9 
upon a large number of lepidopterous larvie, feeding upon such Bomby- 
cids as Clisiocampa and Orgyia, upon certain Phycitids, Tortricids, and 
large-sized Tineids. It was by far the most abundant of the parasites 
reared, no less than 1,659 having issued in the course of our observations 
upon the parasites of Orgyia leucostigma., 
Observations were first begun on August 31, 1895, at which time five 
eges were noticed upon a larva which had spun its cocoon and had died 
without transforming to pupa. Two similar eggs were found upon 
another caterpillar under like conditions. A few days later many more 
were found. They were generally attached to the dorsal portion of the 
abdominal segments of the caterpillar and usually at the juncture of 
two segments and always set up on end, attached by the small end. 
They were not firmly attached and were occasionally rubbed off by the 
contortions of the larva, being retained, however, by the silken threads 
of the cocoon. 
Fic. 1.--Pimpla inquisitor: a, full-grown summer larva; 6, hibernating larva; ¢, mouth-parts of larva; 
d, adult female; ¢, abdomen of adult male from side—all enlarged, ¢ greatly enlarged (original). 
These eggs are much elongated, somewhat wider at one end than at 
the other, pure white in color, and perfectly smooth, appearing highly 
polished. The average length is 0.98. mm. and the greatest width 
0.18 mm. The duration of the egg state must be very short and proba- 
bly a matter of but a few hours. After hatching, the larvee were found 
to feed externally upon the body of the caterpillar, the mouth parts 
closely applied to the skin, and, in fact, obviously sucking blood 
through a minute orifice. Their growth was rapid and there was no 
perceptible exuviation. The seven eggs found on August 31 had 
hatched the following day and by September 3 the larvie appeared to 
be nearly full grown. When full grown, the largest larve are 9.5 mm, 
in length by 3.2 mm. in greatest diameter, fusiform in shape, and 
slightly curved in normal position. The color is yellowish white, some 
specimens taking on a pinkish tinge, and there are no markings. The 
