PAKASITE, APHIDIUS TESTACEIPES. 11? 
with these synonyms collectively under A. testaceipes. The hosts 
then would be as follows: Reared from Macrosiphum cucurbitse by 
the senior author at Lafayette, Ind.; reared from an aphidid on 
Eragrostis sp., by Mr. D. W. Coquillett; reared from Macrosiphum 
sp. on Audibertia stochoides, by Mr. Coquillett, at Los Angeles, Cal. 
Swept from Eragrostis sp. by the senior author at La Fayette, Ind., 
October 4, 1885; reared from Myzus sp. on Hosackia glabra by Mr. 
Coquillett at Los Angeles, Cal.; reared from Myzus ribis (currant 
aphis) by Prof. A. J. Cook, Lansing, Mich.; reared from Aphis gos- 
sypii by Prof. G. F. Atkinson, Columbia, S. C; reared from Macro- 
siplium sp. on Abutilon by Mr. Coquillett at Los Angeles, Cal. ; reared 
from Aphis avenx by Mr. J. W. Barlow, June 20, 1882, at Cadet, Mo.; 
reared from Aphis on peach May, 1886, by Mr. Albert Koebele, 
Fresno County, Cal.; reared from an aphidid on Baccharis viminalis 
by Mr. Coquillett at Los Angeles, Cal. 
There are probably many other hosts besides the ones we have 
mentioned of which as yet we have no knowledge; and when this 
situation is taken under consideration it is very easy to see that it 
would be only in rare instances and under peculiar conditions that 
a locality would be found where Aphidius testaceipes would not be 
lurking, waiting for favorable weather conditions and abundant 
supplies of its host aphidids to make its appearance in greater or less 
numbers. 
HIBERNATION. 
Aphidius is capable of withstanding extreme degrees of cold, as 
witnessed by the fact that Toxoptera parasitized during November, 
1907, at Richmond, Ind., did not give up adults until the 27th and 
28th of March and the 4th of April following. During February they 
were in the larval stage within an old dead body of a Toxoptera. 
Mr. Kelly found that at Leavenworth, Kans., the parasites hiber- 
nated as larvae and pupae. This was shown by the fact that he found 
Apliidius testaceipes in the field in this condition on November 13, 
1907. From a lot of 50 dead parasitized Toxoptera from the same 
field, that had been washed or rubbed off the leaves of the young 
grain and were taken out of the mud about the wheat plants on 
February 28, after the winter was practically over, Mr. Kelly found 
that 17 contained full-grown larvae, 12 contained pupae of a light 
color, and 21 contained pupae of a dark color; the latter apparently 
were ready to develop promptly with the advent of warm weather. 
Mr. Kelly collected, on the same date and also from this same field, 
a number of Toxoptera in various stages of development that were 
hibernating in the fields and which showed no signs of parasitism; 
the weather had been such as to preclude the possibility of their 
having recently been parasitized. I^hese were placed in a warm 
room and soon showed evidence of parasitism, Aphidius testaceipes 
being finally reared from them. 
