50 DESCRIPTIONS OF NEW SPECIES. 



comparison of specimens I find that in ours the punctures of the 

 thorax are considerably smaller ; the punctures of the elytra are 

 also less densely placed, but in this respect the dhTerence is by 

 no means obvious. 



STENUS Latr. 



115. S. renifer. Niger opacus, fortiter dense punctatus, albo-pubescens, 

 thorace latitudine longiore, elytris macula minuta lunata fulva, antennis 

 fuscis, palpis pedibusque pallidis, femoribus apice late infuscatis. Long. 

 •22. 



Fort Yuma, California. Very similar to S. colon, but the ely- 

 tral spot is smaller and lunate in form, and the thorax is more 

 narrowed at tip ; in S. colon the spot is larger, and though also 

 emargiuate in front, is not lunate. 



116. S. semicolon. Niger subfenescens, snbtiliter albo-pubescens, 

 fortiter dense punctatus, thorace latitudine longiore, elytris gutta minuta 

 rotundata fulva, antennis palpisque nigro-piceis, his articulo lmo testa- 

 ceo, pedibus ferrugineis. Long. '15. 



One specimen, Pennsylvania. Quite distinct by the above cha- 

 racters. Less slender in form than the other species with spotted 

 elytra. 



171. S. comma. Niger subaenescens, subtilissime albo-pubescens, 

 fortiter dense punctatus, thorace latitudine longiore, utrinque fere sequa- 

 liter angustato, elytris gutta parva rotundata fulva, palpis basi testaceis, 

 antennis pedibusque nigris. Long. '20. 



Middle and Western States; not rare. 



EDAPHUS Lec. 



US. E. nitidlls. Testaceus nitidus, glaber, lsvis, capite biimpresso, 

 thorace latitudine fere breviore, subcordato postice angustato, ante basin 

 foveis 4 magnis insculpto ; elytris stria suturali vix conspicua. Long. 

 •04. 



Alabama and Louisiana ; Col. Motschulsky and Dr. Schaum. 

 This insect might be readily considered as a Pselaphide, allied to 

 Euplectus, but the tarsi are four-jointed, and the abdomen is flex- 

 ile. The antennae and palpi are as in Euassthetus, from which 

 this genus differs principally by the smooth impunctured body. 



