fig. 
Conclusion: On the basis of an equal chance of being right with- 
in the prescribed limits, it made no practical difference whether 100-~- 
unit samples or only 36-unit samples were examined. The 100-unit sample, 
however, riore narrowly restricted the range within which the probability 
“Ws as. stated that the mean would fall. j 
Platygaster herrickii perthenogenetic,--W. 1. ‘Enery, Wichita, re-— 
ports on the outcome. of two experiments with this species started in 
January 1933 from which 23 males and 7 males, respectively, have now 
emerged, indicating, he says, that the original specimens in this case 
were arrhenotokous. 
Parasite of alfalfa weevil to be liberated at Medford, Orer.—- 
According to George I. Reeves, 2 consecutive years of observations 
ot Medford have shown that the climatic conditions prevalent there 
may reasonably be expected to exert a large cegree-of control over 
Hypera postica Gyll., but not entirely to prevent its ravages, and 
that no interference with natural and cultural control of the pest is 
to be apprehended from the introduction of Bathyplectes curculionis 
Thoms. Several thousand cocoons of this parasite collected at Salt 
Lake’ City, Utah, during the past season were accordingly taken to Med— 
ford late in January by R. C. Newton upon his. return to that place 
-after a month spent in analysis of his field observations and similar 
data relating to other localities in the alfalfa weevil territory. 
A good emergence is expected from these cocoons, whose development _ 
will be deloyed until the larvae of the host are available, and t he: 
adult parasites will then be Liberated in carefully selected fields 
Peo. Pee eeretaa ce Austrian field peas, and Scotch broon.-- 
L. P. Rockvood reports that. "Aphids (Illinoia pisi Kalt.) increased 
slowly on vetch on our plots at Forest. Grove, Oreg., seeded on 
Sept. 19, Oct. 5, and Oct. 18, 1933. A few alates and nymphs were 
taken on these plots. on January 11, but none on January 29. Aphids 
decreasec. fsreatly on volunteer : aaplee cs peas near Barlow, Oreg., 
coincidentally with:extensive damage to the peas by a fungous dis- 
ease. The same has been true, to a lesser degree, on plots of Aus- 
trian peas seeded on Sept. 19 and Oct. 5, 1933, at Forest Grove. 
Plots sown later show but little damage from the fungous Ci sease. 
Plots of pees and vetch seeded on Nov. 6, 1933, showed no aphids on 
= January 29 upon careful examination, The fungous’ disease caused by 
Empusa aphidis was present: among aphids onearly sown vetch and pea 
plots at Forest Grove on January 11 and 29. ae young of I. pisi 
were hatching from eggs on Scotch broom in Clackamas County on Jan- 
vary 30. Examination of eggs on the twigs sted that more than 40 
percent had hatched in one locality on the banks of the Molalla River. 
‘The larvae secn were quite small, probably in the first stage; " 

