March, iSgS.] WEBSTER : DEVELOPMENT OF DRASTERIA ERECHTEA. 31 



tary, during the latter part of January, and as this was the only example 

 found and the date of finding corresponds so nearly with that of the 

 appearance of the remainder of the whole series, together with the fact 

 that there was hardly a possibility of a larva having been unintentionally 

 introduced from without, there is little doubt but that this was the imago 

 from the larva which had escaped from its breeding cage. It was very 

 similar to No. i, being about the same size, but somewhat darker in 

 color. The mother of the whole three being lighter and of the type of 

 No. 2. 



About October 10, 1896, Mr. Mally brought in from the fields three 

 larvae, seemingly nearly full grown, and these were placed on clover and 

 blue grass in a breeding cage in the insectary. " About October 22, all 

 three of these formed cocoons similar to the one shown in No. 4, which 

 is composed of three clover leaflets fastened together, while still attached 

 to the petiole, thus making a neat and deceptive case, having three quite 

 conspicuous angles. The weight of the pupa of course caused them to 

 turn downward, but even then they appeared like a drooping, withered 

 leaf, and for this reason very apt to be overlooked. One of these three 

 pupae was preserved for a cabinet specimen, the second died, while the 

 third transformed December 6, and is shown with cocoon in No. 4. 



Of two larvae brought in from the fields and placed in jelly cups 

 about October 21, one formed a very slight cocoon of silk as shown in 

 No. 5, and the other fastened blades of grass together, as shown in No. 

 6, notwithstanding both were supplied with grass for food, and hence 

 both had the same material from which to construct their cocoons. The 

 imagos both appeared December 18, 1896. 



The latitude of Wooster, Ohio, where these experiments were carried 

 on, is 40 48', while that of Carbondale, Illinois, where Professor 

 French studied the species, is about 37 45'. It will be observed that 

 with him the egg period was less than half as long as with me, while 

 with him the species developed in from 41 to 66 days from the egg, 

 the majority going from 48 to 53 days, with me this period varied from 

 107 to 115 days. The eggs which furnished the basis for his breedings 

 were deposited August 13, and those which I followed were deposited 

 on September 24 or 25. 



I am quite certain that, here in northern Ohio, the insect goes into 

 the winter in the larval stage, as I have observed nearly full grown larva? 

 crawling about after the middle of November, though hibernation may 

 also occur with pupse or even adults. In southern Ohio, I have ob- 

 served seemingly freshly emerged adults early in April. All of my 



