101 
material. Flies hatching out from eighteen to nineteen days 
later contained larvae. 
ies.—The rate of development of the worm larvae 
within the developing larvae and pupae of Stomozys calcitrans 
appears to depend largely upon temperature. Flies bred at 
to 22° 
pi 
b 
ment situated usually in the abdomen. ) 
higher temperature, 25? to 26? C., develop more quickly, from 
For the most part, newly-hatched flies showed larvae in 
These larvae developed into the final stage in from five to 
seven days, and migrated to the head and proboscis. Larvae 
ttempts 
Usually gave negative results, 
an aberrant development of larvae of H. muicrostom 
domestica, In thi of the flies examined showed 
embryos and larvae in varying 
development was distinctly aberrant, the la 
Sia from 
‘one of the embryos developed in 
as seen in the normal development. The longer 
* 
