72 OETHOPTEEA. 



This genus is represented by a single variable species. It is a characteristic locust 

 of the arid and semiarid regions of western North America, from the plains of the 

 Saskatchewan to an indeterminate point on the interior tablelands of Mexico. The 

 following brief synonymy will give the reader some notion of its variability. 



l. Phlibostroma quadrimaculatum, Thomas. 



Stenobothrus quadrimaculatus, Thomas, Prelim. Rep. U.S. Geol. Surv. Wyom. p. 280 (1871) l ; 



Syn. N. Amer. Acrid, p. 93 (1873) 2 ; Bruner, Rep. U.S. Ent. Comm. iii. p. 56 (1883) 3 . 

 Phlibostroma quadrimaculatum, Bruner, Bull. Washb. Lab. Nat. Hist. i. no. 4, p. 135 (1885) *; 



McNeill, Proc. Dav. Acad. Nat. Sci. vi. pp. 248, 249, t. 4. figg. 19, 19 a, b (1897) 5 ; Scudd. 



Cat. Orthopt. U.S. p. 23 (1900) 6 . 

 Phlibostroma pictum, Scudd. Proc. Bost. Soc. Nat. Hist. xvii. p. 517 (1875) 7 ; Bruner, Rep. U.S. 



Ent. Comm. iii. p. 57 8 ; Publ. Nebr. Acad. Sci. iii. p. 23 (1893) 9 . 

 Phlibostroma parvum, Scudd. Ann. Rep. Chief Eng. 1876, p. 510 (1876) 10 ; Bruner, Rep. U.S. 



Ent. Comm. iii. p. 57 n ; Bull. Washb. Lab. Nat. Hist. i. pp. 198, 199 (1886) 12 . 

 Stenobothrus latus, Uhler, Bull. U.S. Geol. Surv. Terr. iii. pp. 792, 793 (1877) 13 . 

 Phlibostroma latum, Bruner, Bull. Washb. Lab. Nat. Hist. i. p. 199 14 . 



Hob. North Amekica 1 " -14 , Plains of the Saskatchewan to the interior tablelands of 

 Mexico. — Mexico, Northern Chihuahua {Bruner). 



Not represented in any of the Mexican collections before me, but observed by me 

 while collecting other insects in the mountains of Northern Chihuahua during the 

 autumn of 1887. 



ORPHULA, Stal *. 



Gomphocerus (Hyalopteryx), Stal, Kongl. Svenska Freg. Eug. Resa, Ins., Orthopt. p. 339 (1860) 



(part.) . 

 Truxalis (Orphula), Stal, Recens. Orthopt. i. p. 105 (1873) (part.). 

 Orphula, Stal, Obs. Orthopt. ii. p. 42 (1876). 



A genus composed of medium-sized insects belonging to Tropical America, and 

 possibly represented by several species. The type of Orphula, 0. pagana, Stal, is 

 found in Southern Brazil, Paraguay, and Northern Argentina. Two other species 

 are now added. They may be separated as follows : — 



A 1 . Fastigium of the vertex with its antero-lateral edges decidedly rounded. 



Basal joints of the antennae greatly depressed. Lateral carinse of the 



pronotum only gently divergent on the hind lobe [1. pagana, Stal.] 



A 2 . Fastigium of the vertex with its antero-lateral edges nearly straight. 



Basal joints of the antennae only gently depressed. Lateral carinse of 



the pronotum strongly divergent on the hind lobe. 



* Since the publication of the Synopsis of the Genera of Tryxalinae (anted, pp. 26-34), two insects have come 

 into my possession which seem to belong to this genus. 



