54 NATURAL History BULLETIN. 
31 Pronotal fovee very large, not connected, the longitudinal sulcus indi- 
cated by an excessively fine line. Length 1.4 mm. - cavicollis. 
11 Pronotum longitudinally impressed in the middle. 
48 Head narrower than the prothorax. 
52 First dorsal segment without carinz; elytral discal lines short; sculpture 
of the head feeble. - - - - - - - debilis. 
51 Two dorsal segments with short carine, 
62 Elytra convex, sutural lines deeply impressed. 
Elytral discal lines one-half of the length of the elytron; im- 
pressions on head and prothorax very deep. - /ossilatus. 
Elytral discal lines short, impressions on head and prothorax not 
deep. - - : : - - - - - pumilus. 
61 Elytra depressed, plane, sutural and discal lines sharp, fine, and long. 
- - - - - - - - : - planipennis. 
4® Head as wide as the prothorax; shoulders wider than head or prothorax. 
72 Occiput sinuate, sides of the pronotum broadly, evenly, arcuate; sides of 
elytra nearly straight, divergent. 
82 Occipital fovee large, nearer together, sulcus deep. - rvotundicollis. 
81 Occipital fovez smaller, farther apart, ¢ with two spines emerging from 
under the third ventral segment. 
Pubescence inconspicuous. Length 1.3 mm. --  -. spintfer. 
Pubescence coarse, erect. Length 1.6 mm. - ‘-  sexualis. 
71 Occiput convex, not sinuate; sides of pronotum sinuate behind the mid- 
dle; sides of elytra arcuate. - - - - - interruptus. 
41 Head wider than the prothorax. 
9? Prothorax longer than wide. - - - - : - longicollis. 
g! Prothorax not longer than wide. 
102 Shoulders slightly wider than the head, prothorax narrower. 
Prothorax wider than long, base of abdomen as wide as the 
elytra. - : = : : : - = difficilis. 
Prothorax as wide as long, base of abdomen narrower than the 
elytra. - - - - - - - - congener. 
101 Shoulders as wide as the head, sides of elytra parallel; form linear, 
depressed. 
11? Pronotum with a fusiform median canaliculation. 
Occipital foveze widely separated; head not punctured. Length 
1.6 mm, - - - - - - - - linearis. 
Occipital fovez nearer together; head strongly punctured. 
Length 1.5 mm. - - - - - : confiuens. 
111 Pronotum witha small, elongate, median puncture. 
Occipital fovez near together, head strongly punctured. Length 
1.3 mm, - - - . - - - californicus. 
Occipital foveze three times farther apart than either from the 
eye; head impunctate. Length 1.6 mm. - longissimus. 
Occipital fovez very near together. Lengtho.g5 mm. - fertenuts. 
7 
58 
9 
Gl 
62 
G3 
eA 
oF 
66 
oF 
«8 
69 
FO 
F 
70 
