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 ¢. This singular species is easily distinguished by the 
sulcate occiput, the oblong intermediate basal fovez of the 
elytra, and the long, divergent basal abdominal carine. 
Habitat. Southern States near the sea-coast. 
B. GRAcILIs, Casey. Dark piceous-red, convex, pubescence 
very long, yellowish-white, elytra blood-red. Antenne and 
legs rust-red, palpi yellow. Length, 1.4 mm. Plate IX.,, 
Fig. 60. 
flead, 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, fovez 
deep, equal, vertex and occiput convex. Antenne 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 wide 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 fovez large, 
circular, not in full view from above; median fovee nude, 
minute, near the base. /ytra 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. Addomen 
convex, pubescence longer and denser than on the elytra, 
basal carinz 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 carine. 
Habitat. Michigan, Illinois, lowa, Louisiana. 
