228 THE CANADIAN ENTOMOLOGIST. 



to emergence of the butterfly is from 15 to 17 days. The only food plant 

 known to me is the Hackberry, Celtis occidentalis, and the eggs seem to 

 be nearly always laid on the tender terminal leaves of the branches. By 

 frequent cutting in some trees in my garden I have made them close headed 

 and low, and I never look over them at the proper seasons that I do not 

 find eggs or larvae of Bachmamii. Usually one egg is laid at the end of 

 a branch, in one of the forks, on the leaf stem, but I have seen two 

 eggs on same stem, and occasionally an egg laid on the under side and 

 middle of a leaf. The young larvje on hatching ascend to the extremity 

 of one of the leaves and remain there, stripping the sides, leaving the 

 midrib untouched, whence it is easy to find them. They eat their way out 

 of the egg a little below the tip, but do not eat the egg shell after emerg- 

 ing, and the empty shell has often guided me to the whereabouts of the 

 . young caterpillar. In all stages these 



\ jl / larv^ when at rest arch the anterior 



segments, in the attitude of a Sphinx. 

 When ready to transform they spin 

 buttons of red silk upon the under side 

 of a leaf — chrysalid shells being occa- 

 sionally discovered in such positions- 

 suspend after the manner of the Nym- 

 '^" '^' phalidse, and in about eight hours 



pupate. I have noticed no variation in the colors ot the larva in any 

 brood but the last one of the year. 



As Bachmanin (fig. 13) has been taken in Ontario, it would be well 

 worth while if some lepidopterist there would seek for its eggs or larvae 

 on Celtis occidentalis, and determine the number of annual generations. 



I subjoin notes from my journals of times of appearance and finding 

 of eggs and larva : 



1873. Between 25th April and 15th May, a worn female taken during my 

 absence from home ; this was evidently a hibernator. 



ist Brood. 



1873. nth June, fresh females flying, set one for eggs. 



1880. 13th June, found 8 larvae in younger stages. 



1881. 25th June till 9th July, found eggs and larvae daily ; first butterfly 

 emerged 19th July. 



