1007.] NATURAL SCIENCES OF PHILADELPHIA. 51 



MELANOPLUS Stil. 

 Melanoplus lakinus SoiuUlcr. 



Carr Canyon, Huachuca Mountains, September 22-27, October 8-20 

 (Biederman), 15 d", 13 9. 



These indivitluals would probably be Scudder's .1/. sonorae, as the 

 pronotuni is less expanded caudad than in average Colorado specimens 

 of lakinus, and the lateral faces of the caudal femora are either not at 

 all or but slightly marked -with the usual bars of lakinus. In the 

 author's opinion sonorae is no more than a geographic race of lakinus, 

 and may hardly be of such rank, as Colorado specimens of lakinus vary 

 greatly in size, somewhat in the expansion of the pronotum and 

 occasionally have the lateral face of the caudal femora without dis- 

 tinct markings. The reddish color of the caudal tibise of sonorae, as 

 mentioned in the original description, is possibly due to the t3^pe 

 specimens having been immersed in a liquid preservative, as the 

 individuals in hand all have the tibia glaucous. 

 Melanoplus aridus (Scudder). 



Carr Canyon, Huachuca Mountains, September 23 and 24, October 

 8 (Biederman), 2 c^, 1 9. Palmerlee, August 7 (Schaeffer), 1 9. 

 Douglas, August (F. H. Snow), 1 9 . 



From these specimens it is evident that this species varies consider- 

 ably in size, in parts of its range at least, the Cochise County individuals 

 being much larger than representatives from Florence, Ai'izona. These 

 latter are distinctly smaller than the measurements given by Scudder, 

 while a pair from Carr Canyon measure as follows: 



(^ 9 



Length of body, 21.5 mm. 29.5'^ mm. 



Length of pronotum, 5 " 7 " 



Length of tegmen, 4.8 " 5.5 '' 



Length of caudal femur, 12.5 '' 16 " 



Melanoplus desultorius n. sp. 



Types: c and 9 ; Carr Canyon, Huachuca Mountains, Cochise Co.,, 

 Arizona. September 24, 1905 (Biederman). [Hebard Collection.] 



Allied to M. aridus and closely resembling it superficially, but differ- 

 ing in the more sulcate frontal costa, the flattened and moderately 

 expanded cerci and in the interspace between the mesosternal lobes., 

 which is strongly longitudinal in the male, slight!}^ longitudinal in the 

 female. In the shape of the cerci this species approaches M. hum- 

 phreysii, but the caudal margin of the pronotum is as in M. aridus. 



" Abdomen distended bej'ond normal size. 



