PARASITES OF LARGER BROWN-TAIL CATERPILLARS. 301 
agemenl to the attempts which have been made, and which will be 
renewed, looking toward the establishment here of others havim: a 
somewhat similar distribution. 
Pales pavida (fig. 70) is perhaps as promising as any among these, 
although it is possible that it appears so on account of a somewhat 
larger knowledge which we possess concerning its life and habits. It 
was firsl imported in not very Large numbers in L906. In 1 907 about 
as many were secured and colonized as of the successfully introduced 
Zygobothria, and more were colonized in 1909. The fact that it 
has not been recovered is by no means to be taken as positive asssur- 
ance that it is not established, and it is well within the bounds of 
possibility that it will he recovered in 1911 or 1912. 
It is one of the species 
which deposits its eggs 
upon the leaves to be 
eaten by its host (fig. 36, 
p. 214) and was t he first 
species having this habit 
to be carried through all 
of its transformations in 
the laboratory. In 190S 
Mr. Townsend succeeded 
in carrying some of the 
flies through the period 
allotted h>i- the incuba- 
tion of their eggs, but he 
did not succeed in secur- 
ing oviposition. In 1 909 
Mr. Thompson had better 
fortune, and not only se- 
cured eggs in abundance, 
but fed these eggs to a variety of caterpillars and secured either the 
puparium or the fly in nearly every instance, lie also secured much 
interesting data upon the early stages, and upon the life and habits 
of the early stages, a story of which is left for him to tell. The 
accompanying illustrations of the eggs and larva 1 were prepared 
under his direction. That of the egg (fig. 37, t>. p. 214) is of inter- 
est in comparison with that of the egg of Blepharipa scutellata (fig. 
37, a, p. 21 I), as showing the difference in the characteristic micro- 
scopic markings. That of the larva will give a good idea of the 
integumental "funnel" (figs. 71, 72), formed by the ingrowing epi- 
dermis, as differing from the tracheal "funnel" characteristic of the 
Larva of Blepharipa, as figured on pages 215 and 216. 
Fig. lO.—Palts pavida: Adult femal>», with front view of head 
above and side view below, and antenna at left. Much en- 
ttbttged. (Original.) 
