256 Natural History Bulletin. 



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. Elytra 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. Abdomen one-fifth nar- 

 rower than the elytra, very convex, basal segment half as 

 long as wide, border very narrow, two minute carinae 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 

 tibiae with a long spur; the basal joint of the posterior tarsi is 

 obliquely truncate and the trochanters are small. 3 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 foveae and a frontal impression. 

 Antennae 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, ver}^ 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. ziMMERMANXi, Lcc. Reddish yellow, shining, convex, 

 pubescence short. Length, 0.9 to i.o mm. Plate VII., Fig. 37. 



