42 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 



'wihich have been described up to the present time, except a few men- 

 tioned by older authors, which have not been identified in recent years: 

 C. femur -rubrum^ Deg. C. rohusius, Scudd. C. Yarrowi% Thos. 



spretus, Thos. TurnhulUi, Thos. regalis. Dodge. 



atlanis, Eiley. floridanus, Thos. fasciatus, Scudd. 



repletus^ Walk. angustipennis, Dodge. lielluo^ Scudd. 



MlUiiratis, Walk. plumbum^ Dodge. devorator, Scudd. 



punctulatus, Uhler. hivittatus, Say. ponderosus, Scudd. 



lurida. Dodge. differ entialis^ Thos. JlavolineatuSj Thos. 



7mnor, Scudd. griseus^ Thos. Keelerii, Thos. 



gracilipes^ Scudd. scriptus^ Walk. volucris^ Dodge. 



deletor, Scudd. occidentalism Thos. 



Although this list of species is somewhat large, it will be necessary 

 to call attention to but few of them, as the larger number can easily be 

 disposed of by reference to locality or a single character. 



C. spretus, or Eocky Mountain locust, as will hereafter be more fully 

 shown, is a comparatively small speciefe, the body seldom exceeding one 

 inch and a quarter in length, slender, the elytra or upper wings longer 

 than the body, of a pale brownish color, with small squarish darker 

 spots arranged along the middle line; body some shade of brown, never 

 distinctly green or bright yellow, and without pale or yellow stripes 

 along the back. 



By referring to locality, we may eliminate the following species : 

 C.floridanus and KeeleriL So far only found in Florida. 

 G. griseus. With spots scattered over the elytra ; rare, and hitherto dis- 

 covered only in Ohio. 

 C. hivittatus. A widely- dispersed species, much larger than spretus, 



with two yellow or pale stripes along the back. 

 C. differ entialis. Our largest species belonging to the genus, one and a 



half to two inches long, without spots on the elytra. . 

 0. T'urnhullii. Dull yellowish-brown, with two broad yellow stripes; 



wings scarcely as long as the abdomen. 

 C. repletus and scriptus. Hitherto found only in northwest part of Wash- 

 ington Territory. 



The following species are local in the places mentioned, and are dis- 

 tinguished by having the last abdominal segment of the male rounded 

 or squarely truncate at the tip, whereas that of spretus is notched : 

 C. plumbum, l^ebraska;^ tip of male abdomen rounded. 

 G. ponder osus, Texas; tip of male abdomen rounded. 

 G. robu$tus, Texas; tip of male abdomen rounded. 

 G. devorator, Texas : tip of the male abdomen truncate. 

 G. deletor m Texas ; tip of the male abdomen rounded. 

 G. glmicipesy Texas; tip of the male abdomen acuminate but rounded. 

 G.fasciatus, Texas and Nebraska; tip of the male abdomen rounded. 

 G. minor, Nebraska; very small; tip of the male abdomen tuberculate. 

 0. lurida, Nebraska ; last ventral segment of the male entire. 



j 



