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half of the legs." This species increased to 25 per animal the middle 
of February and in March from 25 to 50 per animal. The steers at the 
farm have "been considerably annoyed "by stableflies during the last 
month. Often it was difficult to drive them from the tall gallberry 
hushes among which they stood for the slight protection against the 
flies. 
Mississippi. E. W. Dunnam (March 15): The stablefly has "been "breeding 
off and on all the winter. 
CATTLE GRUBS ( Hypo derma spp. ) 
Georgia. A. L. Brody (March 25): Larvae of the cattle grub ( Hypoderma 
probably lineata DeVill. ) were still appearing in the backs of steers 
during the latter part of February. The last recorded removal was 
made on February 2k. The greatest appearance of warbles has been 
noted from the second week in November 1937 to the second week in 
January 193^. 
Iowa. R. W. Wells (March 29): Cattle grubs (H. l ineatum and H. bo vi s 
Deg. ) are more abundant this year than during the preceding 3 years, 
as judged by examinations made of cattle in the counties of Story, 
Boone, Warren, and Clayton. In Warren County all of the 30 larvae 
of H. lineatum taken from 3 head of cattle were in the third or 
final instar. Apparently no grubs had dropped from these cattle on 
March 22, when the examinations were made. In Clayton County on 
March 23, 291 grubs were taken from cattle and 52 percent of them 
were in the second instar. The presence of a few grubs in the first 
instar indicated that not all of the larvae had reached the bncks. 
Missouri. L. Haseman (March 2k): Recent investigations on ox warble con- 
trol have revealed the fact thnt throughout central .and north-central 
Missouri generally our common warble has been maturing ahead of 
schedule. Practically all of the warbles, where the animals were 
not treated, have already escaped from the. backs of cattle. A few 
specimens, not over half-grown, taken during the past weak, seem to 
be individuals of the northern later maturing species. 
HORN ELY ( Haematobia irritans L. ) 
Georgia. A. L. Brody (March 25): Horn flies were first observed to be 
active on February 8, at which time le^s than 10 flies per aninal 
were noted. The number per animal increased to 50 flies during the 
middle of February, and to 15c by the middle of March. It was in- 
teresting to note that on all occasions when observations were made 
more flies were seen on dark- than on light-colored animals. 
