304 



KELLOGG AND BELL 



In Scudder's Monograph of the MelanoplincE (1899) 129 

 species of Melanoplus are described, for 127 of which the num- 

 ber of tibial spines in the outer row is used as a specific charac- 

 ter, certain variation wnthin definite limits being ascribed to most 



Fig. 66. Frequency polygon of the variation in number of spines in outer 

 row of right tibite of 47 female red-legged locusts, Mclaiioplns fe7nur-yuhnim . 



of the species. The number ascribed \o Jeimir-rnhrum is " lo to 

 13, usually II." The range, in males alone, of our short series 

 covers all the typical numbers of spines (outer row) recorded and 



Fig. 67. Frequency polygon of the variation in number of spines in outer 

 row of left tibiae of 48 female red-legged locusts, Mchnio/'liis fc in it r- rub nun. 



used diagnosticaliy for all the species in Scudder's Monograpli. 

 There are no discernible marked differences between males 

 and females in the extent and character of the variations. 



