ClCINDELIDyE AND CARABID/E 89 



25 Form moderately stout, rather convex, the side margins narrow; 

 head very moderate in size, the mandibles rather small, partially 

 strigilate, the labrum as in acuminates and the two following; 

 impressions moderate; prothorax a little more than one-half wider 

 than long, the base evidently but not at all pronouncedly narrower 

 than the apex, the grooves entire, uniting at the sharply right angles, 

 the impressions deep, linear; elytra equal in width to the prothorax, 

 fully two-fifths longer than wide, moderately acuminate at tip, 

 very narrowly margined; surface with widely spaced and slightly im- 

 pressed single striae of distinct punctures, with a strong lateral ridge 

 in prolongation of the humeral carina and another near and im- 

 mediately exterior to it equally pronounced, both extending to the 

 apical declivity, also, just within the principal ridge, a wide and feeble 

 ridge separating the two outer dorsal series of punctures, which are 

 irregularly somewhat geminate. Length 22.0 mm.; width 8.5 mm. 

 Colorado obsoletus Lee. 



Form stouter, similarly black, shining, with very narrow side margins 

 and evidently larger head, the mandibles moderate and having only a 

 few strigae; labrum similar; impressions broader and deeper; an- 

 tennae notably more elongate; prothorax still more transverse, 

 three-fifths wider than long, the grooves nearly similar, the impres- 

 sions short, linear and deep, the small juxtangular impression deep, 

 wholly disconnected from the median pair as in obsoletus; elytra 

 broader, convex, smooth and even, having very faint and widely 

 spaced single series of obsolescent punctures, which become geminate 

 laterally and having barely a trace of the strong lateral ridges of 

 obsoletus; in some specimens even these vestigial series of punctures 

 are wholly invisible, the surface very smooth and even throughout. 

 Length 22.5 mm.; width 8.8-9.0 mm. New Mexico, F. H. Snow; 

 Texas (El Paso Dunn and Marfa Wickham). . . vestigialis n. sp. 



Form more elongate, much larger in size, the head still larger, the side 

 margins scarcely at all less narrow; mandibles moderate, in great 

 part strigose (9 ), or with only a small area of oblique strigae near 

 the middle (cf); impressions similar; antennae rather long, much 

 shorter in the female; prothorax less transverse, barely one-half 

 wider than long, the grooves and impressions nearly similar, the 

 median pair of the latter more dilated inwardly at their posterior 

 ends; elytra more elongate, nearly one-half longer than wide, even 

 and very smooth throughout, seldom with the faintest trace of 

 punctulation at any point; legs (cf ) moderately long, the tarsi very 

 nearly as long as the tibiae and rather stout, the tibiae with only 

 about ten widely spaced stiff hairs within, or ( 9 ) distinctly shorter 

 throughout, the members similarly proportioned and the bristling 

 hairs similar. Length 23.0-25.0 mm.; width 9.3-9.8 mm. Arizona 

 (San Bernardino Ranch and Douglas, Cochise Co.; also from an 

 unrecorded part of the state). A good series of six specimens, very 

 homogeneous among themselves atronitens n. sp. 



26 Form rather depressed, elongate, black, shining; prothorax with the 

 lateral and basal margins bright brassy-green, shorter than wide, 

 the sides rounded and narrowly margined posteriorly, very briefly 



