M.3.] LE CONTE ON EOCKY MOUNTAIN COLEOPTEEA. 511 



the sinuation is very slight. It is possibly a distinct species allied to 

 the European alpinum, but I am unwilling to base a description upon a 

 single specimen without farther comparisons. 



PsEUDOPSiS OBLITERATA. — Depressed, piceous opaque. Head with- 

 out elevations. Prothorax transversely oval, sides broadly iiatteiied, 

 disc with four slightly elevated ill-defined costae. Elytra with two ob- 

 solete discoidal costas, and a more distinct submarginal one ; margin 

 acute. Abdomen paler at tijD. Antennae and legs ferruginous. 

 Length, 2"^°^. 



La Yeta, Colo. ; rare. I found also one specimen in the Gila Valley 

 in 1851. 



Hydnobius longidens. — Elongate-oval, convex, dark rufo-testace- 

 ous shining, head finely sparsely punctured, i)rothorax more distinctl}^ 

 punctured, finely margined at the base. Elytra punctured in slightly 

 confused rows, sutural stria impressed. Length, 2.5™™. 



(? Hind thighs with a large acute compressed tooth, the distal margin 

 of w^hich runs perpendicularly from the knee joint. 



Garland ; one ^ . There is no specific dili'erence in form, color or sculp- 

 ture between this and the following species, except in the position of 

 the tooth of the hind femora, and I have therefore confined myself to 

 that character to prevent needless repetition. 



Hydnobius curvidens. — Hind thighs of the c? with a large com- 

 pressed tooth about one-third from the distal end ; the outer margin of 

 which forms a concave arc of a circle to the knee joint. Length, 2.2™™. 



La Yeta, Colo. 5 one <? . 



Hydnobius pumilus. — IMuch smaller, testaceous, elytra more finely 

 punctured than usual, and with extremely fine distant transverse lines. 

 Hind thighs of the ^ broadly and obtusely dilated near the tip ; the 

 distal margin of the tooth thus formed is oblique, and the apex is 

 slightly cuspidate. Length, 1.2-1.5™™. 



Yeta Pass, Colo. ; one S . San Mateo, Cal. ; one 9 . The punctures 

 of the elytra are smaller than usual, and nearly obliterated towards 

 the tip. 



Hydnobius obtusus. — Dark rufo-testaceous, shining, elytra as usual 

 with striss of large punctures ; punctures of interspaces smaller and 

 less numerous. Hind thighs of $ broader and more compressed than 

 in the 9 , not toothed, but only obtusely rounded on the lower margin. 

 Length, 2.5™™. 



Garland, Colo. ; both sexes ; occurs also in British Columbia. 



The Ibllowing species are extra-limital. 



Hydnobius longulus. — More elongate than the others, oval, con- 

 vex, rufo-testaceous, shining, elytra with the striae composed of smaller 



