EPILACHNA. 



75 



TRIBE EPILACHNINI. 



Genus EPILACHNA Chevrolat. 

 Epilachna borealis Fabricius. 

 Distribution: Eastern United States. 



Type: Spots 1, 2, 3 + suture, 4, 5, 6 + suture, 7 (fig. 84, b) . 



Form spots 1, 2, 3 + suture, 4, 5 + 6 + suture, 7 (fig. 84, d) ; 6 in 156 = 4 per cent of 



females and 27 in 214 == 13 per cent of males at Cold Spring Harbor, New York. 

 Form spots 1, 2, 3 + suture, 4, 5, 6, 7; 3 per cent at Cold Spring Harbor (fig. 84, a). 



Form spots 1, 2 + 3 + suture, 4, 5, 6 -f suture, 7; 2 in 370 == 1 per cent at Cold Spring 

 Harbor. 



Form spots 1, 2 -f- 3 + suture, 4, 5 -f 6 + suture, 7; 1 per cent at Cold Spring Harbor. 

 Form spots 1 + 2 + 3 + suture, 4, 5, 6 + suture, 7; 1 per cent at Cold Spring Harbor 



(fig. 84, e). 

 Form spots 1, 2, 3 -f suture, 4, 7 + 5 -f-6 + suture; 1 per cent at Cold Spring Harbor 



fig. 84, fir). 



Form spots 1, 2, 3 -f suture, 4, 6 + suture, 6 + 7; 1 per cent at Cold Spring Harbor 

 (fig. 84,/). 



Fro;. 84, Variation of the elytra! pattern of E. horenlix. /< mode; a to a, from 



Cold Spring Harbor, N. Y. 



a 



/ 



FIG. 85. Variation in the pronotal pattern of E. borealis. 

 c=mode. <t to /, from Cold Spring Harbor, New York. 



Although not a color variation, 1 specimen with an emarginate pronotum 

 cephalad seems worthy of mention here. It did not appear in any way 

 pathological or traumatic. Intergrades are so numerous and the inherit- 

 ance of these forms is so imperfect that they do not deserve varietal 

 rank. No geographical differences are known in the range, except that it 

 has given way to its derivative, E. toiveri, in Texas and vicinity. The pro- 

 notum shows a wide range of variation in the amount of pigment (fig. 85) , 

 which the modification and heredity experiments given later show to be 

 largely the result of modification. There is, however, one distinct variety. 



Var. A. Lacks lateral pronotal spots; 1 per cent at Cold Spring Harbor (fig. 85, a). 



