ae 
of sand-fly larvae in ditches traversing open marshes and in those ending 
in open marshes. The records suggest that the reduction in numbers of 
larvae in good ditches was permanent. They show that the blind ditches 
terminating in the open marshes are now receiving increased numbers of 
larvae. Since the storm tides, the normal high tides are returning lar- 
yae from the open marshes to the blind ditches. * * * The studies on 
ditches emptying into running streams at Fort Pierce give good evidence 
on efficacy of properly constructed ditches. On the other hand, the evi- 
dence obtained at Savannah and Charleston gives evidence that ditches 
terminating in the open marshes are not effective in permanently dis- 
patching sand-fly larvae. From the open marshes the larvae return with 
high tides to the blind ditches and depressions. The evidence obtained 
leaves little or no doubt that larvae travel over open marshes and that 
they go with the tides." 
Viability of eggs of horse botfly.--R. W. Wells, Ames, Iowa, re- 
ports that of 2,200 eggs of Gastrophilus intestinalis DeG. collected from 
horses in the vicinity of Columbia, Mo., January 17 and 18, 3.9 percent 
were viable and that of 1,300 eggs collected from horses at Ames January 
2, 4.15 percent were viable. 
Effective dips for goat lice.--0. G. Babcock, Sonora, Tex., reports 
that 100 per cent control of goat lice was obtained when "the entire sta- 
tion flock of goats, 570 head, were dipped October 7 and 17 in the follow- 
ing formula: 
Wettable thylox<flotation> sulphuraes. cee 10 pounds 
BinSeead roll). -Soans se eee ee eee haem ee eo Ounces 
Sodium phosphate tribasic....... CO Ae cen ee eee es .. #2o ounces 
WAVOD Rohn Patt Ac att tem ean be pdiyar tes akceri anata. Be me ceanree 
He states that the entire flock appeared to be free of all lice at 
time of second dipping and that these results corroborate results of 
Similar work in 1930. He states further that "The goats in one pen were 
dipped on April 13, 1932, in thylox wettable sulphur, 2 pounds to 100 
gallons of water plus 25 ounces each of linseed oil soap and sodium phosph— 
ate tribasic. These goats are still 100 percent clean after a period of 
281 days following a single dipping." 
STORED PRODUCT INSECTS 
Survival of dried fruit beetle under water.-—"In order to obtain 
information about the resistance of adults of Carpohilus hemipterus L. 
to submersion by irrigation water or winter rains," Dwight F. Barnes, 
Fresno, Calif., "made tests at outdoor temperatures which were below 
50°F. Survivals of 88 percent after submersion for 24 hours (5 tests), 
of 80 percent after 48 hours (5 tests), and 73 percent after 72 hours 
(5 tests) were recorded. One test showed a survival of 37 percent af— . 
ter 91 hours, but 3 tests of 96 hours' submersion resulted in complete 
mortality." 
