172 ORTHOPTERA. 



Table for separating the Species of Derotmema. 

 A. Metazona of pronotum broad ; its hind margin rounded, rarely 

 obtusangukte. Surface of disc smoother. 

 b. Wing-band normally broader than the hind edge of the pro- 

 notum, reaching the margin posteriorly and percurrent, 



or broken only in the posterior axillary area 1. laticinctum, Scudd. 



bb. Wing-band narrower than the hind edge of the pronotum, 

 not reaching the posterior margin^ and for the most part 



lacking in the axillary field 2. delicatulum, Scudd. 



AA. Metazona of the pronotum, even in the ? , little or no broader 

 than at the eyes, its hind edge angulate. Surface of disc 

 strongly rugulose. 

 b. Rugosities of the pronotum above irregular. Dark band of 

 wings relatively narrow. Wings pale blue or citron. 

 c. Pronotum rectangulate, or nearly so, behind ; costal mar- 

 gin of the tegmina with dull fuscous and ashy tints in 

 nowise conspicuously contrasted ; basal half of the 



wings pale yellow [3. cupidineum, Scudd.] 



cc. Pronotum very obtusangulate behind ; costal margin of the 

 tegmina with vivid contrasts of black and pallid tints ; 



basal half of wings pale blue or sea-green [4. saussureanum, Scudd.] 



bb. Rugosities on the metazona of the pronotum forming regular 

 longitudinal ridges. Wing-band broad; base yellow or 

 citron 5. haydeni, Thorn. 



1. Derotmema laticinctum, Scudd. 



Derotmema laticinctum, Scudd. Proc. Amer. Acad. Arts & Sci. xxxv. p. 389 (1900) l ; Scudd. & 

 Ckll. Proc. Dav. Acad. Sci. ix. p. 31 (1902) \ 



Hab. Noeth America, various localities in Southern Arizona and New Mexico l 2 . 



While no Mexican records are at hand, this locust certainly occurs across the line in 

 Northern Chihuahua and Sonora. 



2. Derotmema delicatulum, Scudd. 



Derotmema delicatulum, Scudd. Proc. Amer. Acad. Arts & Sci. xxxv. p. 390 (1900) \ 



Hab. North America, near Yuma, Arizona, and Mojave, California (Scudder x ). 



Like the preceding, this species undoubtedly will also be found across the inter- 

 national line in Mexican territory. 



[3. Derotmema cupidineum, Scudd. 



Derotmema cupidineum, Scudd. Ann. Rep. Chief Eng. U.S. Geogr. Surv. W. 100th Merid. 1876, 

 p. 513 (1876) V; Sauss. Prodr. (Edip. pp. 156, 157 (1884) \ 



