VARIATIUX AND MITATION 



133 



answer by calling attention lo Figs. 72, 73, and 74 and what 

 these variations signify. Note also Fig. 75, showing the 



Fig. 73. — Diagram showing variations in elytral pattern of convergent ladybird. 

 Hippodamia convergens: 1-5, Variations by different reduction in number of spots 

 in the two elytra; 6-9, variations by conditions of spots. (After Kellogg and Hell.) 



variation in elytral blotching to be found in a series of individ- 

 uals of the California flower beetle, Diabrotica soror: see also 

 Fig. 76, showing the vari- 

 ations in the black and 



B 



© 



Q 



yellow color pattern of the 

 abdomen of the common 

 yellow jacket {Vespa sp.); 

 and Fig. 77 showing the 

 variation in the pattern of 

 the prothorax in a series of 

 178 individuals of a common 

 Californian flower bug, all 

 the£3 individuals collected 

 at one time by sweeping a 

 net over a few rods of alfalfa 

 and Baccharis on the campus 

 of Stanford University. 



These are all color and 

 pattern variations; but in- 

 sects show variations in structural parts as well. Fig. 7S shows 

 a common red-legged locust and one of its hind tibiie enlarged 

 10 





FiQ. 74. — Diagram showing variation."* in 

 prothoracic patterii of the convergent 

 l;i<i.\"bird, If ij>i><H/(inii(i convergens. (.-Vfter 

 Kellogg ami Hell.) 



