The Pselaphid^ of North America. 25 



the base, the transverse impression deep, the middle one the 

 smallest, caringe short; the basal segment is nearly twice the 

 length of the second, the lateral triangular borders of the seg- 

 ments narrow. Legs long, thighs clavate, posterior tibi« 

 with a long spinous process, the intermediate ones in the $ 

 with a short process at the end. ?, frontal margin straight 

 between the antennae, dechvous towards the simple clypeus. 

 AnteniKE shorter, the tenth joint rounded, obconical, little 

 thicker than the ninth. 



Habitat. East of the Mississippi river. 



This species is the t3-pe of a series of forms which have the 

 following characters in common: The occipital fovese are 

 nude, the tenth joint of the 6 antenna, is large, globular, of 

 similar form, more or less flattened beneath, and with a deep, 

 sharply defined fovea near the base. The species now known 

 of this group are as follows: B. globosiis^ B. spretus, B. 

 foveicornis^ B. ■pimctifrons. 



B. VIRGINIA, Cascw Black, shining: elytra dark red: an- 

 tennae and legs brown, palpi lighter; pubescence abundant. 

 Form as in B. deniicoUis. Length, 2 mm. Plate XII., Fig. 



139- 



Head large, quadrate, eyes small, far below the surface of 



the nearl}- fiat vertex: occiput with a short carina, vertex with 

 two small, nude fove^e connected b}- an arcuate, shghtl}- im- 

 pressed, sulcus. The portion of the head outside the sulcus 

 is finely and denseh* punctured, the frontal margin slightly 

 elevated in the middle; antennal portion flat, declivous in 

 front, with the usual setose, lateral, dentation; the lower part 

 of the declivity is produced in the middle horizontally, as a 

 triangular horn, which is notched at the tip and overhangs 

 the deep interantennal excavation; in the middle of the ante- 

 rior margin of the clypeus is a small rounded tubercle 

 crowned with two tufts of hair; the lateral margin is angular 

 and shghtly retuse; the posterior part of the head is impunc- 

 tate. AnteuHce with the first joint arcuately cylindrical, twice 

 as long as wide, as long as the second and third together; 



