LECONTE ON ROCKY MOUNTAIN COLEOPTEEA. 477 



Group YI i—jjallijjes. 



The color is black, with the antennae, palpi, and legs j'ellow- testa- 

 ceous. Prothorax strongly narrowed behind, basal angles obtuse, side- 

 margin widely reflexed. Elytra subtruncate at base, basal fold meeting 

 the side-margin in a distinct angle: humeri rounded, sides slightly 

 rounded ; stride deep, less impressed at the sides and tip ; dorsal punc- 

 tures four or five, situated on the 3d stria. Presternum flattened at tip, 

 and strongly margined; setigerous punctures of ventral segments in a 

 single row each side. 



23. N.pallipes is found on the Atlantic slope near streams, in hilly or 

 mountainous regions, from Nova Scotia to Minnesota, and southward to 

 Virginia. Three well-marked races are known to me : — 



1. Elytra distinctly subtruncate at base; strise deep; wings well devel- 

 oped : — this is the usual form. 



2. Elytra distinctly subtruncate at base ; striae less deep, obliterated 

 at sides and tip ; wings well developed. Minnesota. 



3. Elytra more rounded at base, narrower and more convex ; strisB 

 deep, obliterated at sides and tip; wings wanting. Nova Scotia. 



3. N. OVIPENNIS, n. sp. 



Apterous, shining brownish black ; head with the eyes narrower than 

 the prothorax; frontal impressions obsolete; antennae extending to 

 about one-fourth the length of the elytra. Prothorax wider than long, 

 sides strongly rounded in front, then sinuate to the base, which is much 

 narrowed, and slightly emarginate; side-margin feebly punctulate, 

 strongly reflexed, hind angles rectangular; impressions and dorsal line 

 deep, base feebly punctulate. Elytra regularly oval, scarcely wider than 

 the widest part of the prothorax, less elongate than in JV". ingens ; striae 

 deep, slightly punctulate, 3d interspace with three dorsal punctures, 7th 

 interspace with two, the posterior of which is about the middle of the 

 length; presternum flattened at tip, slightly declivous, not margined. 

 Length 11.5""° (0.45 inch). 



One S . Sierra Nevada, Cal. Less elongate than iV. ingens, and 

 differs by the wider prothoracic side margin and flattened and broader 

 prosterual tip. 



4. N. PURPURATA, n. sp. 



Elongate, as slender as N. gregaria, black, elytra purple, but without 

 metallic gloss. Head with the eyes scarcely narrower than the pro- 

 thorax. Prothorax wider than long, rounded on the sides before the 

 middle, then narrowed, and not very suddenly sinnate ; hind angles 

 rectangular, prominent, side-margin not narrow, strongly reflexed; all 

 the impressions are deep, and the disc each side of the median line has 

 a large deep puncture, which is probably accidental. Elytra elongate- 

 oval, but little wider than the widest part of the prothorax; humeri 

 well-rounded, not iDrominent; striae deep, feebly punctured; 3d, 5th, 



