1010 



FAMILY L1I. CERAMBYCIDiE. 



or (b) cylindrical and pointed at the tip. The front tibiae may have 

 an oblique sulcus or groove on the inner surface, or this groove may 

 be lacking. By combinations of two or more of these characters the 

 subfamilies are separated by the following : 



KEY TO SUBFAMILIES OF CEBAMBYCIDiE. 



(/. Thorax margined; labruin firmly united with the clypeus; body usually 

 broad and depressed. Subfamily I. Pbionin^e, p. 1010. 



aa. Thorax not margined ; labrum free ; body usually oblong, more or less 

 cylindrical. 



b. Front tibiae not grooved; last joint of palpi not acute at tip, often 

 sub triangular. Subfamily II. Cebambycin.e, p. 1013. 



bb. Front tibia? with an oblique groove on the inner side; palpi with last 

 joint cylindrical, pointed at tip. 



Subfamily III. Lamiin^, p. 1060. 



Subfamily I. PRIONINAE. 



Large-sized brown or blackish beetles having the elytra usually 

 leather-like in appearance ; mandibles strong, frequently elongated 

 in the males; last joint of palpi triangular; front coxae transverse, 

 with distinct trochantin. The mesosternnm is without stridulating 

 surfaces, but some of the species produce a noise in the same way as 

 do certain grasshoppers, i. e., by rubbing the hind femora against 

 the edge of the elytra. They are slow-moving insects, flying only in 

 the evening. Some of the tropical forms are the longest of beetles, 

 measuring five to six inches in length. The larvre are broad, some- 

 what flattened and have six very small but distinct feet. The sub- 

 family is separated into ten genera, only three of which are repre- 

 sented in Indiana. 



KEY TO INDIANA GENEBA OF PBIONIN^. 



a. Sides of thorax with two or three distinct teeth ; eyes strongly granu- 

 late. 



J). Form elongate, parallel ; antennae 11-jointed, more slender, the joints 

 not overlapping. I. Oethosoma. 



bb. Form stout, broad; antennae (in our. species) 12-20- jointed, more or 

 less overlapping, especially in the male. II. Pbionus. 



aa. Sides of thorax with one small, obtuse tooth near the base; eyes finely 

 granulate. III. Sphenostethus. 



I. Orthosoma Dej. 1834. (Q-r., " straight + body.") 



This genus is represented by a single large species having the 

 hind femora not deeply sulcate beneath and with several short, 

 elevated ridges on the inner side ? 



