AMERICAN COMPONENTS OF THE TENTYRIIN^ 505 



wider than the prothorax aiul two and one-half times as long, 

 rather abruptly and broadly ojj^ival behind, the sides parallel and 

 very feebly arcuate to the distinct and angulatc humeri, which are 

 only a little exposed at base, the surface very convex and highly 

 polished, with close-set series of punctures laterally, the punctures 

 coarser than usual, not very close-set in the series and without 

 attendant carinules, each with a very minute spiculiform promi- 

 nence at its anterior edge, not quite so coarse, sparse and almost 

 wholly confused toward the suture ; abdomen finely, very sparsely 

 punctured, somewhat coarsely but not densely or rugosely near 

 the sides. Length 3.3 mm. ; width 1.2 mm. Colorado (Greeley). 



montanus Csy. 



Elytral punctures laterally each at the posterior end of a distinct longi- 

 tudinal carinule extending almost to the next anterior puncture ; 

 body more elongate in form and less convex, less strongly- 

 shining 6 



6 — Form modei-ately stout and convex, somewhat shining, black, the 

 head anteriorly and the elytra effusedly picescent ; antennce pice- 

 ous, the legs rufous; head evenly trapezoidal, not coarsely but 

 closely and very asperately punctate, the upper lobe of the eyes 

 larger, elongate and subparallel ; prothorax less transverse, scarcely 

 more than one-half wider than long, two-thirds wider than the 

 head, widest at the middle, the sides broadly rounded, more con- 

 verging and straight basally, the base distinctly narrower than the 

 apex, the angles very obtuse but not at all blunt, the apical pro- 

 jecting but little anteriorly and bluntly rounded ; punctures fine, 

 perforate and close-set, with a narrow smooth line medially, 

 becoming less fine, rugulose, closer and longitudinally confluent 

 laterally ; elytra one-half longer than wide, a little wider than the 

 prothorax and two and three-fourths times as long, oval, gradually 

 but very obtusely ogival posteriorly, the sides distinctly and evenly 

 arcuate to the obtuse and evidently rounded humeri, the punctures 

 fine, in close-set even series throughout, the carinules obsolete 

 toward the suture, the alternate series toward the sides very feebly 

 elevated ; abdomen shining, rather coarsely but not very closely 

 punctured. Length 3.7 mm.; width 1.35 mm. California 

 (southern) catenulosus n. sp. 



Form still less stout, moderately convex, piceous-brown throughout, 

 glabrous, shining; head nearly as in the preceding but smaller and 

 less densely, though otherwise similarly, pifnctato-asperate, the 

 eyes much smaller, the upper lobe short and subtriangular in form ; 

 prothorax shorter, three-fourths wider than long, finely but deeply, 

 rather less closely punctured medially, with an irregular smooth 

 line, only a little larger and closer but asperulate laterally, in out- 

 line nearh- as in cateti7closus, except that the sides are less con- 

 verging posteriorly and slightly arcuate and not straight ; elytra 

 nearly similar but narrower and somewhat more elongate, not at 

 all wider than the prothorax, more acutely ogival at tip and with 



Proc. Wash. Acad. Sci., October, 1907. 



