218 J. L. LECONTE, M. D. 



closed or open according to position of coxas. Front and middle tibiae 

 triangular, with widely separated rows of long spines; hind tibiae 

 slender, fimbriate with a few very long hairs, and sparsely spinose. 

 The abdominal segments are very finely alutaceous, not punctured 

 above, finely and sparsely punctulate below. 



The species of this group resemble each other very closely and 

 might be readily confounded, if it were not for the differences in 

 the gular process (submentum), and the sexual characters. In the 

 neighborhood of the ocean they live in salt marshes, and their occur- 

 rence on both sides of the continent, with a closely allied form in the 

 interior, indicates an origin and distribution similar to that of species 

 of various genera already mentioned by me. I have interpreted such 

 cases to be unmodified, or (in this instance), slightly modified survivals 

 of ancient forms and probably from the cretaceous period. 



Submental transverse suture, angulated at the middle 2. 



Submental transverse suture, straight 3. 



2. — Gula with a very deep triangular excavation 1. gularis, n. sp. 



Gala with a shallow excavation 2. pallipennis. 



S. — Submentum excavated; 



Excavation deep, divided by a prominent ridge 3. Tortis, n. sp. 



Excavation wider, divided by a broad, flat elevation, 



4. niaudibtilaris. 



Excavation wider, flat at the bottom 5. brevideus, n. sp. 



Excavation shallow, divided by a narrow median elevation. 



6. ferratn!i>, n. sp. 

 Excavation small, shallow 7. jacobinus, n. sp. 



1. B. gnlaris.— Yellow-brown, not shining; head, mandibles, suture, diago- 

 nal tip of elytra, and last two abdominal segments blackish; .apical part of 

 mandibles slender, tooth very long; epistoma with a prominent subapical 

 tubercle, or short horn, which is emargiuate at tip; occiput with a deep trans- 

 verse short impression, which is met by the short deep impressed line of the 

 vertex; supra-antennal ridges prominent; submental suture angulated; sub- 

 mentum flat, strongly declivous; gula with a very deep triangular excavation. 

 Length 7.5 mm; .30 inch. 



%. — Seventh ventral segment slightly sinuous at tip, eighth with two im- 

 pressed lines converging in front, intermediate space corneous; 9> eighth seg- 

 ment feebly impressed. 



One S , Middle States; precise locality unknown ; 5, Illinois; Dr. 

 Horn. 



The sculpture is exactly as in B. maiidibularis, from which it differs 

 only by the punctures of the prothorax and back part of the head 

 being stronger, and by the characters above mentioned. 



2. B. pallipennis, Er. Staph., 779 ; Oxytelus pall.. Say, Journ. Ac, Nat. 

 Sc. iii, 155; ed. Lee. ii, 100. — Yellow-brown, not. shining; head and mandibles 

 blackish, suture and tip of elytra fuscous; apical part of mandibles slender. 



