13 



Body glossy, underneath black, above blaok-bronzed ; mandibles, palpi, 

 scape of antennae and legs rufous, or rather pale chestnut ; frontal impressions 

 rather wide ; prothorax truncato-obcordate, with a basilar furrow on each 

 side and a few punctures at the posterior angles; elytra lightly furrowed, with 

 punctures in the furrows ; two punctiform impressions in the usual situation, 

 one a little beyond the middle of the elytrum, adjacent to the second furrow, 

 and the posterior one near the apex adjacent to the third. 



Variety B. Black above, with the whole antennae rufous, elytra piceous; 

 perhaps an immature specimen. 



39. Argutor [Pterosticiius] BREVicoRNis, Ztr&y. Plate viii. fig. 3. — 

 Length of body 3 lines. Taken in lat, 65°. 



This with the preceding species, in the shape of the prothorax, which 

 is obcordate, departs a little from the others. A. brevicornis resembles 

 A. mandibularis in many respects, but the body is black, as are also the 

 mandibles and palpi; the antennae of the male are shorter, and those of the 

 female not longer, than the prothorax ; one of these organs in the latter sex, 

 in the only 9 specimen taken, appears to have been affected by some 

 disease, for the two last joints are larger than the preceding ones, so as to 

 form a kind of knob; it is the right-hand antenna that is so circumstanced ; 

 the little furrows at the base of the prothorax are wider than in A. mandi- 

 bularis; the elytra of the % have three, and those of the J four, punctiform 

 impressions, all adjacent to the third furrow. The last eight joints of the 

 antennae in this species have less down and shine more than is usual with 

 the ground beetles in general. 



[LeConte, in his list, asks whether this species may not be equivalent to 

 P. fastidiosus. Mann.] 



[32] 40. Omaseus [Pterostichus] ortnomum, Leach. — Length of 

 body 5J lines. Taken frequently in lat. 64^ and 65°. 



Body oblong, glossy, black. Head rather ovate, underneath, in some 

 specimens, chestnut, in others black; palpi piceous; prothorax subcordate, 

 rather longer than wide; a deep, punctured, basilar impression on each side; 

 posterior margin slightly sinuate ; elytra subacurainate, lightly furrowed with 

 from four to six largish impressions in the isecond and third furrows, the -first 

 usually being in the third and the second on the second furrow, but the 

 others occasionally varying; the natural number of these impressions seems 

 to be five ; legs black, with piceous tarsi. 

 Varieti/ B. Legs chestnut. 



C. Tibiee and tarsi chestnut. 



From the number of specimens collected in the expedition, I should con- 

 jecture this to be one of the most common of North American ins'^cts. It 



