Gs 
A report by R. W. Wells from the Galesburg, Ill., field laboratory 
states that screw-worm flies were first found there this season on June 12. 
By the end of the month they were very common. 
Gastrophilus nasalis L. and G. intestinalis DeG. began ovipositing 
in the region of Galesburg, Ill., about the middle of June. G. nasalis 
were found in abundance on June 21, 50 eggs being taken from one horse 
on that date. Adults of G. haemorrhoidalis L. were active on June 21 and 
very annoying on one farm by June 23. Little has been known as to how 
larvae of G. nasalis gain entrance to the host. It has been found that 
the eggs hatch at room temperatures without moisture or friction. Larvae 
so hatching were placed on the hair of the horse. They crawled actively, 
but none attempted to penetrate. 
On June 8 R. W. Wells secured the stomach of a western horse 
which contained 62 well developed larvae of G. intestinalis. A few of 
these larvae were dissected and in the digestive tracts were found vary- 
ing quantities of the red blood of the horse. The lesions of the horse's 
stomach indicated that the blood of the horse is available to the lar- 
vae, if not a necessary part of their food. 
On June 18 G. H. Bradley, of the mosquito research project, Or-- 
lando, Fla., made a trip to Osceola, on the St. Johns River, where mala-— 
ria was reported to be serious last year. Anopheles mosquitoes were 
T. E. McNeel, of the Orlando laboratory, reports that in several 
large lakes examined by him the percentage of large Mansonia mosquito 
larvae is decreasing. The adult population is also decreasing, as in- 
dicated by trap and hand collecting. 
STORED-PRODUCT INSECTS 
W. D. Reed, of the tobacco insect laboratory, Richmand, Va., re- 
ports that the spring brood of tobacco beetles began to emerge in the 
Richmond and Norfolk districts during the first week of June. Many ex- 
periments in fumigation for the tobacco beetles are now being conducted, 
observations having been made in more than 5,000,000 cubic feet of to- 
bacco storage space during the month. 
An interesting infestation of red spiders (Tetranychus telarius 
L.) in one of the public libraries in Washington was investigated by 
Dr. R. T. Cotton and was found to have originated in heavily infested 
foliage of trees and shrubbery growing near the building. The trees had 
recently been sprayed with an arsenical spray which had caused consider— 
able burning of the foliage. The drying up of the foliage may have caused 
the red spiders to migrate into the near-by building. Several similar 
-infestations have been reported during the summar. 
A. O. Larson, from the field laboratory at Corvallis, Oreg., re- 
ports that there has been a decided reduction in the number of pea weev- 
ils in the field peas that have been dusted by airplane. 
