1906.] NATURAL SCIENCES OF PHILADELPHIA. 33 



by this series, is subject to little variation. Some of the females show 

 considerable variation in the angle of the fastigium. 



STAURORHECTUS Giglio-Tos.i^ 



1897. Staurorhectus Giglio-Tos, Bollett. Mus. Zool. Anat. Comp. Torino, 

 XII, No. 302, p. 25. 



Type. — S. longicornis Giglio-Tos. 



This genus is apparently closer related to Chorthippus (Stenohothrns) 

 than to any other genus of the group, the tegmina of the male being 

 rather similar in some species, but the lateral foveolse are very weak, 

 the lateral carinae of the pronotum are much less distinct and the 

 caudal femora slenderer. 



staurorhectus longicornis Giglio-Tos. 



1897. S[taurorhectus] longicornis Giglio-Tos, Bollett. Mus. Zool. Anat. 

 Comp. Torino, XII, No. 302, p. 26. [San Lorenzo and Tala, Argentina; 

 Caiza, Bolivia.] 



Campo Santo, Bolivia.^^ 1 d^. (BorelU, A. N. S. P.) San Lorenzo, 

 Jujuy, Argentina. 1 $ . (Borelli, A. N. S. P.) Sapucay, Paraguay. 

 March 2-27, 1905. 12^^(^,37 9 9. (Foster, Hebard Coll.) 



The interesting series listed above exhibits a very great range of 

 variation with four distinct color forms in the ? ; the cJ^ is more uni- 

 formly colored. These forms I will designate a, h, c and d, lettering 

 from the most diversified to the most uniform type. 



Type a. A median longitudinal line from fastigium to tip of teg- 

 mina buff, flanked by lines of blackish brown on pronotum and teg- 

 mina, on the latter occupying all except a narrow proximal costal 

 line of pale yellow. Lateral carinse distinct, light, slightly constricted. 

 Light bar on head slightly margined with brownish. Remainder of 

 lateral aspect, and caudal femora except the dorsal blackish line and 

 the reddish distal section, grass green. Represented by twelve speci- 

 mens. 



Type 6. Similar to type a, but green replaced by ochraceous brown. 

 Represented by eight specimens. 



Type c. The dorsal median line in this type is almost lost and nearly 

 concolorous with the lateral bars, so that dorsum from the fastigium 

 caudad is nearly uniform. Represented by six specimens, 



^* It is quite possible this may prove to be the same as Compsacris Bolivar 

 {Anales Sac. Espaii. Hist. Nat., XIX, p. 314, 1890) based on one species — C. 

 pulcher — from "Villa Bella en el Peru," which is apparently ViUa Bella, Bolivia, 

 at the junction of the Beni and Mamore rivers. If such should prove to be the 

 case Compsacris would replace Staurorhectus. None of the species examined by 

 the author are closely related to C. pulcher judging from the description. 



^'Labelled as above, but Campo Santo, Salta Province, Argentina, is probably 

 intended. 



