AMERICAN COLEOPTERA. 219 



tooth very long; epistoma slightly elevated near the tip, with two small distant 

 cusps, supra-antennal ridges prominent ; vertex convex at the' middle, with a 

 short deep impressed line, transverse impression of the occiput obsolete; sub- 

 mental suture angulated; submentum slightly declivous, with a granulated 

 space at the middle; gula with a shallow but sharply defined triangular im- 

 pression. Length 9 mm ; .35 inch. 



%. — Seventh ventral' segment slightly sinuous at tip; eighth with two con- 

 verging lines, which soon become parallel; intermediate space corneous; 9> 

 eighth ventral very feebly impressed. 



Oue ^ , Nebraska; collected by Dr. F. V. Hayden ; 9, Illinois; 

 Dr. Horn. The head and prothorax are punctured as in B, gularis^ 

 that is, more strongly than in B. mandibularis. 



3. B, Tortii^, n. sp. — Blackish-brown, not shining, elytra reddish-brown; 

 mandibles long and stout, apical portion broad, compressed, obliquely and 

 strongly narrowed towards the tip; tooth broad and strong; epistoma truncate 

 slightly convex, with a few small punctures each side ; supra-antennal ridges 

 strongly elevated; vertex feebly transversely concave, impressed line longer 

 than in the other species, punctures very sparse and small. Prothorax sparsely 

 finely punctured, dorsal line deep. Submental suture straight; submentum 

 with a very deep excavation, which is almost divided by a narrow elevated 

 ridge. Length 10 mm; .40 inch. 



'J,. — Seventh ventral segment slightly sinuous at tip; eighth with a deep 

 triangular incision, not closed by membrane. 



9- — Submentum less deeply impressed; eighth ventral not incised. 



One S , Galveston, Texas ; 9 , Dr. Horn. The tooth of the mandi- 

 bles of the 9 is shorter and less prominent, and the body less robust ; 

 the elevation in the cavity of tne submentum is broader, almost as in 

 B. Tnandibularis S . 



4. B. mandibularis. Er. Staph. 765. — Yellow-brown, not shining; head 

 and mandibles blackish; apical part of mandibles compressed, suddenly nar- 

 rowed near the tip, tooth very long ; epistoma flat, supra-antennal ridges moder- 

 ate; vertex broadly concave, with a short longitudinal impressed line, sparsely 

 obsoletely punctured behind ; prothorax broader than long, sparsely irregularly 

 and feebly punctured, dorsal line deep, entire; elytra finely not deeply punctu- 

 late, dusky along the suture; dorsal segments smooth, shining, tip sometimes 

 darker; ventral segments sparsely punctulate; submental suture straight; sub- 

 mentum with a deep and broad excavation, the middle part of which is filled 

 by a broad flat elevation. Length 7.5 — 10 mm; .30 — .40 inch. 



'J,. — Seventh ventral segment slightly sinuate at tip; eighth with a deep 

 acute triangular incision, the bottom of which is closed by membrane. 



Abundant at New York, and other points on the Atlantic coast of 

 the Middle States. 



5. B. brevidens, n. sp, — This species is precisely similar in color and 

 sculpture to B. mandibularis, but is less robust in form, and the tooth of the 

 mandibles is short and oblique in both sexes. The cavity of th5 submentum is 

 broad and flat, without any central elevation. Length 10 mm ; .40 inch. 



%. — Eighth ventral segment with two distant slightly converging impressed 

 Jines ; tip slightly emarginate, or rather, triangularly impressed. 



