105 
larger of the two, averaging about 4.8 mm. at its widest point and 9.0 
mm. in length, nearly smooth, and black with a slight silky luster. The 
posterior pair of spiracles are set a little above the median lateral line, 
one on each side of a small but prominent cavity which is encircled by 
a rugose ridge. P. valida is a smaller species, the puparium (Pl. X, 
Fig. 41) of which measures about 4.0 mm. at its widest point, and 7.5 
mm. in length. It is dull black, coarsely punctate, being covered through- 
out with closely placed deep punctures. The spiracles are distant from 
the median lateral line and there is no trace of a cavity as described for 
undata. The adult flies are rather grotesque in appearance, being about 
as large as a medium-sized wasp, the head pointed at the apex and sub- 
triangular or conical, with prominent eyes, the thorax of the usual size, 
and the abdomen slender at the base but broadening apically, and narrow- 
Fic. 33. Pyrgota uwndata Wied., larva; a, Fic. 34. Pyrgota undata Wied., pupari- 
posterior end, showing posterior spir- um, (a) ventral and /b) lateral 
acles; b, one of the spiracles much view. 
enlarged. 
ing again in the female to a conical tip. The body and legs of undata 
are brownish, and the wings, excepting the posterior margins, are 
of the same color (Fig. 30), while in valida the body and legs are black- 
ish and the wings mottled with black (Pl. XI, Fig. 42). 
Pyrgota undata appears to be the more common of the two species 
and has been recorded from such widely separated localities as Quebec, 
(Canada), New Jersey, and Kansas. We have reared it from nine 
species of Phyllophaga, namely, P. bipartita, fervida (=arcuata), fra- 
