78 
respectively. Inference of their parasitic habits is based on the remains 
of Phyllophaga grubs found attached to the above-mentioned cocoons 
collected at Lafayette. This species was also reared from cocoons col- 
lected behind the plow at Wellington, Kan., by Mr. H. E. Smith, the 
adult issuing July 5, 1913. The adults are to be found feeding on 
flowers of such roadside plants as the white sweet clover. 
Eis opscura Fabr. 
Although there is no direct evidence of the parasitic activities of 
this or the following species of Elis the fact that their cocoons are to 
be found in fields infested with white-grubs makes it quite likely that 
they will prove to have parasitic habits similar to those of the species 
already discussed. We have reared FE. obscura from a cocoon collected 
by Mr. J. A. Hyslop at Hagerstown, Md., the adult issuing June 29, 
1915; Mr. W. R. McConnell reared it from cocoons collected at Green- 
wood, Miss., the adults issuing May 30-31, 1913; and Mr. Harrison E. 
Smith obtained several adults between June 3 and 1% from cocoons 
collected in plow furrows at the same place. 
ELts ILLINOISENSIS Dalla Torre 
Our records show this species to have been reared from cocoons 
collected behind the plow by Mr. C. N. Ainslie at Elk Point, S. Dak., 
and by Mr. H. E. Smith at Greenwood, Miss., the adults in the latter 
case issuing June 3-17, 1914. The status of this species in relation to 
white-grubs is the same as that of E. obscura. 
TacHINID AND DerxiIp PARASITES 
Five species, two tachinids and three dexiids, have been reared 
from white-grubs of the genus Phyllophaga. Two of these species 
(Microphthalma disjuncta and Ptilodexia harpasa) are of considerable 
value in certain areas, and it appears that their occurrence in beneficial 
numbers depends largely on soil conditions which will enable the young 
larvae to easily penetrate the soil and so come in contact with their hosts. 
Two others of the five species, Microphthalma pruinosa and Ptilodexia 
abdominalis, can not be regarded as important enemies because of their 
rarity; and the remaining species (Myocera cremides?) is more often 
a parasite of Serica and grubs of similar habitat, than of Phyllophaga. 
Another dexiid (Prosena lacertosa v.d.W.), briefly treated in a subse- 
quent paragraph, has been reported as a parasite of white-grubs in 
Mexico. 
MicroPHTHALMA DISJUNCTA Wied. 
This species, under the name M. migra, was first recorded as a para- 
site of white-grubs by Dr. S. A. Forbes (24) in 1891, who subsequently 
reared it from white-grubs (25 and 26), as has also the writer (16). 
Mr. D. W. Coquillett (13) reports it as reared by the late Theo. 
Pergande from a puparium found in the skin of a grub August 12, 
1891, at Washington, D. C., the adult issuing October 15. 
