168 



PABASITES OF GIPSY AND BKOWN-TAIL MOTHS. 



Accordingly, in order that at least a rough idea of the quantity of 

 material handled at the laboratory may be had, Table VII, which, 

 without being absolutely accurate, is very approximately so, has 

 been prepared by Mr. R. Wooldridge, an assistant at the laboratory. 



Table VII. 



Table showing number of boxes received at the laboratory since beginning 

 of work. 





1905 



1906 



1907 



1908 



1909 



1910 







1 



923 



46 



117,259 



313 



1 



1,539 



87 



55,082 



1,159 



18 

 307 



17 



32,830 



160 



13 



32 



8,391 



1 



29, 295 



1,167 



21 



1 



Porthetria dispar larvae and pupae do 



Euproctis chrysorrhoea egg masses do 



131 



5,956 







29,696 



381 











63 













LOCALITIES FROM WHICH THE PARASITE MATERIAL HAS BEEN 



RECEIVED. 



Mr. Wooldridge has also prepared the accompanying map (fig. 11) 

 showing the various localities from which parasite material has been 

 received each year from 1905 to 1910, inclusive. It will indicate 

 the thoroughness with which the more accessible parts of the world 

 have been searched for parasites of these pests. 



THE EGG PARASITES OF THE GIPSY MOTH. 



Anastatus bifasciatus Fonsc. 



The first individuals of this species (fig. 12, female) were reared 

 at the laboratory in the spring of 1908 from eggs imported the pre- 

 vious winter from Europe and Japan. The dissimilar sexes were not 

 immediately recognized as of the same species, and for a few days 

 there was some doubt as to whether one, two, or four were represented 

 among the few scattering specimens emerging. The number was 

 soon reduced to two through the obvious attraction between the 

 sexes, and soon after to the one, when the senior author had an 

 opportunity to examine and compare series from European and 

 Japanese sources. 



Their issuance had been anticipated a long time before, and a 

 quantity of gipsy-moth eggs had been collected in the summer, 

 before embryonic development had progressed beyond its initial 

 stages, and placed in cold storage. It was thought possible that 

 some species of parasite might be reared from imported eggs during 

 the fall or winter which habitually and necessarily oviposited in unde- 

 veloped eggs, and it was hoped that those collected in the summer 

 might be kept fresh enough to serve as host material for laboratory 

 reproduction. 



