NORTH AMERICAN COLEOPTERA. 199 



tennal joint is broadly flattened beneath and bent to conform to the 

 curve of the side of the head. The third and fourth joints are the 

 broadest, and from this they gradually narrow to apex. When the 

 antennae are viewed on their narrow edge all the joints are equally 

 thick, but when seen from above are as described. The legs are all 

 rather stout, the four anterior femora being slightly swollen also, the 

 posterior are broadly oval and but feebly sulcate for the tibiae. 



These rather peculiar characters make the genus not an easy one 

 to place satisfactorily, but taking the other characters in reference 

 to their importance in other genera — the open coxal cavities, the 

 non-impressed thoi'ax and the broadly sulcate and margined tibiae — 

 no other course remains than to place it in the Aspicelites of Chapuis. 



I*, bicolor n. sp. — Oblong oval, moderately convex; beneath —bead and 

 thorax reddish yellovF, elytra bluish (not unlike in form and color to Gastroidea 

 polygoni). Antennse brownish, three bHsal joints rufotestaceous. Head sparsely, 

 very finely punctate. Thorax nearly three times as wide as long, slightly nar- 

 rowed in front, sides feebly arcuate, disc moderately convex, with two or three 

 vague depressions at the declivity, .surface finely, indistinctly punctate Elytra 

 not wider at base than the thorax, humeri broadly rounded, umboue not promi- 

 nent, sides feebly arcuate, disc moderately convex, the punctures moderately fine 

 aTid closely placed, with coarse punctures forming indistinct strise, which extend 

 nearly to middle. Abdomen punctate and wrinkled, sparsely pubescent. Length 

 .14 -.16 inch.; 3.5-4 mm. Plate VI, fig. 10. 



The male has the first joint of the anterior tarsi more dilated than 

 the female. The last ventral sinuate each side, the middle lobe 

 narrow and short. 



As remarked above the first appearance of this insect recalls 

 Gastroidea polygoni, but it is less convex and with finer punctuation. 



Occurs in southwestern Texas ; collected by Mr. 8. F. Aaron. 



Group VI.— DISONYCH^. 



Antennse 1 1-jointed. Thorax with base arcuate at middle, more 

 or less obliquely sinuate each side. Anterior coxal cavities open 

 behind. Posterior tibiae usually feebly sulcate near the apex. Claw 

 joint of hind tarsus not inflated, the claws appendiculate. 



This group has been separated from the Halticites of Chapuis in 

 consequence of the absence of any ante-basal impression of the 

 thorax. It has been found very inconvenient to retain the group as 

 constituted by Chapuis from the fact that the definition should include 



