Ze) 
glassy translucent, but the median or gut portion is pale orange 
with scattered white granules. During this first period it is an 
external feeder, its mouth being pressed against the body of its 
host.. Thus at this stage I was successful in transferring a 
Methoca grub from one larva to another. During about the last 
two days of its feeding life it develops a greater appetite and, 
inserting its head and the now curved portion of the thorax into 
its victim, rapidly sucks up the body juices. The wasp larva is 
now small-headed and slender, and the mid-gut is dark wine or 
brown color. It is full grown and ready to spin its cocoon in 
about five or six days, when it measures from ten to twelve milli- 
meters in length. (Fig. 34.) Even larvae which spin big cocoons 
do not always find it necessary to completely devour their large 
prey; in two cases observed the posterior third remained un- 
sucked, the cocoon later abutting on this mass. Methoca usually 
eat out at least the anterior portion of their prey, and when 
full-fed may sometimes be seen with the head within that of the 
hollowed Cicindela, waving vigorously. 
The following are notes on the growth of a single Methoca 
larva: 
October 26, 
October 27, 
October 28, 
oO 
athyca im. latched: 
pe imc Length, 1esO) nim, 
peem.2~ Wbenethy .3.50) mm: 
NT bo BS BDO DO 
io) 
October 29, ms. length, 7.10 mms 
@ctober 30; 2p. m.: Length, 10:00) mm: 
October 31, 7 a. m.: Beginning to spin. 
The cocoon (Fig. 36) varies in length from eleven to seventeen 
millimeters, and is from about three to four and a half millimeters 
in diameter. Abnormally small ones occur. As can be seen from 
the figure, the cocoon tapers to more or less of a point posteriorly, 
while anteriorly it ends in a sort of calyx or collar. In spinning 
the cocoon a rather flimsy outer env elope with a wide flaring 
mouth is made, and within this the more compact inner cocoon, 
with a constriction to mark the base of the collar, is spun, this 
collar being united along its edge with the thin, flaring mouth. 
Within the calyx or cup may often be found the chitinized por- 
tions of the Cicindela larva. The cocoon is of a light brown 
color. Larvae placed in a narrow clay trough spun perfect co- 
coons, which, as they consist of many well-separated layers of 
silk, require considerable time for their completion. The wasp 
bites its way out through the base of the calyx. 
I have seen only the female pupa, (Fig. 35). It is whitish, not 
quite as slender as the adult, but of about the same length. It 
