PARASITES OF GIPSY-MOTH PUP. 249 
The egg which is figured (fig. 52) was dissected from a female which 
was imported in 1909 with cocoon masses of the brown-tail moth and 
which was evidently hibernated. She was given no opportunity to 
oviposit. In 1910 several females were collected in the open in June, 
and these, upon being supplied with fresh pup of the brown-tail 
moth, immediately oviposited. 
The very characteristic larve (fig. 53) feed externally upon the 
pup of tachinids within the puparium, but 
internally within the pupe of Lepidoptera. 
The pupe (figs. 54, 55) are also characteristic, €& 
and the appearance of that of the female 1s We. 52—Monodontomerus 
indicated by the accompanying Ulustrations. 27s: Egg. Greatiy en- 
larged. (Original.) 
The exit hole (fig. 56) left in the gipsy-moth 
pupe is invariably smaller than that left by Chalcis, and lar ger than 
that of Diglochis. It may be located anywhere, in which respect it 
differs from any of the larger of the pupal parasites. 
As a secondary parasite, Monodontomerus has been reared from 
tachinid puparia upon numerous occasions both from those which 
have been received from abroad and from those collected in America. 
It was rather expected of it that its attack would be confined to those 
bf Fig. 55.— Monodonto- 
Fig. 54.— Monodontomerus merus zreus: Pupa, 
Fig. 53.— Monodontomerus zreus: Pupa, side view. ventral view. Great- 
zreus: Larva. Greatly Greatly enlarged. ly enlarged. (Orig- 
enlarged. (Original.) ( Original.) inal.) : 
which were immediately associated with one or another of its chosen 
hosts, but as usual it did the unexpected, and it has been reared from 
Compsilura puparia which were collected at the base of trees upon 
which the caterpillars of the gipsy moth had been common. It has 
also been reared from tachinids parasitic upon the tussock moth (and 
from the tussock moth as a primary parasite), from the tent cater- 
pillar, in which it was apparently parasitic upon Pimpla, and from 
the cocoons of Apanteles lacteicolor Vier., the imported brown-tail 
moth parasite. Like another anomalous species, Pteromalus egregius, 
PN se OO 
