256 NaTurAL History BuLuetin. 
last joint sessile on the penultimate, with a broad base. Pro- 
thorax one-fifth shorter than its width, nearly globose, trun- 
cate at the neck and base, the latter one-fourth the wider; 
disk very convex without sculpture excepting a zone of 
punctures near the base. A/ytra across the faint humeral 
ridge as wide as the prothorax, the suture being one-half 
longer. They are much the widest in the middle, sides evenly 
and strongly arcuate, disk very convex. Each elytron bears 
at the base three minute acu-punctures, the sutural lines very 
faint, parallel, dorsal lines wanting. Addomen one-fifth nar- 
rower than the elytra, very convex, basal segment half as 
long as wide, border very narrow, two minute carine at base. 
First ventral of the same length, with a longitudinal carina on 
each side one-fifth from the margin. Legs long and slender, 
tarsi with the second joint twice as long as the third, posterior 
tibia with a long spur; the basal joint of the posterior tarsi is 
obliquely truncate and the trochanters are small. ¢ differs in 
the form of the last antennal joint which is larger, pointed at 
both ends, and the front is impressed. This singular form 
belongs between Bythinus and Eutrichites, differing from the 
latter in the form of the antennal club and the larger basal 
abdominal segment. 
Habitat. Arizona. 
EuTRICHITEs, Leconte. 
Head with two occipital fovez and a frontal impression. 
Antenne with the joints small, only the last being very large, 
inserted in front of the antennal tubercles. Palpi with the 
second joint clavate, the third small, globular, fourth ovate, 
acuminate, more convex internally. Prothorax globose uni- 
foveate. Elytra convex, very long, discal lines wanting. 
Abdomen short, narrowly margined, dorsals equal or nearly 
so in length, first and second ventrals longer, tarsi long with a 
single claw. 
E. ZIMMERMANNI, Lec. Reddish yellow, shining, convex, 
pubescence short. Length,o.g to 1.0 mm. Plate VII., Fig. 37. 
