1917.] NATURAL SCIENCES OF PHILADELPHIA. 271 



Copete Mines, 30 miles east of Carbo, Sonora, (F. C. Nicholas), Id^, [A. M. 

 N. H.]. 



Escuinapa, Sinaloa, (J. H. Batty), 1 9, [A. AI. X. H.]. 



San Jose del Cabo, Lowei- California, 5 9 , [California Acad. Sci.]. 



Casas Grande, Chihuahua, IX, 1902, (W. E. Hughes), 1 9 , [A. X. S. P.]. 



Colonia Garcia, Chihuahua, (C. H. T. Townsend), Ic?, 1 9," (bothmacrop- 

 terous), [Hebard Cln.]. 



Monclova, Coahuila, (E. Palmer), 3 9, (1 macropterous), [M. C. Z.]. 



Torreon, Coahuila, X, 30, 1909, (J. Friesser), Id^, 19, (9 macropterous), 

 [Field AIus. Xat. Hist.]. 



TlahuaHlo, Durango, XII, 6, 1905, (A. W. Morrill), 19, [U. S. X. M.]. 



Lerdo, Durango, XI, 1887, (L. Bruner), 2 9, [Hebard Cln.]. 



Durango, Durango, XI, 27, 1909, (F. C. Bishopp), 56", 8 9, [U. S. X. M.]. 



Camacho, Zacatecas, XI, 1887, (L. Bruner), 1 9 , [A. N. S. P.]. 



Zacatecas, Zacatecas, XI, 1887, (L. Bruner), 5cf, 8 9, including paratypes 

 of M. marculentus,-^' [Hebard Cln. and A. N. S. P.]. 



Aguascahentes, Aguascalientes, XII, 1, 1909, (F. C. Bishopp), Id', 6 9, 

 (19 macropterous), [U. S. X. M.]; XI, 1887, (L. Bruner), id, 2 9, 

 [Hebard Cln. and A. N. S. P.]; XII, 9, 1898, 4cr, 5 9, {2d, 1 9 macrop- 

 terous), [Hebard Cln. and A. X. S. P.]. 



Guanajuato, Guanaiuato, XII, 11, 1898, 1 9, [Hebard Cln.]. 



Ocotlan, Jahsco, 5000 feet, VIII, 29 to IX, 1, 1906, (P. P. Calvert), Vd, 

 [A. X. S. P.l. 



Specimens from Monclova, Coahuila, and a series including the 

 type from Sierra Nola, Tamaulipas, show by far the optimum develop- 

 ment, being exceptionally large and robust. Decided size variation, 

 irrespective of geographic distribution, is found to occur, this par- 

 ticularly illustrated by the series from Aguascalientes. Very great 

 color variation is usual ; rare specimens are heavily washed with pink. 



Melanoplus mexicanus mexicanus (Saussure). 



1861. Pezotettix mexicana Saussui'e, Rev. et Mag. de Zool., (2), XIII, p. 160. 



{d , 9 ; Temperate Mexico.] 

 (Melanoplus atlanis of authors.) 



Careful study of the literature and the extensive series at hand 

 gives conclusive evidence that the widespread and abundant species, 

 known universally as M. atlanis, must be called mexicanus, atlanis 

 having been described in 1875. The name atlanis accordingly is 

 alone retained for the race of mexicanus widely distributed throughout 

 the eastern United States and vicinity. The species clearly divides 

 into several geographic races, which will be fully discussed in a 

 forthcoming study of the Xorth American MelanopH found North of 

 Mexico. 



Durango, Durango, XI, 27, 1909, (F. C. Bishopp), Id', 19, [U. S. X. M.]. 

 Aguascalientes, Aguascalientes, XI, 1887, (L. Bruner), Id', 19,-^ [Hebard 

 Cln.]. 



22 Incorrectly recorded by Bruner as M. cimeatus, in 1908. 

 ^^ In part incorrectly recorded by Scudder as M. flabellifcr in 1897 and by 

 Bruner as flabellifer in 1908. 

 2^ Recorded by Scudder as M. atlanis in 1897. 



