914 PARASITES OF GIPSY AND BROWN-TAIL MOTHS. 
Japanese Crossocosmia sericarre, which was the subject of the original 
investigations by Dr. Sasaki through which this peculiar habit was 
discovered. The full life of the fly from the deposition of the eggs to 
the issuance of the adult, some 10 or 11 months later, has been the sub- 
ject of a special series of investigations by Mr. W. R. Thompson, who, 
it is expected, will shortly publish the results of his studies. 
if It is worthy of note that the results of Dr. 
WT); By {| Sasaki’s observations have been abundantly 
Saw Sat) Si confirmed in very nearly every respect in which 
there is not an actual difference between the 
habits of Blepharipa and those of Crossocosmia. 
Each female fly is capable of depositmg sev- 
eral thousands of eggs upon the foliage of trees 
frequented by the caterpillars of the chosen 
host, but it is not known to what extent she 
employs discretionary powers in the selection 
of these trees. Presumably she is attracted 
Fic. 36.—Blepharipa scutellata: to those upon which the host caterpillars are 
ee es a Ganeee most abundant. Whether one sort of tree is 
more attractive to them than another is not 
known. The young larve hatching from the eggs which have 
escaped maceration by the mandibles of the caterpillars pass through 
the wall of the alimentary canal and immediately proceed to take 
full advantage of the physiological changes brought about in the 
host organism as the direct result of their presence. There are two 
larval ecdyses and three larval stages (as is the case with every other 
parasite of which the transfor- : 
mations are sufficiently well 
known to make any statement 
possible), and the manner of life 
undergoes a change with each 
ecdysis. 
The first-stage larva embeds 
itself in the tissues of the host, 
which apparently react in a man- 
ner somewhat suggestive of the 
reaction which results in the 
growth of a vegetable gall fol- Pe #0, Bes of Slptarips sua, showin 
lowing attack by a gall-making Pales pavida. Greatly enlarged. (Original.) 
insect. The drawings of these 
gall-like bodies containing the larve (fig. 38), as well as the drawings 
of the egg and of the second-stage larval “funnel” were prepared 
under the direction of Mr. Thompson as illustrations for his forth- 
coming paper. 
The second-stage larva undergoes a complete change in its manner 
of life, and its activities result in the formation of a tracheal “funnel,” 
& b 
