THE CANADIAN ENTOMOLOGIST 307 



belief that the species was erroneously described as a parasite of 

 Icerya purchasi and is in reality a true parasite of Chrysopids. 



Certain studies of red-spider predators were conducted at Bates- 

 burg, South Carolina, during the season of 1913, and it was noticed 

 that a considerable percentage of the Chrysopas were parasitized. 



In order to determine the approxi- 

 mate percentage of parasitism of 

 these very beneficial insects Mr. F. 

 2 L. McDonough, of the Bureau of 

 Entomology, and the writer, col- 

 lected a large series of cocoons from 

 JlllfcL-.^ cotton plants growing in the fields. 

 Adults from these cocoons were 

 c /^&B$L^' reared in the laboratory under con- 



ditions as nearly normal as possible. 



Fig.26— Apical porti an of cotton phnt, shw- t, • wr . rf -U rPrr , r Hi n n- m'nrP 



ing the characteristic location of *l IS WOrtn recording, blllLt 



Chrysopid cocoon at C wg haye neyer not [ ce ^ ft m pr int, 



that the Chrysopas in cotton fields pupate very characteristically 

 in the apical buds at the very terminal portion of the stalk. The 

 pubescence of the nascent foliage at this point is densely concen- 

 trated and of a grayish appearance, thus approximating the texture 

 of the cocoon and affording considerable protection for it. This is 

 shown in the accompanying figure. Of course, occasional cocoons 

 are found in other locations, as, for example, within the involucral 

 bracts of "squares" or in the convolutions of leaves. These are 

 exceptions. 



All of the several lots of Chrysopid cocoons collected were 

 observed daily until they either produced adults or parasites, or 

 until they clearly indicated that they were not going to give issue 

 to anything. The final summary of results from this detailed 

 study — in the case of the largest lot — is shown in Table 1. 

 Table I. — Estimated Parasitism of Chrysopids. 



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1 Chrysopid cocoons observed "" 



I Cocoons yielding Chrysopids ,r >l 



j Cocoons yielding parasites 48 g 



1 Percentage of parasitism 48.4% | 



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A lot of about 100 bred Chrysopids were determined by Mr. 



