128 
THE SPRING GRAIN-APHIS OR i GREEN BUG. 
neura americana. He also reared it from MacrosipTium viticola and 
Ghaitophorus sp. Pachyneuron sp. appears to be quite generally dis- 
tributed but little or nothing is known of its life history. 
Allotria sp. 
AUotria sp. (fig. 37) is recorded as a secondary parasite. Mr. 
Parks verified this by careful rearings at Wellington, Kans., in 
1909, for he was able to rear it only from parasitized aphidids. The 
junior author and Messrs. Kelly and Urbahns have observed it 
ovipositing in parasitized dead aphidids also. Mr. Parks found in 
his experiments that it developed from egg to adult in about 21 
days, under favor- 
able temperatures. 
We have reared 
it only in conjunc- 
tion with Aphidius. 
Messrs. Kelly and 
Urbahns reared it 
from Aphis gossypii 
and A. brassier at 
Wellington, Kans. ; 
Mr. Parks reared it 
from Toxoptera 
from the same local- 
ity; Messrs. Parks 
and Kelly also 
reared it from Tox- 
optera at Washing- 
ton, D. C. Mr. C. 
N. Ainslie reared it from Apliis avense and Eyalopterus dactylidis from 
the same locality. Mr. Kelly reared it from MacrosipTium viticola 
from Wellington, Kans., and the junior author reared it from Myzus 
persicse at Lafayette, Ind. 
PREDACEOTJS ENEMIES. 
Lady-beetles. 
Probably next in importance to the genus Aphidius come the 
ladybird beetles. These beetles, in both the adult and larval stages, 
feed upon plant-lice. In 1907 they became very abundant, destroy- 
ing countless numbers of Toxoptera and greatly assisted Aphidius in 
subduing the pest. Plate VIII represents the manner in which the 
pupae are found attached to plants in fields badly infested with 
Toxoptera; to the left is a 2-inch section of an old cowpea stem; to 
the right, two short sections of wheat stems. Oftentimes as many 
as 30 or more pupae could be found within the space of a foot of a 
single drill row. Adults deposit eggs upon any convenient object. 
Fig. 37— A llotria sp. , a secondary parasite of the spring grain-aphis. Male , 
with female antenna at upper right. Greatly enlarged. (Original.) 
