84 
In all cases known to us where this species has attacked grubs the 
percentage of infestation has been marked. For instance, in one lot of 
grubs collected by Mr. Smith at Chelsea, Vt., over 35 per cent. were 
infested by it, while more than 10 per cent. of our Austin, Tex., collec- 
tion showed Ptilodexia parasitism, and over 45 per cent. of the Aphonus 
grubs collected by Caffrey and Barber at Maxwell, N. Mex., September 
7, 1916, were parasitized by this species. These few examples indicate 
the importance of this parasite in Some sections. 
The fly, which has rather remarkably long legs, is well shown in 
Figure 16, and Plate VII, Figure 25, and the larva and puparium, as 
well as the characteristic posterior spiracles, are shown in Figures 17 
and 18. 
Fic 18. Ptilodexia harpasa Walk., puparium; a, posterior end, showing posi- 
tion of posterior spiracles; b, the spiracles, much enlarged. 
PTILODEXIA ABDOMINALIS Desv. 
This species’ and the following one are here recorded as parasites 
of Phyllophaga on the authority of Mr. Norman Criddle, whose notes 
are here given through the courtesy of Dr. C. Gordon Hewitt : P. ab- 
dominalis* was reared from larvae of Phyllophaga rugosa collected in 
Manitoba. The larvae entered the earth to pupate after killing the 
grubs as does P. harpasa, and the two examples reared, issued August 
31 and September 1, 1915, respectively. 
This dexiid has heretofore been recorded in literature only from 
Nova Scotia. 
Myocera CREMIDES Walk.? (of authors). 
Mr. Criddle reared a-number of individuals of this species, six or 
more issuing July 7 from a grub of Phyllophaga anxia or P. nitida, 
* Determined by J. D. Tothill. 
7 This species is listed in Aldrich’s Catalogue (1) as Dexia abdominalis. 
= Determined by C. W. Johnson. J. M. Aldrich informs us that this wide-spread 
species is known in collections under the name cremides, but that it does not agree 
with Walker’s description of that species and is probably undescribed. 
