328 REVISION OF THE TENEIiRIoXiru: OF AMERICA, 



< RATIDUS, I , 

 Crat X. A., p 



\ :• r the characters given defining the tribe, and those above in the tabic of genera, 

 it i< unnecessary to add anything further h< 

 \'\\ • - institute this genus. 



Hind angles of thorax distinct. osculans. 



Hind angles of thorax rounded. rotundicolli 



Ann. Lye. V.. p. li X. A., p. 239; Thomson, Ar- 



'. pL xii. : 



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 -trise. 

 I hairs arc long, yellow, and erect. Tin- sexes do not differ greatly in the shape of 



the body ; the males are. hi s _ htly narrower and more attenuate behind. 



1. ugth .50— .70 inch. 



Abundant in California, at and south of Fort Tejon. 



itandicollis, similar in form to the preceding, but differing in the following particulars: 



im the anterior to the hind margins, hind angles n >t prominent. Sin ! 

 thorax more shil irsely punctured. Elytra with distinct stria; of large punctures, intervals 



ery finely and sparsely punctured. Surface less densely pilose with shorter hairs. 

 Length .66-74 inch. 



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

 The elytra of male are more el _ I and are gradually narrowed from a point 

 - ghtiy behind the humeri ; their dimensions in length and g I si breadth in the two 

 si v - in as follows: male length .50, breadth .39, female length .44, breadth .33 inch. 



The figure given by I. or laire (Genera, pi. ~>~. 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 C. oscu- 



-. and the t\\ - - in at a glance be distinguished by this character as well a> by 



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

 gular puncturing of the other sp i i s. 



For nn - s of this s - 1 must acknowledge indebtedness to Mr. Gabb, by whom 



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



AMPHIDORA, Esch. 

 Ampbtdora, E Atl. III. p. 9. 



This genus may be known at once by the fir^t joint of the hind tarsi being at leasl - 

 long as the two following united. 



