33 



the eg'g.s. The parasite was watched for the next half hour, during- 

 which time it oviposited in fifteen eggs. Does the parasite ride around 

 on the butterfly, waiting for oviposition ? 



ON THE OVIPOSITION OF CACCECIA CERASIVOEANA 



By Clarence JNI. "Weed, Dw-Jmm, N. H. 



[Abptract.] 



The eggs are laid in flattened masses on the bark of chokecherry 

 shrubs ver}' near the ground. The egg mass at first is yellow, l)ut 

 later it becomes brownish, so that it is very difiicult to distinguish it 

 from the bark. There is but one brood of larvte a year, the eggs laid 

 in summer remaining unhatched until the following spring, then the 

 young larva? crawl to the top of the shrub, where they begin the con- 

 struction of the tent. 



The next paper was entitled: 



THE RELATIONS OF PIMPLA CONaUISITOR TO CLISIOCAMPA 



AMERICANA. 



By Clarence M. Weed and William F. Fiske. 



[Abstract. ] 



Pimjpla conquisitor is the most important hymenopterous parasite 

 attacking the pupa of Clmocanipa americana. The eggs are com- 

 monly laid in the cocoon of the host soon after its construction, and 

 several experiments conducted with a view of ascertaining the inva- 

 riability of this rule go to show that exceptions are at least rare. 

 The development of the parasite from the egg takes but little more 

 time than that required for the completion of the metamorphosis of 

 Clisiocampa after constructing its cocoon, so that their respective 

 dates of emergence are not far apart. The pupa shell of the host is 

 completely filled by the larva of its parasite when the latter is full 

 grown, but after the discharge of the semisolid meconium it is 

 •scarcely half as large as before. 



The lar\a' of Pimpla are attacked when nearly or quite full grown 

 by a secondary parasite, TJieronia fulvesce7i8^ the larvse of which feed 

 externally upon their host and finally replace it. The various stages 

 of this species from the first have been observed and many speci- 

 mens reared. It is about two weeks in reaching maturity from the 

 egg. A peculiar fact noticed in the observations upon this species 

 is that in the first stage from the egg the minute larva has a hard chi- 

 tinous head with large jaws, a feature totally lost in the succeeding 

 molts. 



6878— No. 26 3 



