Goleopterological Notices, VI. 



533 



joints transverse, fifth but slightly dilated. Prothnva.v only about one-third 

 wider than long, the sides broadly arcuate near the base, moderately conver- 

 gent and straight thence anteriorly, becoming sinuate behind the apical angles 

 which are somewhat prominent laterally and not rounded; basal angles 

 broadly obtuse but not altogether obliterated; apex broadly arcuate and some- 

 what bilobed, the base arcuate; disk finely and sparsely pimctate, not rugose 

 near the sides. Eiytnt scarcely three-fifths longer than wide, not visibly wider 

 than the prothorax, nearly straight and parallel at the sides, the apex almost 

 semi-circular; disk rather coarsely and strongly, somewhat sparsely punctate, 

 the interspaces smooth and polished. Abdomen rather thinly cinereo-pubes- 

 cent. Length 2.4 mm. ; width 0.85 mm. 



California. 



The type of this species is a male, the fifth ventral being 

 simple and truncate at apex. It departs widel}' from any other 

 in the form of the prothorax, and may be recognized also by 

 peculiarities of vestiture, but in other respects is wholly similar 

 to the other species of the genus. A single specimen from an un- 

 recorded locality in the State. 



CRADYTES n. gen. 



There are several important points of difference between this 

 ^enus and Trichochrous, the chief of which refer to thoracic 

 structure, the rounded and obsolete apical angles and correspond- 

 ingly narrowed and advanced median parts of the apex, giving to 

 this somite a facies which is distinctively peculiar. The side mar- 

 gins of the prothorax are strongly serrate, and the antennae are 

 relatively still shorter than in Trichochrous, broader and with the 

 joints more serrate or asymmetric, to a much greater degree in 

 ser7'icollis, however, than in the other species. The ungual ap- 

 pendages are less constant and equal in Crad3'tes than in Tricho- 

 chrous, and are united to the claws in onl^^ about basal half of 

 their length. In other structural characters, including the form and 

 extent of the epipleurae, Cradytes is closely allied to Trichochrous. 

 The three species may be readil^^ differentiated as follows : — 



Body black, the elytra pale rufo-ferrugiuous 1. serricollis 



Eody black throughout; smaller species. 



Erect seta- of the elytra pale 2. loiigicollis 



Erect setaj black; body very slightly stouter 3. sei'i'lllatlis 



In geographical distribution Cradytes is practically limited to 

 the arid regions of New Mexico and Arizona, but it probably ex- 

 tends southward into Mexico to some extent. 



