ar Ve 
wi dried out and very hard. In areas where heavy depositions of eggs occur 
the percentage of sterility is much less than in areas where eggs are 
scarce. In the Wagon Mound, N. Mex., area, where collections for arti-—- 
ficial rearings of parasites were made in the fall of 1932, about 50 per-— 
cent sterility occurs. This is also true of the area north of Mills, 
N. Mex., where an abundance of eggs may be found. But in areas where 
eggs are only fairly abundant or scarce from 90 to 100 percent of the eggs 
collected are sterile." 
Notes on a little-known parasite of the Hessian fly.--C. C. Hill, 
Carlisle, Pa., reports on Pleurotropis epigonus Wlk., a parasite intro- 
duced from England in 1891 through the efforts of C. V. Riley and F. 
M. Webster and of Frederick Enock of London, and now found as far south 
as Wythe County, Va., and as far west as Illinois. Mr. Hill says: "Numer- 
ous females of P. epigonus were induced to oviposit repeatedly into 
Hessian fly larvae. They were only interested in mature or almost mature 
larvae in their normal position under the leaf sheaths of growing wheat 
plants. They were uninterested either in’ Hessian fly eggs or young 
larvae exposed to view by the removal of the leaf sheath. The parasite 
is internal, the egg being placed in the body cavity of the host. * * * 
Former attempts to breed this parasite artificially have always failed." 
corn borer.—-J. R. Horton, Wichita, Kans., gives the results of various 
cultural treatments of corn stubble for the control of hibernating lar- 
vae of Diatraea grandiosella Dyar at Tucumcari, N. Mex. He found that 
"Listing (or plowing up the stubs by using a lister or ‘middle buster') 
Pave a gross mortality of 92.3 percent. This was only slightly less 
than the kill obtained by digging up the stubs by hand and afterward 
freeing them from soil, which gave 93.7 percent. Plats on which stalks 
were simply plowed under on October 24 gave only 51 percent gross mor- 
tality. The check plat showed 35 percent mortality, which was unusually 
high and believed to be owing principally to drought. 

COTTON INSECTS 
More on the cotton flea hopper at Port Lavaca, Tex..—-During May 
K. P. Ewing and R. L, McGarr continued their observations on hatch- 
ings of Psallus seriatus Reut., from overwintering eggs, abundance on 
wild host plants, and migration studies. From the 32 hibernation 
cages 4,430 nymphs emerged in May, as compared to 37,221 for April, 
38,578 for March, and 218 for February. From May 17 to May 29 no hatch- 
ing occurred, then after several days of rain (6.4 inches' total) 2,467 
‘nymphs emerged on May 30 and 3l. Ten of the common weeds and cotton 
were caged last fall, but 96.9 of the nymphs have hatched from Croton 
sp. The population on horsemint rapidly increased from 1,161 on April 
21 to 5,824 per 100 sweeps on May 16 to 20, when these plants were in 
full bloom. Then horsemint began to die down and the population de- 
creased to 2,991 hoppers per 100 sweeps by June 1. By the time the 

