34 COLEOPTERA OF NORTH AMERICA. 



punctures on the elytra, and the Californian S. tener Lee, without 

 rows of punctures. The form is more elongated than that of any 

 true Harpalus or Stenolophus, and the last joint of the maxillary 

 palpi, besides being longer, is more conical, almost forming with 

 the preceding a fusiform mass, as in Trechus. They are found in 

 wet places, and are quite rare. 



Tribe XIV.— POGOKIXI. 



The ligula is free at the apex, with distinct paraglossae; the 

 palpi are slender, and the last joint is nearly cylindrical; the men- 

 turn tooth is distinct, emarginate at tip. The anterior tibiae are 

 slightly thickened, with a few apical spines; the two basal joints of 

 the anterior tarsi are dilated in the male, with two rows of papillae 

 beneath. The antennae have but two basal joints glabrous, the 

 third is elongated and pubescent. The head has deep frontal im- 

 pressions, and is slightly constricted behind. The epimera of the 

 mesothorax are short, and but very slightly widened externally. 



This tribe is represented in our fauna by the genus Patrobus 

 alone;* one species, P. longicornis Say, is found commonly under 

 stones in the Atlantic region, the others are northern, and species 

 are found on both sides of the continent. 



The position of these insects is disputed by different authors. 

 Schaum, the latest authority, ranges them with Pterostichini; but 

 the difference in the number of dilated tarsal joints in the male 

 seems to warrant their separation, and indeed almost their union 

 with the next tribe, with which they were associated by Erichson. 

 The pubescence of the antennae nearly covers the third joint, a 

 character found exceptionally (according to Schaum) in the tribe 

 Pterostichini, but which is not seen in any of the species in our 

 fauna. 



The species of Patrobus having convex thorax have the eighth 

 stria of the elytra confluent with the margin anteriorly; in those 

 with flat thorax the stria is separate from the margin for its whole 

 length. 



Tribe XV.— TRECHEVI. 



In this tribe the ligula has eight bristles, and is free at the 

 apex, with distinct and long paraglossae; the palpi have the last 



* Pogonus minutus Dej. is not found in the United States, as stated by him. 



