NO. 2192. DRAOONFLIES, CALIFORNIA AND NET ADA~ KENNEDY. 569 



The sum of the equivalents, then, gives the variational standing of 

 the individual. That is, a sohrinus with each character of extreme 

 sohrinus form would total 70 and a donneri with each character 0, 



309 311 



Figs. 309-310.-Gomphtjs donneri. 309. Curve representing about 50 specimens. 310. Same curve 



as 309 reduced to periods of 10. 

 Figs. 311-312.— Gomphus sobrinus. 311. Curve representing about 50 specimens. 312. Same 



CtJRVE as 311 reduced TO PERIODS OF 10. 



or the extreme donneri form, would total and a perfect intermediate 

 would total 35. Figures 309 and 311 are curves representing the 

 two species and figures 310 and 312 are these same curves redrawn 



Fig. 313.— Gomphus sobrinus, variations in the anal area in the male hind wings. 



to groups of 10 to smooth them up. These curves show better than 

 words the distinctness of the two species. 



I am not familiar enough with the genus Gomphus to attempt to 

 place these species m a subgenus. 



