478 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



and 7th interspaces interrupted by two or three punctures in the pos- 

 terior third of the length ; on the 3d interspace there is also a puncture 

 on the left elytron one-fifth from the base. Length 12.5™'^ (0.5 inch). 



Leavenworth Valley, above Georgetown, Colo.; altitude, 9,000 to 

 10,000 feet; Mr. Bowditch; one specimen, with legs and antennae muti- 

 lated. 



5, N. TKI]?AItIA, n. sp. 



Elongate, slender, black. Head with eyes scarcely narrower than pro- 

 thorax, the latter one-half wider than long, rounded on the sides before 

 the middle, then narrowed and strongly sinuate; hind angles rectan- 

 gular, prominent; side-margin not narrow, strongly reflexed; trans- 

 verse impressions and dorsal line deep, base punctulate, basal impres- 

 sions deep. Elytra elongate-oval, humeri well-rounded, not prominent ; 

 striae deep, im punctured ; 3d, 5th, and 7th interrupted with large punc- 

 tures, which vary in number from four to five, distributed to within one- 

 third or one-fourth of the length from the base. Length 13'"'" (0.52 inch). 



American Fork Caiion, Utah; 9,500 feet altitude; Mr. Bowditch. 

 This species resembles in form W. gregaria, but the si des of the thorax 

 are more strongly margined and more sinuate towards the base. The 

 punctures of the elytra are larger, so as to interrupt the interspaces, 

 and the color is not piceous in tint, but full black : the outline is less 

 slender, though not as stout as in N. metallica. 



IL N. LONGULA, 71. Sp. 



Elongate, slender, shining black, with a piceous reflection. Prothorax 

 nearly twice as wide as long, rounded on the sides and strongly mar- 

 gined, narrowed behind ; basal angles obtuse, not at all rounded. Elytra 

 elongate, slightly wider behind, subtruncate at base, humeri rounded, 

 basal fold not forming a distinct angle with the margin ; striae fine, 

 impunctured, interspaces flat, 3d with three dorsal punctures adjacent 

 to the 3d stria. Prosternum flattened and finely margined at the tip. 

 Legs black. Length 9""" (0.36 inch). 



Colorado ; locality unknown ; one specimen, given me by Mr. Ulke. 

 This is very closely allied to JT. sutiiralis, and differs from that species 

 only by the legs being black and the elytral strise finer. Large series 

 from more varied localities will perhaps show that it is to be considered 

 more properly as a race of that insect. 



12. N. OBLiQUA, Lee. 



i^orth Fork of South Platte Canon (7,000 to 8,000 feet); Mr. Bowditch. 



13. N. OBTUSA, n. sp. 



Elongate, slender, piceous-black, shining, palpi, antennae, and legs 

 pale. Head, with the eyes, narrower than the prothorax, eyes convex, 

 somewhat prominent. Prothorax nearly twice as wide as long, sides 

 much rounded in front of the middle, obliquely narrowed and not sinu- 



