iGe 
in which adult flies were confined. On the whole, the flies lived 
longer in tightly corked vials than in those through which air was cir- 
culated. This series of experiments is still being carried on, with 
both larvae and adult flies." Mr. Davis also states that "counts (of 
these flies) have been made at Arlington Farm, Va., by spreading sheets 
of tanglefoot paper on the beds. So far these have shown the proportion 
of sexes to be 56.40 per cent males and 43.50 per cent females." 
Mortality of Mexican bean heetle.—-Neale F. Howard and H. C. Ma- 
son, Columbus, Ohio, report that "samples were taken three times dur-— 
ing the month (March) from one of the hibernation cages to determine 
the percentage of survival of the Mexican bean beetle (Epilachna cor— 
rupta Muls.)" Results (tabulated) show that the percentage of live 
beetles ranged from 12.31 to 22.72. The maximum air temperature in 
the cages was 67.5° F. and the minimum 0° F. "From these data it would 
appear that the severe ccld weather of early March did not cause any 
unusual mortality in hibernating adults of the Mexican bean beetle, 
although the data on hand are hardly sufficient to draw a definite 
conclusion." 
Precipitation stimulates emergence of heetles.--J. R. Douglass, 
Estancia, N. Mex., has completed his study on precipitation as a fac— 
tor in the emergence of Epilachna corrupta Muls. from hibernation. 
He summarizes this work as follows:" * * * precipitation is the grea-— 
ter of the two known factors in stimulating emergence of the Mexican 
bean beetle from hibernation; * * * permanent emergence rarely occurs 
when the daily temperature is below 50° F.; * * * rainfall is the starter 
and temperature is the accelarator in stimulating beetles to emerge; * * * 
the temperature during rainfall and subsequent theretois important; increas— 
ing temperature accelarates and decreasing temperature retards emergence; 
appearance in the field is closely associated with emergence from the 
hibernation cages, and emergence can be correlated with rainfall; the peak 
of the overwintered-beetle infestation in the field is subsequent to the 
peak of emergence from the hibernation cages." 

Weights of wireworm larvae.--Continuing his studies on the weights 
of growing larvae, C. E. Woodworth, Walla Walla, Wasch., has found that 
"in two months time an extreme variability of about 120 times has been 
developed (.2 mg. to 23.8 mg.) in young wireworm larvae, the largest 
individual having developed about 300 times its original size, while the 
smallest one is hardly 3 times. * * * Under identical conditions there 
is @ range of from 1.6 to 8.5 times in the size of the smallest and the 
largest. This would indicate that there would be very grave doubt in es— 
timating the age of an individual by size. * * * It also seems that 
eae 
.o° F. again is indicated as the optimum temperature for development 
Ss there are the smallest variations from the mean experienced under both 
of the conditions examined." 
