20 Natural History Bulletin. 



by four punctiform impressions. The front is produced, 

 emarginate at the apex, bilobed, the decHvous portion perpen- 

 dicular; in the middle is a nearly round excavation with sharp 

 edges, from which emerges a small horizontal tooth. Clypeus 

 a transverse vaulted elevation without further sculpture; 

 labrum transverse, emarginate. Antennce half as long as the 

 entire body, the joints cylindrical, decreasing in size; the 

 seventh longer than its neighbors, the eighth much smaller; 

 ninth obconical, larger; tenth globular, as thick as the last, 

 one-half longer than wide, and very acutely pointed. Protho- 

 rax slightly longer than wide, widest before the middle, where 

 the sides are arcuate; from this point the sides are nearly 

 straight to the neck and slightly sinuate posteriorly to the 

 base; the disk is convex, the middle sulcus shallow, nearly 

 entire, discal crests not prominent, basal tubercles acute; pos- 

 terior to the median basal is a small carina running to the 

 base; the lateral foveae are irregular, lateral sulcus a slightly 

 impressed line, leaving the marginal part of the disk continu- 

 ous with the vaulted discal surface. Elytra convex, punctur- 

 ed, one-fourth longer than the prothorax, sHghtly narrower 

 across the high prominent unarmed shoulders, and one-fourth 

 wider across the disk behind the middle; sutural lines straight, 

 close to the suture, interval punctured, shallow, discal impres- 

 sions scarcely one-fourth of the elytral length. Abdometi 

 with the basal lateral impressions very deep and large, the 

 middle one small, the carinas conspicuous and sharp, the mar- 

 ginal triangle broad at the base; the last ventral of the $, has 

 a deep circular impression. Legs strong; spine of the poste- 

 rior tibiae very long. $ antennce- shorter, tenth joint obconical, 

 front not produced, continuous with the clypeus. 

 Habitat. Pennsylvania, Illinois, Iowa. 



B. LiNEATicoLLis, Aube. Dark piceous, coarsely pubes- 

 cent, antennae and palpi dark red. Length 2.2 mm. Plate 

 X., Fig. 87. 



Head very flat, compressed between the vertex and the 

 under surface, width, including the eyes, equal to the 



