SIA so 
showed infestation, giving a percentage of 64.72 of all the samples in- 
fested. The degree of infestation (not shown in the table) ranged from 
very light to very heavy, the majority being medium. At the end of the 
examination of the 1930 crop an infestation of 30.23 per cent of all 
Varieties was found." 
From Perez Simmons, Fresno, Calif., we have this interesting com- 
ment on bait trapping of dried—-fruit insects: "In view of the more than 
9,000 beneficial parasites (Microbracon and Nemeritis) destroyed during 
the trapping of about 40,000 injurious moths (of which about 20,000 were 
females) there is some question as to the value of the traps for pur—- 
poses other than census-taking. (The parasites listed are not known 
to affect the larvae or adults’ of Carpophilus spp.)." 
Tom Brindley, Moscow, Idaho, continuing in January his weekly 
studies on the mortality of the pea weevil, reports: "Practically no 
mortality was observed among the weevils remaining in the peas in a ware-— 
house, while a loss of 34 per cent has been found among the weevils free 
in the peas. A large part of this mortality may be due to injuries re- 
ceived by the weevils when they were moved about, rather than to climatic 
factors, The maximum mortality found among weevils hibernating in con- 
iferous trees was 10 per cent, while a maximum of 40 per cent was found 
among weevils hibernating in fence posts. Woodpeckers (downy and hairy) 
have reduced considerably the population of weevils hibernating in fence 
posts. * * * In a survey of the number of weevils hibernating in the 
fence posts about a badly infested field 130 posts have been examined 
and 4,576 weevils found, or an average of 37 weevils per post." : 
TOXICOLOGY AND PHYSIOLOGY OF INSECTS 
M. C. Swingle, Takoma, Md., reports that "Proteins and carbo- 
hydrates seem to be more important than fats in the diet of cockroaches. 
* * * Certain carbohydrates were very good. Other carbohydrates, like 
most of the fats tested, were little better than a diet of water alone. 
** * One might conclude * * * that most of the materials eaten by in- 
sects are of practically no food value to them. Many leaf—feeding in— 
Sects do not digest starch or cellulose, although these materials are 
well represented in their diet. * * * the food habits of any insect is 
probably linked up with a relatively small number of organic compounds." 
He says of cockroaches: "In a humid atmosphere these insects can live 
for about a month without food or water, but if placed in an ordinary 
atmosphere where evaporation can take place, they will not live longer 
than a week or ten days. This shows that simple environmental factors, 
such as humidity, may be even more important than food in rearing in- 
sects for experimental work." 
D. E. Fink, Takoma Park, who reported in December on his study of 
the metabolic activity of hibernating larvae of the codling moth (Car- 
pocapsa pomonella L.) and the strawberry leaf roller (Ancylis comptana 
Froel.), submits a summary of results obtained in January. He says 
