PARASITES HIBERNATING IN BROWN-TAIL WEBS. 



267 



goes through two generations before the tachinid has entered its 

 second stage. 



Table XI has been prepared for the purpose of showing these inter- 

 relations graphically. It is to be understood, of course, that not 

 in every instance have the exact relations thus set forth been actually 

 observed; but it is perfectly safe to say that they are not only within 

 the bounds of probability, but that they actually occur in nature. 

 The only point concerning which doubt is felt is in the hyperparasit- 

 ism of Entedon upon Pteromalus, when Pteromalus itself is hyperpara- 

 sitic upon Apanteles or Meteorus. 



Table XI. — Possible interrelations between parasites hibernating in brown-tail cater- 

 pillars. 



Primary parasites. 



Secondary super- or 



Tertiary super- or 



Quaternary super- 



Quinquinary super- 



hyper-parasites. 



hyper-parasites. 



or hyper-parasites. 



or hyper-parasites. 



Pteromalus egregius 



Entedon albitarsis. 1 









Apanteles lactei- 



Pteromalus egre- 



Entedon albitarsis. 1 







color. 



gius. 1 2 











Mesochorus pallipes. 2 



Pteromalus egre- 

 gius. 2 



Entedon albitar- 

 sis. 1 







Monodonto m e r u s 











aereus. 2 









Meteorus versicolor. 



Apanteles lactei- 



Pteromalus egre- 



Entedon albitar- 







color. 2 



gius. 2 



sis. 1 









Mesochorus pallipes. 1 



Pteromalus egre- 

 gius. 2 



Entedon albitar- 

 sis. 1 







Monodonto m e r u s 











aereus. 1 









Pteromalus egre- 



Entedon albitarsis. 1 









gius. 1 2 









Zygobothria nidi- 



Apanteles lactei- 



Pteromalus egre- 



Entedon albitar- 





cola. 



color. 2 



gius. 1 2 



sis. 1 









Mesochorus pallipes. 1 



Pteromalus egre- 

 gius. 2 



Do. 1 







Monodonto m e r u s 











aereus. 1 









Meteorus versicolor 2 . 



Pteromalus egre- 

 gius. 1 2 



Entedon albitar- 

 sis. 1 







Monodont o m e r u s 











aereus. 1 











Pteromalus egre- 



Entedon albitarsis. 1 









gius. 2 









Monodontome r u s 











aereus. 











Hyperparasitic relations. 2 Superparasitic relations. 



PEDICULOIDES VENTRICOSUS NEWP. 



During the winter of 1908-9 trouble was experienced in the work 

 of breeding Pteromalus, the exact nature of which was not imme- 

 diately apparent. There were numbers of the reproduction experi- 

 ments in which the proportionate number of progeny to parents used 

 was much below that which had hitherto been' secured as the result 

 of similar work in the previous spring. An examination of the nests 

 of the brown-tail moth which had been used in these experiments 

 disclosed the presence of vast numbers of the adults and young of a 

 mite, determined by Mr. Nathan Banks as Pediculoides ventricosus 

 Newp. The gravid females were attached to the caterpillars of the 



