36 THE CANADIAN ENTOMOLOGIST. 



That year more than half of the cocoons received during the winter were 

 dead ; many of the larvae had but half changed, /. e., half was still larva, 

 the other half (generally the lower) had already changed to pupa, and in 

 most cases, with the larval skin still clinging about it, in a few partly split 

 open at the back, thus exhibiting the pupa in part. Some, in fact, thus 

 received were alive in that curious condition until spring ; very few of the 

 living pupae were of the proper size. The collectors had also much 

 trouble in gathering them. 



However, while Gloveri under such conditions did not thrive well in 

 Utah, ceanothi in California made splendid cocoons, and but very few, 

 comparatively, did not produce fine imagoes, while most of the Gloveri 

 that did hatch were crippled. 



This season, 1880, the weather seemed quite the reverse of 1879 ; the 

 atmosphere was more damp, and cocoons received during this winter from 

 Utah are very much larger, heavier and healthier in appearance than in the 

 former ; in several large lots received but very few were not good, and the 

 collectors in the winter of this season had less trouble in obtaining them 

 and were only prevented from gathering large quantities by the deep 

 snows occurring in Utah this winter. 



The change with ceanothi was this season again the reverse, as my 

 correspondents write me frosts occurred nearly every morning in those 

 portions of California quite late in the summer, the result being that 

 ceanothi was very late and also scarce, and the cocoons very much smaller 

 compared with the previous season, and many of these were no good. 

 Larvae received from Mr. Baron, arrived Sept. loth, were not half as large 

 as those I had raised here in a moderately tempered but well ventilated 

 brick building. 



Certam it is, however, that localities may be found in seasons of gen- 

 eral scarcity, in valleys or protected by surrounding hills or woods, where 

 certain species may be found in great abundance and in fine condition. 



With many experiments I have tried for three seasons, I am convinced 

 that cocoons of Gloveri should be kept in a cool place in winter (freezing 

 will not hurt them), or they will hatch cripples, if alive at all ; while 

 ceanothi should be kept in a place neither too warm nor dry, but not too 

 cold, until the spring season is well upon us. 



That Gloveri, ceanothi, Columbia and others of that family are originally 

 of one form, whether cecropia or some other species, I have no doubt ; of 

 course climatic and food changes, for many generations, as is well known 



