4G2 CoJeoptey^ological Notices. 



about two-tliirds wider than the head and five-sixths wider than long ; sides 

 feebly convergent from base to apex, strongly and almost evenly arcnate ; base 

 broadly, feebly arcuate, feebly sinuate laterally ; basal angles acute and a 

 little less posteriorly prominent than the middle ; apex truncate between the 

 slightly advanced acute angles ; disk widest slightly behind the middle, 

 transversely convex, very abruptly and conspicuously, although somewhat 

 narrowly explauate along the sides, punctured like tlie head. Scutellum 

 dull, granulose, sjjarsely punctate. Elytra scarcely thi'ee-fourths longer than 

 wide, rather inflated behind, three times as long as, and distinctly wider than, 

 the prothorax, having deep abrupt deeply punctate grooves, the punctures of 

 the grooves separated by nearly their own diameters : intervals flat, scabrous, 

 asperately punctate, and distinctly wider than the grooves, the erect scales 

 numerous, unevenly arranged. Abdomen finely granulose and but feebly shin- 

 ing, rather coarsely and densely punctate, somewhat densely covered with 

 robust recumbent yellowish-cinereous hairs which are conspicuous. 



Male. — Anterior tarsi scarcely perceptibly dilated ; abdominal impression 

 broad and nearly flat. 



Length 5.1— G.O mm. ; width 2.3-2.7 mm. 



« 



Arizona. 



Although allied to sulcata^ this species is very easily separated 

 by its much more robust form, more transverse prothorax, wider 

 elytral intervals, shorter darker' more erect and much less conspicu- 

 ous vestiture of the upper surface and more robust denser and more 

 distinct pubescence of the abdomen, the latter being duller and more 

 densely punctate. The explanate lateral portion of the pronotuni 

 is much wider in the present species and almost perfectly flat. 



44 B. discolor Horn.— Trans. Am. Phil. Soc, XIV, p. 354. 



I have not seen the unique type of this species, but from the 

 description it would appear as if it were not correctly placed in 

 Blapstinus Its coloration is absolutely foreign to this genus, 

 although quite common in the apterous genera allied to Conibius; 

 its glabrous surface is also a very exceptional character especially 

 among the Califoruian species of Blapstinus. It is probable that 

 discolor is apterous, and that it will prove to be a member either 

 of Conibius or of an allied genus. 



MECYSMUS Horn. 



The species of this genus &.vv not very numerous and somewhat 

 resemble the more elongate and depressed forms of ]5Iapstinus such 



1 An immersion for three hours in pure ctbylic ether does not all'ect the 

 coloi' of the vestiture, showing tliat tliis is not due to any fatty exudation. 



