(68) 



Uhler's description as follows: The black stripe on the side of the 

 female pronotuiu is distinct and broad ; whitish spots on the metatho- 

 rax distinct in the male ; posterior femora yellow or greenish-yellow, 

 with distinct oblique dark bands ; posterior tibiae pale. 



36. Pez. viola, sp- nov. 



Female. Rather large and robust, caloptenoid in appearance, and 

 resembling somewhat Fez. dodgei. Vertex and frontal costa not, or 

 but slightly, sulcate. Pronotum with the median carina slight; lateral 

 carinae somewhat distinct ; sides flattened ; posterior margin rounded ; 

 posterior lateral margins with a distinct inward curve or rounded 

 notch at tUe humerus, the portion below the notch perpendicular. 

 Elytra ovate-lanceolate, the externo-median nerve distinct, not always 

 meeting at the base, but overlapping more or less toward the apex ; 

 varying in length from about one-third to more than one-half that of 

 the abdomen. 



Color. Varying from a dull olive-brown to ash-brown. Head and 

 thorax brown ; elytra with the upper (or inner) half pale brown, lower 

 (outer) half dark-brown or black, one or two dots sometimes broken off 

 the black at the tip : posterior femora reddish with oblique brownish 

 bands; posterior tibiae rufous. 



Dimensions. Length 1. to 1.1 inch. 



Central and southern Illinois. 



37. Caloptenus femiir-rubrum, Deg. 



Acrydium femur-rubrum, Deg. Ins., Ill, 498, PI. 2, Fig 5. 



femorale, Oliv. Encyc. Meth. Ins., VI, 228. 

 G-ryllus (Locusta) erythropterus, Grmel. Linn. Syst. Nat., I, 2086. 

 Caloptenus femur-rubrum, Burm. Handb. Ent., II, 638. 

 Pezotettix (^Melanoplusj femur-iubrum,Stal. Recens. Orthop., I, 79 

 Our most common species ; found throughout the state. 



38. C. atlantis, Riley, 1st Kept., 1875, 109. 



This is but a variety of the preceding species, and appears to be an 

 intermediate link betwean G. femur-rubrum and C. spretiLs ; but in 

 some respects approaches C. occidentalis. 

 39 ? C. spretus, Thos. (The Rocky Mountain Locust.) 



Acridium spretum, Thos. Trans. 111. Ag. Soc, V, 450. 

 Caloptenus spretus, Thos. Synop. Acrid , 164. 

 A few stray specimens have perhaps been captured in Illinois, and 

 hence I include it with a mark of doubt prefixed. 

 40. Acridium differentiale, Tuos., Trans. 111. Ag. Soc. ; V, 450. 



Cyrtacanthacris diflferentialis, Walk. Cat. Dermap. Salt., IV, 610. 

 Caloptenus diff'erentialis, Thos. Proc. Acad. Nat. Sci. Phila., 1871. 

 Common throughout the state, and has occasionally been seen mi- 

 grating. 



