DESCRIPTIONS OF NEW SPECIES. 



thorace latitudine baud breviore, ovato antrorsum modice angustato, 

 confertim punctate, vitta dorsali \gsvi nitida, elytris thorace hand longi- 

 oribus, micantibus, dense subtilius punctatis, abdomine confertim punc- 

 tulato, antennarum basi pedibusque testaceis, coxis piceis. Long. '33. 



Illinois and Nebraska. Of the ordinary form of Philonthus, 

 but remarkable for the dense punctuation of the thorax. The 

 antennae are piceous, with the first three joints testaceous, gradu- 

 ally thickened externally, with the outer joints nearly square, and 

 the last joint strongly acuminate beneath; the 3d joint is longer 

 than the 2d or 4th. 



LEPTACItfUS ER. 



13$. L,. flavipes. Nigro-piceus nitidus, capite crebre fortiter punc- 

 tato, vitta angusta media laevi, thorace oblongo-ovali utrinque parce 

 punctato, seriebus dorsalibus 12 16 punctatis, elytris parce subtilius 

 punctatis, pedibus flavo-testaceis. Long. -18. 



Middle and Western States; rare. The dorsal abdominal seg- 

 ments are finely and sparsely punctulate. 



139. L,. loiigicollis. Nigro-piceus, vel piceus nitidus, parce setosus, 

 capite confertim punctato, vitta media Isevi, tborace elongato-ovali, pos- 

 tice vix angustato, sat dense subtiliter punctate, vitta dorsali Isevi, ely- 

 tris parce subtiliter punctatis, abdornine punctulato, ano, antennarum 

 basi pedibusque testaceis. Long. '13. 



Middle States, usually in ants' nests. The form of the thorax 

 is different in the species of this genus from that observed in 

 Leptolinus: in the latter it is elongate, narrowed behind, and 

 feebly sinuate on the sides, as in ordinary Xautholinus ; in Lep- 

 tacinus it is elongate oval, scarcely narrowed behind, and broadly 

 rounded on the sides. By an error this species has been placed 

 in Leptoliuus in the Catalogue. 



LEPTOMNUS KKAATZ. 



14O* L. parciis. Niger, parce setosus, capite elongate oblongo, tho- 

 raceque parcius baud profunde punctatis, vitta media laevi male definita, 

 elytris piceo-testaceis, parce punctatis, segmentis ventralibus postice 

 pedibusque piceo-testaceis. Long. -26. 



California, San Jose; not rare. The antennas are thick, about 

 one-fourth longer than the head ; the abdomen is sparsely punc- 

 tulate. 



