98 
from about the posterior part of the oesophagus. The tail was 
pointed and possessed a small rounded tip furnished with 
minute spines. The anus was open and situated 83:3 p from 
the point of the tail. The pharynx was 43:3 p long; the nerve 
ring 130 » from the anterior end of the body, and the 
anterior portion of the oesophagus 133 p to 140 p long. 
The larvae were embedded in paraffin and sectioned. On 
transverse section the cuticle was found to be traversed by fine 
longitudinal ridges. These numbered from forty to forty- 
Wo, as near as could be determined; started immediately 
behind the head and ended near the tail. 
Experiments were undertaken to determine the power of 
the larvae to leave the proboscis of the fly. Flies were placed 
in an inverted wide-mouthed Florence flask. The mouth of the 
flask was surrounded by gauze, which also surrounded the 
mouth of a test tube situated several inches below and con- 
taining sugar dissolved in water. This test tube was kept fille 
with the solution, which was examined from time to time for 
the presence of larvae. The flies drank freely of the solution, 
but at no time were any larvae found to have escaped into the 
solution. : 
. In one case two flies kept overnight in a test tube contain- 
ing a small amount of sugar solution were found to be ead 
through the lips of the proboscis. This is probably due is 
rupture of the proboscis during handling rendering it possible 
ihe larvae to escape from their situation in the mu 
portion into the food canal. 
Experiments were made to determine whether larvae are 
capable of P eia filter paper. A short test tube W^? 
scular 
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