290 Natural History Bulletin. 



The sexual differences consist of the usual impression on 

 the last ventral, and the more elongate last antennal joint in 

 the 5. This singular species is easily distinguished by the 

 sulcate occiput, the oblong intermediate basal fove« of the 

 elytra, and the long, divergent basal abdominal carina?. 



Habitat. Southern States near the sea-coast. 



B. GRACILIS, Casey. Dark piceous-red, convex, pubescence 

 very long, yellowish-vvhite, elytra blood-red. Antennae and 

 legs rust-red, palpi yellow. Length, 1.4 mm. Plate IX., 

 Fig. 60. 



Head, from the frontal margin to the base, as long as wide, 

 and from the labrum to the base much longer, impunctate, 

 the lateral margin above the eyes wavy, bisinuate, tempora as 

 long as the eye. Frontal margin very slightly arcuate, foveas 

 deep, equal, vertex and occiput convex. AntenncB longer than 

 the head and prothorax, first three joints uniformly decreasing 

 in length and thickness, third to seventh equal, slender, cylin- 

 drical; eighth quadrate, smaller, ninth trapezoidal, not trans- 

 verse, thicker; tenth also trapezoidal, wider than long, 

 eleventh compressed, twice as v^^ide as the ninth and as long 

 as the three preceding, and furnished with long hairs. Pro- 

 thorax wider than long, very convex, more so on the posterior 

 half, and declivous toward the base, impunctate, polished, 

 hairy, sides evenly and strongly arcuate; lateral fovete large, 

 circular, not in full view from above; median fovecC nude, 

 minute, near the base. Elytra as wide across the shoulders 

 as the prothorax, one-eighth longer, and not quite three-fourths 

 wider across the posterior third; they are very convex, sides 

 divergent, arcuate, discal lines sharp, nearly entire. Abdomen 

 convex, pubescence longer and denser than on the elytra, 

 basal carinee one-third the length of the first segment, includ- 

 ing nearly one-fourth of its width. Last dorsal with the 

 emargination at tip very small, last ventral transversely oval, 

 slightly impressed. 



Varies in the length of the abdominal carincr. 



Habitat. Michigan, Illinois, Iowa, Louisiana. 



