PARASITES HIBERNATING IN BROWN-TAIL WEBS. 267 
goes through two generations before the tachinid has entered its 
second stage. 
Table XI lias 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 Kntedon upon Pteromalus, wheD Pteromalus itself is hyperpara- 
sitic upon Apanteles or Meteoms. 
Tabi.k XI. — Poetibh interrelation* between parasite* hibernating in brown-tail eater- 
pi liars. 
Primary parasites. 
Pteromalus egragha 
A panicles 1 ae te i- 
Meteoius vcrsirolor 
Zygobothria nldj 
iul.1. 
Secondary super- or 
hyj>er-para*;ites. 
Monodontome r u s 
;ir»'l|s. 
Kntedon alhit arsis. 1 
Ttero rn aim egre- 
gmaJ - 
Mesoehorus pallipes. 
Moiiodonto in •• r u s 
a*reus.» 
\ | >a ii t e 1 1> s la< •»•!- 
eolor. 1 
Pte ro mains egre- 
gius.' * 
A pan teles laetei- 
color. 2 
\t. •Tunis v.TM. uldr -'. 
Monodont o nie r n s 
tereus. 1 
Pteromalus egre- 
pius.2 
Ted iary super- or 
h\|>er-parasites. 
Kntedon alliit arsis. 
Pterom a 1 u s egre- 
Pterom al u s egre- 
Kius.i 
Mcstx horus pallipes. 
Monodonto merus 
Tint. 1 
Kntedon alhitarsis.' 
Pterom a 1 us egre- 
gtOS.1 - 
.Mesoehorus pallipes. 1 
Mono<lonto in erus 
aureus. 1 
Pt ero in a 1 u s egre- 
gius.i 2 
Kntedon alhitarsis. 
(Quaternary super- 
or hyper-parasites. 
Kntedon all »it ar- 
sis. 1 
Kntedon all »it ar- 
sis.* 
Pteromalus e^r«>- 
gius.2 
Bntedon alhit ar- 
sis.' 
Pteromalus f^re- 
gius.2 
Kntedon alhit ar- 
sis. 1 
Qntnqotnary super- 
or hypea paraeiiofl. 
Bntedon alhitar- 
sis.' 
Do.' 
Ilyperparasitic relations. - Suj>e.-parasit ie relat ions. 
PEDK I l.OIDKS VKNTHICOSUS NEWP. 
During the winter of 190.8-9 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 female- were attached to the caterpillars of the 
