1S73.] J-—^ [Horn. 



tures not densely placed, elytra with three rows of nearly obsolete coarser 

 punctures, the first near the sutural stria, the second at the middle and 

 the third lateral. Body beneath as in normatus. Mesosternal crest acute 

 at tip, under edge sinuate and with the tip pointing downwards. Pro- 

 sternum feebly cristate. Length .20 inch ; 5 mm. 

 Occurs from Oregon to San Francisco. 



P, fucatus, n. sp. 



Oblong oval, slightly narrower in front. Head black, thorax and 

 elytra ochraceous, surface very shining, more finely and less closely 

 punctulate than the preceding, but more distinctly punctured on the 

 thorax than the elytra. Body beneath black, finely punctulate and very 

 sparsely pubescent. Femora, black, opaque, punctured and pubescent 

 except at tip. TibiaB and tarsi rufous. Palpi and antennae testaceous, 

 the club of the latter somewhat darker. Mesosternal crest prominent, 

 slightly mucronate at tip. Prosternal crest moderate, more prominent iu 

 front. Length .20 inch ; 5 mm. 



Broader and less convex than carinatus and scarcely narrowed in front. 

 The sculpture is similar in both, but the thorax is rather more distinctly 

 punctured in the present species. From the four species which follow, it 

 differs by its larger size and more prominent mesosternal crest slightly 

 mucronate at tip. 



Utah and Arizona. 



P. nebulosus, Say. (Hydrophilus,) Long's Exped. 2, 277. 



Oblong, equally narrowed at each extremity. Head black, clypeus on each 

 side ochraceous. Thorax and elytra pale ochraceous, the former usually 

 paler. Surface finely and sparsely punctulate, head more distinctly 

 punctured than the thorax, and the thorax than the elytra. Body beneath 

 black, sparsely punctulate and pubescent and feebly shining. Femora 

 black, tibise and tarsi piceo-testaceous. Palpi and antenna? testaceous 

 the club slightly darker. Mesosternal crest with angle acute but not 

 mucronate, prosternal crest moderate, more strongly elevated in front. 

 Length .16 inch ; 4 mm. 



Occurs from Canada to Georgia and Kansas. 



Closely resembles ochraceus, but may be distinguished by the more 

 prominent mesosternal crest as well as by the presence of the prosternal 

 elevation. The three rows of nearly obsolete larger punctures on the 

 elytra of most of our species, are scarcely visible in the present one. 



P, pectoralis, Lee. Proc. Acad. 1855, p. 370; maculifrons, Motsch. 

 Bull. Mosc. 1859, III, p. 17!). 



Similar to the preceding, but smaller, more elongate, more shining, 

 punctures of surface scarcely visible. Clypeus testaceous with narrow 

 median fuscous band. Head black. Length .11 inch ; 3 mm. 



P. cristatus, Lee. loc. cit. 



More elougate than pectoralis, and more narrow in front than behind. 

 Sides of thorax feebly arcuate. Elytra more distinctly punctured than 



