104 
The eggs are elliptical, measuring .05 mm. by 1.2 mm., and pure 
white (Fig. 32). Counts of eggs in the bodies of two specimens of P. 
undata, made May 29, 1913, gave 54 and 98 respectively. The length of 
the egg stage has never been determined by us, but it is probably only 
five or six days, since the beetles are killed by the maggots within ten 
days or two weeks after being attacked, and the average length of the 
egg and larval stages combined is about three weeks. Before succumb- 
ing to the attack of the parasitic larva the beetle enters the earth to a 
depth of two to six inches, and within the abdominal cavity of the host 
the larva pupates and remains as a puparium until the following spring. 
Occasionally some of the tachinid parasites issue in the summer of the 
same year in which they pupate, but this never occurs with Pyrgota, 
and we have never found more than one Pyrgota developing within the 
same host. Rarely the Pyrgota remains in the puparium stage over two 
winters. In one case a male P. futilis caged June 12, 1916, was found 
to contain a parasitic larva June 27, this larva forming the puparium 
Fic. 31. Pyrgota undata Wied., Fic. 32. Pyrgota undata Wied., 
ovipositor extruded. egg, much enlarged. 
shortly thereafter, and although other parasites of the same species and 
from the same lot issued in the spring of 1917, one remained over the 
second winter and issued as an adult female P. undata May 11, 1918, 
about two years after it was first observed in the host. The larva (Fig. 
33) is white and very robust, and in this respect might be likened to 
some of the larger nut-weevils. The puparia of the two species (Fig. 
34, and Pl. X, Fig. 41) are quite distinct and readily recognized. ‘They 
are alike in shape, being broadly ovate, noticeably thicker and broader at 
the rounded anal end, the anterior end being pointed, but differ in size, 
texture, and posterior spiracles. The puparium of P wndata is the 
