1878.] 287 [Scudder. 



extreme south, on the borders of Lake Tulare at the upper waters of 

 the San Joachin, and is remarkable for its resemblance to Pezotettix 

 enigma Scudd., a peculiar species also found in southern California, 

 but only known west of the Coast Kange. We cannot yet speak 

 definitely of M. sprelus (Uhl.), for although it has certainly been 

 taken in this region, it may not be native to it. Perhaps the re- 

 searches of Dr. Packard will establish this point. Probably all the 

 others are found upon both sides of the Sierras and their northern 

 extension, although one, a very small species, M. Kennicottii (which 

 I once 2 wrongly referred to Cal. bilituratus Walk., from specimens 

 taken by Mr. Dawson on the Souris River, a tributary of the Assini- 

 boine) is probably confined to the eastern side, as the only other 

 specimens I have (males) were taken by Mr. Kennicott on the Yu- 

 kon River, south of which the mountains trend westward. Still 

 another, M. Packardii, may also belong only to the- east, for it is an 

 abundant species as far eastward as Great Salt Lake, the South Park 

 and southern Colorado, Nebraska and Texas, and was taken by 

 Dr. Packard at Wallula on the Columbia, and by Mr. Crotch in 

 British Columbia — at what point is unknown. The other species 

 certainly occur on both sides, and most of them have a wide range. 

 M. femur -rubrum (DeGeer), for example, which is abundant over its 

 whole area of distribution, has been taken at Sissons, Cal. (Packard), 

 Ft. Redding (Pac. R. R. Surv.), the same and other points in Cali- 

 fornia (Edwards), Portland, Or. (Packard, Edwards), Great Bear 

 Lake (Kennicott), and also occurs at Great Salt Lake, Pueblo, Col., 

 central Texas (Belfrage), and even central Mexico (Sumiehrast) ; 

 from these points it extends eastward to the Atlantic, where it 

 ranges from Canada to central Florida; — having, probably, as wide 

 a range as any Acridian on the continent. M. atlantis (Ril.) proves 

 by its scarcely less extended distribution, the impropriety of its 

 name ; it is a more northern species, extending, on the Atlantic coast 

 from Canada to North Carolina, and westward through the northern 

 United States, and all parts of Colorado to Salt Lake, where it is 

 extremely abundant, to California, Wallula, Portland, Or., British 

 Columbia, Victoria, Vancouver's Island, and the Yukon River, 

 Alaska. M. devastator, a species which, probably, rather than 

 M. atlantis, is the source of most of the damage to crops in Cali- 

 fornia, besides being especially abundant in the Shasta Valley, and 

 found also at Sissons (Packard) and Sauzalito, Cal. (Behrens), 

 1 G. M. Dawson, Rep. Geol, and Resources Forty-ninth Parallel, p. 343. 



PROCEEDINGS B. 8. N. H. — VOL. XIX, 19 MARCH, 1878. 



