DEVELOPMENT OF COPIDOSOMA GELECHI/E. 34! 



do not come out at the same time. The single instance of six 

 females ssuing simultaneously with the brood of Copidosoma 

 can be explained by assuming that a single female deposited six 

 fertilized eggs in the host at the same time. However, this case 

 is of special interest as it demonstrates the synchronous develop- 

 ment in a single host of the broods of two distinct parasites, and 

 thus supports Wheeler's ('10) suggested explanation of Silvestri's 

 so-called asexual larvae in Litomastix. 



In addition to the five hymenopterous parasites, there are two 

 insect larvae associated with the larva of G. salinaris. They are 

 undoubtedly inquilines. One of these is a beetle and the other a 

 lepidopterous larva (Fig. 5). Judging from Riley's account, 

 these two species are very similar to if not identical with the cor- 

 responding inquilines reported by him for the galls of G. galltz- 

 solidaginis. 



IV. DEVELOPMENT OF COPIDOSOMA GELECHI^:. 

 i. The Poly germ Stages. 



(a) Youngest Stages. We have not secured the cleavage 

 stages of Copidosoma, owing to the fact that they occur earlier in 

 the year than we have been able to reach Woods Hole. There- 

 fore, in describing the developmental processes which have their 

 inception in the cleavage stages, we must rely upon the work of 

 other investigators in this field for our interpretation of the sig- 

 nificance of these processes. 



The youngest stages secured were found in a small larva of 

 Gnorimo schema, taken June 21, 1913. The series of sections of 

 this small caterpillar contains three young polygerms of Copi- 

 dosoma. Evidently the egg from which the caterpillar developed 

 had had three parasitic eggs deposited in it. Two of the poly- 

 germs, which lie close together, are situated in the first and 

 second body segments of the larva, just beneath the hypodermis; 

 while the third is found in sections 5 to 14 posterior to these, and 

 is also situated just beneath the hypodermis of the host. 



The three polygerms are not of the same size, as is indicated 

 by the following measurements : Of the two specimens lying close 

 together, the larger measures 150^1 by 82 /JL and runs through 

 15 sections (150 /*), the smaller measures 103 n by 71 fj., and is 



