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 interrelationsebetween parasites hibernating in brown-tail cater- 
pillars. 
Secondary super- or Tertiary super-or | Quaternary super-  Gatteeaieere super- 
Primary parasites. hyper-parasites. hyper-parasites. or hyper-parasites. | or hyper-parasites. 
Pteromalus egregius 
Apanteles lactei- 
color. 
Meteorus versicolor. 
Zygobothria nidi- 
cola. : 
Monodontomerus 
eereus. 
| Monodontomerus 
| Pteromalus egre- 
Entedon albitarsis.1 | 
Pteromalus egre- | 
ius. 12 
Mesochorus pallipes.? 
Monodontomerus 
eereus.? 
Apanteles lactei- 
color.? 
Pteromalusegre- 
gius.1 2 
Apanteles lactei- 
color? 
Meteorus versicolor 2. 
eereus.! 
gius.? 
1 Hyperparasitic relations. 
Entedon albitarsis.! 
Entedon albitar- 
Pteromalus egre- 
sis.} 
gius.? 
Pteromalus egre- 
gius.? sis.} 
Mesochorus pallipes.!} Pteromalus egre- 
gius.? 
Monodontomerus 
eereus.! f 
Entedon albitarsis.! 
Pteromalus egre-| Entedon albitar- 
gius.! 2 sis.1 
Mesochorus pallipes.!| Pteromalus egre- 
gius.? 
Monodontomerus 
zreus.! 
Pteromalus egre- Entodom albitar- 
gius.1 2 sis.1 
Entedon albitarsis.! 
Entedon albitar- | 
Entedon 
sis.t 
Do.! 
2 Superparasitic relations. 
PEDICULOIDES VENTRICOSUS NEWP. 
albitar- 
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 
’ 
