PROCKKDINQS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



VOL. VI, PP. 203-332. [Fics. 1-81.] DECEMBER 14, 1904. 



STUDIES OF VARIATION IN INSECTS. 



BY VERNON L. KELLOGG AND RUBY G. BELL, 

 OF LELAND STANFORD JUNIOR UNIVERSITY. 



CONTENTS. 



Introduction. 



Data of variation in twenty-four insect species. 



Variation in the venation and costal wing hooks in Apis mellifica ( the 

 honey bee), drones (males) and workers (females) 212 



Variation in the venation of costal wing hooks of male black ants .... 244 



Variation in the venation of Culex incidens and Grabhamia currtei (mos- 

 quitoes), males and females 253 



Variation in the elytral pattern and prothoracic pattern of Hippodamia 

 convergens (the convergent lady-bird) 257 



Variation in the elytral pattern of Diabrotica soror (the California flower- 

 eating Diabrotica} . . . . 273 



Variation in the abdominal pattern and face spots of Vespa sp. (yellow- 

 jacket) u ; . . 282 



Variation in the prothoracic pattern of J^ettigonia sp. (leaf hopper) . 287 



Variation in the prothoracic pattern of a flower-bug 291 



Variation in the prothoracic pattern of Corisa sp. (water-boatman) . . 293 



Variation in number of eye-spots on the wings of Parnassius smintheus 

 and Coenonympha galactinus (butterflies) 295 



Variation (regenerative) in number of tarsal segments of Periplaneta 

 americana (American cockroach), adult and immature 296 



Variation (absent) in number of tarsal segments of Largus cinctus, Ana- 

 brus simplex, Eleodes sp. and Melanoplus femur-rub rum 300 



Variation in number of tibial spines of Afelanoplus femur-rubrum (red- 

 legged locust) 301 



Variation in number of tibial spines of Cicada septendecim (seventeen- 

 year Cicada ) . . . ..." 306 



Variation in actual and relative length of antennal segments of Ceroputo 

 yuccce ( ?) (scale insect) ....... ......... . . 310 



Variation (absent) in number of antennal segments of Eleodes sp. and 



Vespa sp 313 



Proc. Wash. Acad. Sci., Dec., 1904. 203 



