39 PARASITOLOGY. 
with'tar. Itis advocated to make troughs with holes 
bored in sides large enough for a sheep to lick salt 
from. ‘Tar, smeared around these holes, is lodged 
on the nose in the sheep’s efforts to get the salt. 
(Hypo—under) 
HYPoDERMA LINEATA (derma—skin) 
(linea—line). 
Synonyms.—Oestrus lineata. Ox gad-fly; warble- 
fly; grub-fly; striped hypoderma; heel-fly. 
History.—A species found in America; most com- 
mon in southern states. 
Description.—About the size of a honey-bee. Its 
body is black, covered with fine hair. The thorax is 
ornamented with longitudinal gray bands. The fe- 
male is provided with a cone-shape1 ovipositor, with 
which she deposits her eggs, cementing them to the 
hair. 
Life Cycle.—The fly deposits its eggs upon the 
hair in the vicinity of the 
heel. From this point the fmm 
larvae are taken into the ¢ gph 
mouth and become lodged Agra 
in the mucous membrane fi 
of the oesophagus. The 
eggs are laid in summer ee LINEATA 
and the larvae are found in a, Dorsal View 
their most fully developed > Ventral View. 
stage in the oesophagus about November. At 
this time they are about five-eighths of an inch 
long. They now leave this locality and wander 
through the connective tissue to a position under- 
neath the skin in the region of the back. Here 
