EPILACHNA. 



79 



s- 



height of the elytra in the basal region is low. The elytra are also a little 

 broader and the pronotum a little flatter. The ground-color is a lighter 

 yellow than that of E. borealis. It is desirable to find if this species does 

 not feed upon some other food plants than those of E. borealis. 



This species is named in honor of 

 Prof. W. L. Tower, of the University 

 of Chicago, whose experimental work 

 upon the genus is awaited with great 

 interest. 



Erilachna corrupta Mulsant. 



Distribution: Arizona, Mexico, and 

 New Mexico. 



Typical pattern: Spots 1 and 4 are 

 free from the suture and in place of 

 a large single apical spot are 2 smaller 

 ones placed well apart transversely. 



Form A. 



Mesal and intermediate spots of the inter- 

 mediate row narrowly confluent; 1 specimen and some intergrades. 

 Var. juncta, n. var. The two apical spots confluent; 1 specimen. 



The food plant is the bean. The larvae refused to eat cucurbit leaves 

 of several species. They were successfully reared, however, on bean leaves 

 at Cold Spring Harbor. The imagoes showed no modification there in the 

 direction of the pattern of E. borealis; in fact, a few showed a. slight 

 decrease in the amount of pigment. The attempt to hybridize them with 

 E. borealis was unsuccessful. 



Epilachna mexicana Guerin. 



Distribution: Mexico and adjoining parts of the United States. 



This species shows a reversed pattern, light spots upon a dark ground. 

 Living specimens could not be obtained nor enough dead ones to make a 

 study of the variation. 



FIG. 88. Variation in pronotal pattern of 

 EpUacHna boreafis exposed to -10 C. 



FIG. 89. Hpilachna loireri. ft, comparative 

 outlines of elytra from the side; solid line, 

 E. lower i: dotted line, E borealis; 6, color- 

 pattern of pronotum and elytra. 



