56 



THE VARIATION AND CORRELATIONS OF 



long-winged individuals. A biometrical survey of the Gryllus of Mexico 

 would probably yield valuable information concerning the relation 

 between physiography and the taxonomic characters, as in Mexico we 

 find striking physiographic differences within a relatively small area. 

 The means and ranges of variation of the females of this collection 

 are given in table 78. 



TABLE IS. Cuernavaca, Mexico. 



Average. 



Body 19.13 



Tegmina 13.42 



Wings 22.60 



. ~~ 



Range. 



Posterior femora . 

 Ovipositor. 



12.22 

 16.02 



17.25 to 22.75 

 11.75 16.25 

 20.75 25.75 

 10.75 13.25 

 12.75 17.75 



DATA CONCERNING GRYLLUS IN GENERAL. 



The viewpoint here and the sources of the data are mentioned on 

 page 13. The seriations are given in table 79, the variation constants 



i i r*/\ 1.1 _ rr* _ _ J* _ .~1~4-I~,. ^ . *-.- 1^ 1 rt O1 TV-* V-.1 ^^. GO 4- ^ 



in table 80, and the coefficients of correlation in table 81. 

 93 give the details of the correlation data. 



TABLE 79 Interspecific variation curves. 



Tables 82 to 



TABLE 80. Interspecific variation constants. 

 [a., short-winged; l>, long-winged.] 



Body. 



M I a 17.877+0.:526 



Mean | /> 18.959+0.189 



Standard deviation., i 



Coefficient of var- \ a 

 lability / I) 



3.645+0.230 



Tegmina. 



9.719+0.274 

 13.119+0.137 



3.068+0.194 



3.379+0.133 2.4320.097 



20.394 1.34 

 17.8:2+0.73 



31.57+2.18 

 18.5340.76 



I'dsli rior 

 femora. 



Ovipositor. 



11.364-) 0.21013.151+0.361 

 12.259+0.136 14.741+0.224 



2.314+0.149 3.898+0.255 

 2 . 336 +0 . 096 3 . 920 +0 . 1 59 



20.36 H.3U 

 19.06 + 0.81 



29.64 * '.Ml 

 26.60+1.15 



