THE CATTLE GRUBS CR OX WARBLES Gig veal 
Jarvee by the saddle. The writers have no authentic records of the 
complete development of larve within a horse, but this probably 
occurs occasionally. 
Brauer (8) has described a Hypoderma iarva from the horse and 
was uncertain of its identity. Ormerod (7/) gives considerable in- 
formation on the occurrence of Hypoderma larve in horses in Eng- 
land, but none were positively identified. It is very probable that 
H. bovis or H. lineatum was concerned in these cases. 
The writers have made but a single test of the development of 
Hypoderma larve in a horse. On March 15, 1922, and the following 
day two flies (/7. lineatum) caught in nature were permitted to 
oviposit on the hairs, on the feet, and at the base of the tail of a 
horse. Five days later most of the eggs had hatched and the larvee 
had penetrated the skin as indicated by a copious exudation of 
serum, some of which was slightly tinged with blood. There was 
also some swelling in the region where the larve penetrated at the 
base of the tail. However, the animal did not show any indication 
_of irritation at the time the penetration took place. In about a 
_week the heavy scab formed by the dry serum loosened. Frequent — 
examination of the host during the next year failed to reveal the 
_ presence of a single larva. 
Since it appears that Hypoderma larve may occasionally develop 
in the goat (Capra sp.), several tests were made of this possibility 
with Angora goats. In 1921, 25 eggs were placed by a fly upon a 
_goat’s heels. Three days later some of these were observed to be 
hatched and the larve penetrating, but the animal showed no special 
‘uneasiness. During the following spring about 86 eggs of H. 
lineatum were. placed on the legs of another goat. Some of these 
_were ready to hatch when the hairs bearing them were cemented 
on the animal. Other eggs of this lot were shown to be viable 
_ by incubator tests, but no lesions could be found on the host. Unfor- 
| tunately one of these.goats was lost the following summer, but the 
other failed to develop any larve. On April 10, 1923, a fly was 
| induced to deposit 61 eggs on the legs of a kid. Although the eggs 
| trom this fly were fertile, the host showed no uneasiness and exhibited 
‘no lesions of penetration. Apparently the eggs were lost before 
hatching. No special difficulty was experienced in getting the flies 
to lay eggs on this host. | 
| On December 22, 1920, 30 larvee, 10 to 15 millimeters in length, 
| taken from the gullets of cattle, were inserted under the skin between 
the knee and the hip of an Angora goat. A few days later a careful 
examination of the skin showed the presence of small objects a few 
inches from the point of insertion, which were thought to be some 
| of the larve. On January 17, 1921, two of the larve reached the 
| back in the lumbar region and perforated the skin. These soon 
| scabbed over, however, and on March 4 the lumps were considerably 
reduced in size, and the larve were found to be dead. 
Two Angora goats were infested on November 29, 1922, by means 
| of an incision on the lower part of the thigh. One of these received 
) 18 and the other 20 larvee of H. Lineatum, averaging 13.2 millimeters 
im length, from the gullets of cattle. On the former of these two 
} goats 3 larve appeared under the skin of the back in the lumbar 
| region, 2 on December 12, and 1 on December 19; and on the latter 
