AMERICAN COLEOPTERA. 193 



tiires. Head densely and coarsely punctured in front, gradually more sparsely 

 posteriorly. Thorax twice as broad as long, anterior angles prominent and 

 partially concealing the eyes, sides slightly sinuate in front, rather broadly 

 arcuate at middle, hind angles broadly rounded, surface sparsely punctured 

 and with a few short recumbent hairs; margins fimbriate. Elytra oval, broad- 

 est behind the middle, humeri feebly prominent, apex subtruncate, surface 

 very finely alutaceous and sub-opaque, sparsely and finely punctured, each 

 puncture with a very short hair. Body beneath paler than above, sparsely 

 punctured and sparsely hairy. Legs pale testaceous. Length .40— .50 inch ■ 

 10-12.5 mm. ' 



The sexes are distinguished by a slightly longer club of the male 

 antennae. This species agrees with rotundata in the form of the 

 clypeus, its form is however more robust, the humeri much less dis- 

 tinct, and the sides of the elytra less parallel. It differs from both 

 •species by the number of the joints of the antennse. 



Several specimens were collected by Dr. Edward Palmer, on the 

 island of Guadalupe, on the coast of Lower California. 



€. ovipeiinis, n. sp.— Form elongate oval, color testaceous. Head coarsely 

 but very Fparsely punctured, frontal suture distinct, feebly impressed. Clypeus 

 rounded in front, margin moderately reflexed. Thorax twice as broad as'long, 

 sides gradually divergent posteriorly, hind angles broadly rounded, surface 

 smooth, sparsely and not coarsely punctured, margins with long fimbrise. 

 Elytra oval, slightly broader behind the middle, humeri obtusely roundedj-. 

 surface very sparsely punctate and with inconspicuous pubescence. Body be- 

 neath very sparsely punctured and sparsely hairy. Length .30 inch ; 7.5 mm. 



The apterous body and eight-jointed antennae serve to distinguish 

 this species. The clypeus also differs considerably in form from 

 rotundata. 



The third and fourth joints of the antennae are moderately lono- 

 and appear to be connate, each one having the appearance of beino- 

 formed by the fusion of two joints. This will account for the antenn^ 

 being eight-jointed in this, and ten-jointed in the preceding species. 



I have but one specimen $ , from Nevada. 



The three species present an extremely interesting series, their 

 salient characters being as follows : 

 C. rotundiiia, Lee. 



Clypeus emarginate and angulatc on each side. Antennce ten- 

 jointed. Elytra oblong, humeri distinct, wings well developed and 

 flexed, adapted for flight. 



C. socialis, Horn. 



Clypeus as in rotundata. Antennae nine-jointed. Elytra oval, 

 humeri obtuse, wings rudimentary not flexed, and not adapted for 

 flight. 



TRANS. AMER. ENT. SCO. V. (25) ^PriL, 1876. 



