, 586, 4; Cut. et Brul^ (Oplocephala) Ann. d. So. Nat. '3:!, 840. 



In this species and the following, the head of the female is entirely devoid of tubercles. 



Length .10-14 inch. 



II. bicornis, Oliv., (Diaperis) Bnt. 3, 55; Enc. Moth. (!, 273; Kirby, (Arrhenoplita) Fauna Boi. A,n. 235; 

 tifittcmt, Cast, et Brulle, (Hoplocephala) loc. cit. p. 841; McornU, Fab., (Hispa) Mant. p. 215. 



This species differs from the preceding in having the whole surface bluish green. The 

 thorax occasionally becomes brownish. 



Length .10-14 inch. 



This and the preceding species arc found rather abundantly over our entire country, 



living in fungi. 



II. chalybea, Cast, et Brulle, Ann. Be. Nat. 23, p. 311. 



"Elongate, punctured, shining, bluish green; head of male with two vertical horns, 



female tuberculate; elytra moderately striate; body beneath blackish; legs brownish. 



Length 4 lines, width 1 j, lines. 



From the neighborhood of Philadelphia." 



Unknown to us. Probably not North American. 



II. collaris, Cast, et Brulle, loc. cit. p. 347. 



"Elongate, punctured, shining, dark ferruginous; head at middle bituberculate, mouth 

 and antenmc brownish; thorax reddish brown, scutellum red; elytra faintly striate, black; 

 with the base, humeri and anterior portion of suture brownish; legs pale ferruginous. 



Length 2^ lines, width 14 lines. 



From the neighborhood of Philadelphia." 



Unknown to us. 



PLATYDEMA, Cast, et BrulU. 



Platydema, Cast, et Brulle, Ann. Be. Nat. 23, p. 850. 



First joint of hind tarsi longer than the two following joints; epipleurse entire; me- 

 sostemum concave ; last joint of maxillary palpi broadly triangular, with the inner and 

 outer sides nearly equal; intercoxal process el' abdomen triangular, acute. 



These characters will serve to distinguish this genus from all those before mentioned 

 and those which follow. 



Our species are numerous and may be distinguished by the following table: 



Head tuberculate or horned; front concave. 

 Polished or shining species. 



Black, broadly oval. e x c a v a t u m . 



Blue, inert; elongate. c y a n e s c e n s . 



Opaque species. e r y t h r o c e r u m . 



