y=) he 
wintering, larvae. During this month 200 moths emerged, or approximately 
1.2 percent of the total number of larvae hibernating under different 
field conditions, as compared with 23 moths, or approximately 0.12 per— 
cent, of the total number of larvae installed for a similar test the 
year before. This heavy June emergence is quite significant in view of 
the fact that in June the cotton plants in the Presidio district were 
fruiting. The total survival as of June 30 for this experiment was 9.353 
percent, as compared with 3.52 percent for the same test last year. This 
unusually heavy survival was predicted from the winter and early spring 
examination of infested cotton bolls for similar treatments." 
INSECTS AFFECTING MAN AND ANIMALS 
Correction.--In the June 1933 Monthly Letter, p. 8, lines 14 
and 15 should read: Mosquito eggs in moss and rotten wood are submerged 
only at river's flood stage. 
--E, W, Laake, Dallas, Tex., reports on tests with sodium sulphide solu- 
tions, ranging from 1 to 5 percent in concentration, used with fresh 
meat for blowfly baits, the purpose of the experiment being to find a 
solution that would increase the attractiveness of the bait and also 
prevent the breeding of flies in the bait. He says, "These solutions in 
concentrations greater than 2 percent are highly alkaline and inhibit bac— 
terial action on the bait for periods of from 10 to 15 days or longer: 
After this period of inactivity, during which the alkalinity reduces 
to a point where the bait will sustain bacterial growth, an active per— 
iod follows, during which the attrahent properties are equal or greater 
and of longer duration than those of the baits containing solutions of 
lower concentrations. The attractiveness of the baits containing the 
higher concentrations of sodium sulphide, when these baits become ac— 
tive, apparently is enhanced considerably for Cochiyomyia macellaria 
Fab., as compared to that of baits containing sodium sulphide in lower 
concentrations. Very few larvae develop in meat baits containing sodium 
Sulphide solutions of 3 percent and greater, whereas in baits containing 
lower concentrations larvae develop freely and consume the meat rapidly." 
Sodium sulphide solutions in blowfly baits increase attractiveness. 
Flight range of two Aedes mosquitoes.—-H. H. Stage, Portland, Oreg., 
reports the recovery at a distance of several hundred feet of an adult 
Aedes vexans Meig. stained on June 19; also on June 30 of one that had 
flown 3 miles. He states further that "On June 21 it was estimated that 
from 5,000,000 to 15,000,000 adults, largely A. aldrichi Dyar and Knab, 
were stained with a 2 percent aqueous solution of eosin as they were 
resting in the grass adjacent to the water from which they had emerged 
the day before. An hour after being stained several hundred captured 
with a net were examined and 37.1 percent gave positive reactions; 24 
hours later 8.5 percent of those caught were found stained; 48 hours 
later only 4.4 percent were stained. A collection made 5 days later gave 
1.7 percent stained. Twenty-four hours after staining one red-stained 

