AMERICAN COLEOPTERA. ^ 325 



The species known to me are as follows : 



Head convex without vertical fovea or occipital groove ceplialotes. 



Head convex with fine longitudinal occipital groove. rufipeniiis. 



Head convex with deep vertical fovea verticillis. 



P. cephnlotes is piceous with a paler thorax, rujipennis has paler 

 elytra, verticalls is more depressed than either and uniformly piceous, 

 the first is from the eastern region, the second from the Pacific coast, 

 the third from Colorado. 



P. cephalotes Lee. — -Elongate, subcylindrical, rufo-piceous, elytra darker. 

 Head convex without impressions, rather coarsely but sparsely punctured. 

 Thorax scarcely wider than the head, a little longer than wide, sides straight, 

 base feebly arcuate, coarsely but sparsely punctured, a vague smooth median 

 line, punctures somewhat elongate. Elytra very little wider than the thorax, 

 humeral angles dentiform, coarsely and moderately densely punctured, punc- 

 tures finer at sides and tip. Body beneath sparsely punctate. Length .20 

 inch; 5 mm. 



One 9 specimen, Pennsylvania. 



P. rnfipeiinis Horn. — Piceous black, elytra brownish red. Head with a 

 fine longitudinal occipital groove. Thorax sparsely punctured, punctures not 

 elongate, sides very slightly arcuate posteriorly. Elytra less coarsely punc- 

 tured than the preceding. Length .24 — .28 inch; 6 — ^7 mm. 



Quite distinct from the preceding species, but equally convex and 

 otherwise colored and sculptured. 

 Occurs in Oregon and Vancouver. 



P. verticalis u. sp. — Elongate, depressed, subcylindrical, piceous, legs 

 paler. Head coarsely and moderately densely punctured, a deep vertical fovea. 

 Thorax not longer than wide, narrowed posteriorly, sides nearly straight, feebly 

 arcuate posteriorly, surface with elongate punctures sparsely placed. Elytra 

 not densely punctured, punctures coarser near the base and slightly elongate. 

 Body beneath sparsely punctate. Length .26 inch; 6.5 mm. 



The tibiae of the specimen before me are devoid of the usual small 

 spinules, but this is probably owing to abrasion. 



One % Colorado, (Morrison). 



SMICRIPINI. 



Labrum moderately prominent. Maxillae one lobed. Mentum trans- 

 verse concealing the maxillae. Antennae eleven-jointed with a three- 

 jointed club. Tarsi three jointed. Anterior coxae open behind. 



With these words an aberrant tribe is characterized which exhibits 

 affinities with the great central mass of Nitidulidae, and in another 

 direction less strongly with the Mouotomidae. A discussion of the 

 question occurs farther on. 



There is but one genus at present known. 



