20 NATURAL History BuLukEtTIN. 
by four punctiform impressions. The front is produced, 
emarginate at the apex, bilobed, the declivous 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. Antenne 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 fovee are irregular, lateral sulcus a slightly 
impressed line, leaving the marginal part of the disk continu- 
ous with the vaulted discal surface. /ytra convex, punctur- 
ed, one-fourth longer than the prothorax, slightly 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. Addomen 
with the basal lateral impressions very deep and large, the 
middle one small, the caring 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 tibiz very long.  a@nxtenne shorter, tenth joint obconical, 
front not produced, continuous with the clypeus. 
Habitat.. Pennsylvania, Illinois, Iowa. 
B. LINEATICOLLIS, Awbé. Dark piceous, coarsely pubes- 
cent, antennez 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 
