458 GEOLOGICAL SUE YE Y OF THE TEERITOEIES. 



of (E. corralUpes, I am satisfied, after a tiiorougli examination the i^res- 

 ent year of a number of specimens, is quite distiuct, the head alone 

 "being sufficient to distinguish the one from the other. 



CE. Carolina, SerY. 



Syn., G-ryllus {Locusta) CaroVmus.lAnn.', Grylhis Caro^";u^s, Fabr. ; Acrydinm Caro- 

 Jinum, Deg. ; Aa-ydium Carolinianum, Pal. de Ceauv. ; Locusta Caroliua, Harr. ; 

 Lociista Caroliniana, Catesby. 



I have found this species in all parts of the West that I have visited, 

 but never in great abundance. The specimens irom the plains are gen- 

 erally a paler ash-color than those found east of the Mississippi. Walker 

 (Cat. Dermap. Salt.) gives Vancouver's Island as a locality where it is to 

 be found. If he is correct in this, then we need e^'idence only in regard 

 to Southern Arizona and California to show that it is found throughout 

 the United States. 



CE. Sidpiurea^ Burm. 



Syn., GryUus sulphurcus, Fabr. ; Acridium sulpJuireum, Olir. ; Locnsia sulphttrea, 

 Harr. ; Tomonotus sulphurcus, Sauss. ; Gi-yJlus {Locnsia) sulphurcus, GraeL 



I did not meet with this species either in the Salt Lake Basin or 

 Snake Elver Valley, but I have specimens from California which appear 

 to belong to it, but they are rather too much damaged for me to decide 

 i:)Ositively. Walker {loc. cit.) gives Vancouver's Island and the west coast 

 of Xorth America as places where it is to be found. The specimens I 

 have from California appear to be somewhat intermediate between Sul- 

 pliurea and Xanthoptera^ except that the size is rather small. 



(E, sordida, Burm. (Handb. Ent., 11, 04:3.) 



Syn., Locusta periscelidis, Say, (in Harr. Cat. Ins. Mass., 56;) Locusta nchulosa 

 (Harr. Kep., 161 ;) Acridium sordiduvi, De Haan, (Kenu. Orthop., 143;) (Edipoda 

 vthulosa, Ubl., Harr. Eep., 181;) Qildipoda sorrfjde, \Yalk., (Cat. Dermap. Salt., 

 lY, 732.) 



I did not m.eet with this species west of or even at the east base of 

 the mountains, but find it among the collections made by Mr. C. R. 

 Dodge, in Nebraska. 



(E. afro.c, Scudd., (Hayden's Geol. Surv. Xeb., 253.) 



This is the destructive species of California, and notwithstanding the 

 fact that its wings are scarcely longer than its abdomen, yet it is able 

 to sustain itself in the air for a considerable flight. I do not think it can 

 fly any great distance, except with the wind, which bears it along. 

 But it seems surprising that it should even be able to do this. Those 

 who live in the east and have not seen a specimen of this species, can 

 see it almost, if not exactly, represented in (E. pcllncida of Scudder ; in 

 fact, Mr. Scudder's description of this species agix^es moreexactly, if possi- 

 ble, with specimens from Cahfornia submitted to me this season than 

 his description of atrox. The only diflerence 1 can find between the 

 two is that the median carina of the pionotum in atrox is severed by a 

 transverse incision, while that of iKllucida is entire. The examination 

 of more specimens of the two species than 1 liad before me may show 

 that even this difference is not permanent. Had Mr. Scudder found in- 

 dividuals of the two species in the same locality, I do not think he 

 would ever have thought of describing two species therefrom, yet that 

 does not prove that he is in error, for the widely dillerent habits and 

 the widely separated localities at which thev are found are suflicient to 



