328 



REVISION OF THE TENKBRIONITLE OF AMERICA, 



CBATIDTJS, Leo. 



Cratidus, Leo., Class. Col. N. A., p. 289. 



After the characters given defining the tribe, and those above in the tabic of genera, 

 it is unnecessary to add anything further here. 

 Two species constitute this genus. 



I Hud angles of thorax distinct. osculans. 



Hind angles of thorax rounded. 



r o t u n d i c o 1 1 i s . 



239; Thomson, \r- 



B. osculans, Lee., (AmpMdora) Ann. Lye. V., p. 186; (Cratidus) Class. Col. N. A., 

 cana 1, pi. xii, lig. 4. 



The sides of the thorax are strongly rounded, and the hind angles distinct. The elytra 



are rather densely punctured, with an obscure tendency in larger punctures to form striae. 



The hairs are long, yellow, and erect. The sexes do not differ greatly in the shape of 



the body ; the males are, however, slightly narrower and more attenuate behind. 



Length .50-70 inch. 



Abundant in California, at and south of Fort Tejon. 



C. rotundicollis, similar in form to the preceding, but differing in the following particulars: 



Sides of thorax strongly rounded from the anterior to the hind margins, hind angles not prominent. Surface of 

 thorax more shining, less densely and coarsely punctured. Elytra with distinct strife of large punctures, intervals 

 lint,, very finely and sparsely punctured. Surface less densely pilose with shorter hairs. 



Length .66-.74 inch. 



The males here differ more notably in form from the other sex than in the preceding 

 species. The elytra of male are more elongate and are gradually narrowed from a point 

 slightly behind the humeri ; their dimensions in length and greatest breadth in the two 

 sexes are as follows: male length .50, breadth .39, female length .41, breadth .33 inch. 



The figure given by Lacordaire (Genera, pi. 57, fig. 3), although a rather inferior illus- 

 tration, will serve to give an idea of the form of the hind angles of the thorax; of 0. oscu- 

 lant, and the two species can at a glance be distinguished by this character as well as by 

 the distinct rows of punctures of the elytra of rotundicollis, and the denser and more irre- 

 gular puncturing of the other species. 



Lor my series of this species I must acknowledge indebtedness to Mr. Gabb, by whom 

 they were collected during an exploration of the Peninsula of Lower California. 



AMPHLDOKA, Each. 



Amphidora, Esch., Zool. Atl. Ill, p. 0. 



This genus may be known at once by the first joint of the hind tarsi being at least as 



long as the two following united. 



