THE CANADIAN ENTOMOLOGIST. 175 



line (band) with red running through it, as had the one that changed to 

 the chrysahs which I last sent you." 



I happen to be feeding now two mature larvje of Eurytheme from 

 eggs sent from Colorado by Mr. D. Bruce, and these vary as does 

 Hagenli. One has a mere trace of sub-dorsal band — a line ; the other a 

 continuous yellow band one-third the width of the white basal band, and 

 with no red or black about it.* 



As will have been seen, I have been under great obligation to Mr. 

 Nash for the interest he has taken in these experiments, and the aid he 

 has rendered in these four years. If I have succeeded in raising ten 

 broods from eggs to imago, I have failed in as many more, from one 

 cause or other, principally, howeVer, the destruction of either eggs or 

 young larvae in the mail, owing generally to the summer heat in 

 transit, but the trouble to Mr. Nash was all the same. In spite of mis- 

 cairiages he persevered in obtaining and forwarding eggs, and felt as 

 anxious as I did rt) establish the true position of this form Hagenii. 



I lost some of the first of the broods by disease which attacked either 

 larvae or chrysalids, sometimes destroying every example of one or other. 

 This led me to give up breeding in glasses for this species, and try the larvae 

 on clover growing in pots. I kept half a dozen pots ready, with a sod of 

 white clover in each, and when young larvae were received placed them on 

 the leaves, and covered the whole with a muslin bag. When the leaves 

 were much eaten, the larvae were transferred to a second pot, and so on to 

 maturity. In this way I have avoided disease completely, and it 

 was little trouble to take care of the larvae, beyond getting the pots 

 ready. White clover is preferable to red, I find for such purpose, as 

 being low growing with smaller leaves. Many species of Colias also deci- 

 dedly prefer white to red clover. The same mode of treatment has been 

 successful with other species of Colias. It is necessary to watch for small 

 spiders, which may be on the plant, but I do not often lose larvae from 

 this cause. Of course I intend in due time to give one, and perhaps two 

 plates to Hagenii, after I have learned all I can about its dimorphism. 



* These larvfe have since writing the above produced Eurytheme, the one with 

 yellow s. d. band an orange male. 



