'270 PROCEEDINGS OF THE ACADEMY OF [July, 



This insect is extremely close to M. ■picturatus Bruner, the latter 

 apparently differing only in the more robust form, decidedly larger 

 average size and constant brilliant coloration, in which the prozona 

 is normally conspicuously washed with pink, as are frequently the 

 outer surfaces of the caudal femora. 



Melanoplus femur-rubrum femur-rubrum DeGeer. 



1773. Acrydium femur-rubrum DeGeer, Mem. I'Hist. Ins., Ill, p. 498, 

 PI. XLII, fig. 5.^ [ [ 9 ], Pennsylvania.] 



Piedras Negras, Coahuila, 19 , [U. S. N. M.]. 



Cuidad, Durango, 8100 feet, (Forrer), 29 , [Hebard Cln.]. 



Aguascalientes, Aguascalientes, XI, 1887, (L. Bruner), 19 , [Hebard Cln.j. 



Guanajuato, Guanajuato, (A. Duges), lo^, [U. S. N. M.]. 



Guadalajara, Jalisco, VIII, 3, (J. F. McClendon), 1 9 ; (D. L. Crawford), 



1 9 , [both A. N. S. P.]. 

 Omilteme, Guerrero, 8000 feet, VII, (H. H. Smith), 1 9 , [Hebard Cln.]. 

 Merida, Yucatan, (Gaumer), 3 9 , [Hebard Cln.]. 

 Chichen Itza, Yucatan, (E. Thompson), Ic?, [Field Mus. Nat. Hist.]. 



It is of interest to note that though the species over the greater 

 portion of its distribution has the caudal tibise red, all of the present 

 series, excepting those from Ciudad, Guanajuato and Omilteme, have 

 the caudal tibise glaucous. Decided size and color, but no structural, 

 variation is shown by this material. 



Melanoplus lakinus (Scudder). 



1879. PezoteUix lakinus Scudder, Proc. Bost. Soc. Nat. Hist., XX, p. 79. 

 [cf, 9 ; Lakin and Pueblo, Colorado.] 



1897. Melanoplus viarculentus Scudder, Proc. U. S. Nat. Mus., XX, p. 139, 

 PI. X, fig. 1. [cf , 9 ; Monclova (nee Montelovez), Coahuila; Sierra 

 Nola, Tamaulipas; Sierra de San Miguelito, San Luis Potosi and Bledos, 

 San Luis Potosi; Zacatecas, and Aguas Calientes — all Mexico.] 



1897. Melanoplus lakinus Scudder, ibid., p. 141, PL X, fig. 2. [Nebraska, 

 Colorado, Kansas and New Mexico records.] 



1897. Melanoplus sonorce Scudder, ibid., p. 143, PI. X, fig. 3. [cf, 9, 

 Sonora, Mexico.] 



The synonymy of marculentus is clearly proven by comparison of 

 the different large series before us with the single type of lakinus^^ 

 and of marculentus}'^ An optimum condition, very robust in struc- 

 ture, is the basis for this name; the mesosternal differences noted by 

 Scudder are wholly due to slight individual variation. 



The typical series of sonorce is lost; the material clearly representing 

 dried alcoholic specimens of lakinus, in which the caudal tibise have 

 lost their glaucous coloration, becoming yellowish brown.-^ Material 

 similarly badly preserved is before us. 



"Here selected: c? ; Lakin, Kansas, September, 1; S. H. Scudder; Museum 

 of Comparative Zoology. 



20 Selected by Rehn and Hebard, Proc. Acad. Nat. Sci. Phila., 1912, p. 78, 

 (1912). 



21 See Rehn, Proc. Acad. Nat. Sci. Phila., 1907, p. 51, (1907). Scudder, in his 

 Revision, has frequently erred in studying such material, the effect of alcohol 

 upon tissue and coloration being apparently ignored. 



