BOSTON ZOOLOGICAL SOCIETY. 29 



iiiiieh loiioer it would have continued in tlie larval state is 

 a question 1 cannot now answer. 



The finding of the Codling-moth larva in Noveud)er led 

 me to make an examination of some pupa cases of the Squash- 

 vine ^geria, ^geria cucia^bita^, and 1 found the larvae 

 unchanged. I opened some cases from time to time in 

 December, January and February. Tn April I opened 

 the last case I had to use and no change had occurred up to 

 that time. Of course it would be impossible to tell when 

 the larvae become pupa^ unless one had a large number and 

 could make the examinations often up to the time of the 

 change. 



As far as I have been able to determine there is but one 

 brood of these caterpillars in a season, but the eggs are 

 laid upon the vines at different times, as might be inferred 

 from finding larv^ in all stages of growth at the same time 

 in the same vine. This would indicate either that the ima- 

 go appears at different periods or that the time in which 

 the moth works is quite extended. 



The larvae of Arctia isabeUa are black in their early 

 stages, but after the second moulting one red ring appears 

 — the middle one — and one more at each successive moult, 

 first forward, then back of that earliest appearing, until the 

 normal number is reached when no more moultings take 

 place. 



Sometimes the mature larvjie have but two I'ed rings; 

 sometimes but two red tufts in each of the two middle 

 rings, or even only three red tufts in all. Again they appear 

 wholly red except a black tuft at each extremitj % or one at 

 the head, and two at the caudal segment. As nearly as 

 I am able to determine now, these very different forms pro- 

 duce moths differing in their markings. 



