74 THE CANADIAN ENTOMOLOGIST. 



On the 25th, they began to lose the bright golden green, changing to 

 a dull yellowish green. As the bright green disappeared, the black top 

 of the head became visible through the thorax, showing the double anterior 

 spot of the form ^punctata. On dissecting specimens and removing the 

 head, I found that the anterior spots are transparent, while the posterior 

 spots being opaque, are not affected by seasonal changes of colour. In the 

 nuptial dress the anterior spots are concealed by the bright green, giving 

 a three-spotted form (helianthi), but in the fall dress the black top of the 

 head is seen through the transparent spots, producing the form ^-punctata. 

 On June 12 th, I again visited the colony, and found several couples 

 paired, Many of the females were gravid, but no eggs were found. All 

 the beetles were in the nuptial dress. Visited it again on June 19th, with 

 the same result. On June 26th, I tried again and found several groups 

 of young larvae, showing that I must have overlooked the eggs, although 

 I had searched carefully for them. Some of the larvae had moulted and 

 the cast skins were on the leaves. As the larvae were of two sizes, eggs 

 had probably been deposited a week or two previous. All the larvae were 

 on the under surface, but had eaten holes through the leaf by which their 

 presence could be easily detected. These young larvae are of a paler 

 green than when full grown, and the yellow stripes are not so bright and 

 are broken up into spots, giving them a grayish appearance. Their pres- 

 ence on the under surface of the leaf, near its extremity, gave me a clue 

 to the whereabouts of the eggs, and after a little further search I succeeded 

 in finding them. They are deposited in an irregular cluster attached to 

 the under surface of the leaf, about half an inch from the tip, just where 

 it tapers off. The egg cluster is just the width of the narrow portion of 

 the leaf, and is about the size of a pea. In general appearance it closely 

 resembles a gall. In shape it is roughly pyramidal, the base being 

 attached to the leaf. Its colour varies from green to pinkish brown, the 

 colours generally appearing in blotches. The eggs are arranged in hori- 

 zontal layers lengthwise with the leaf, the number decreasing to the apex. 

 They are of a greenish white colour, elongate oval, smooth. They adhere 

 strongly to each other and are surrounded by a tough covering or envel- 

 ope, no doubt exuded by the female. The eggs are not so firmly attached 

 to the enveloping substance as to each other, and can be detached with a 

 little care. One cluster that I counted contained twenty-three eggs, and 

 this, I think, judging from the groups of young larvte, would be about the 

 general number. When emerging, the larvae either work their way out 



