DESCRIPTIONS OP NEW SPECIES. 1 1 



tenuiter striatis, interstitiis planis, stria 2nda postice bipunctata ; subtus 

 niger, pedibus antennisque rufls, his basi liaud carinatis. Long. -25. 



One female, Fort Yuma, California, very different from all our 

 other species of the division Poecilus by the first three joints of 

 the antennae not being carinated. 



34. P. desidiosus. Elongatus, niger, nitidus, thorace latitudine haud 

 breviore, lateribus rotundatis, postice paulo angnstiore, basi truncato 

 utrinque 1-striato, angulis posticis obtusis haud rotundatis, elytris striis 

 profundis antice punctatis, interstitiis paulo convexis, 3io tripunctato, 

 antennis pedibusque ferrugineis. Long. -28. 



"Western States. Similar in form and sculpture to P. femoralis, 

 but differs by the elytral striae being strongly punctured, instead of 

 feebly punctulate as in that species. The legs in two specimens 

 now before me are of a uniform red color, while in P. femoralis 

 the thighs are darker. 



35. P. loidsonicilS. Elongatus, niger pernitidus, thorace subcordato, 

 latitudine haud breviore, lateribus rotundatis, postice sinuatis, angulis 

 posticis rectis, linea dorsali tenui, basi utrinque impresso et punctato 

 et ad angulos obsolete foveato, elytris elongato-ovalibus, parum convexis, 

 striis antice punctulatis, interstitio 3io tri- vel quadripunctato, antennis 

 piceis, pedibus obscure ferrugineis. Long. 31. 



Hudson's Bay Territory ; Mr. Ulke. Nearly related to P. em- 

 petricola and several other Russian American species, but differs 

 from all of the same division in my collection by the thorax being 

 not wider than its length, and by the less convex elytra. 



36. P. tumescens. Apterus, piceus nitidus, thorace latitudine fere 

 sesqui breviore, lateribus valde rotundatis, postice angustato, basi truii- 

 cato, fovea elongata utrinque impresso, angulis posticis obtusis haud 

 rotundatis, elytris ovalibus convexis basi fere truncatis, striis antice 

 fortiter punctatis, externis obliteratis, interstitio 3io tripunctato, epip- 

 leuris, antennis pedibusque piceo-ferrugineis. Long. -33. 



Louisiana ; Mr. Ulke. This species is more nearly allied to P. 

 obscurus and ventralis than to any other of our native species ; it 

 has like them but five striae on each elytron, and the scutellar stria 

 is absent ; the 2d dorsal puncture is situated on the 2d stria as 

 usual. It differs from the two species above named by the hind 

 angles of the thorax being distinct and not at all rounded, but 

 this is not sufficient to separate it from them as a distinct division 

 of the genus. 



