100 
two or three days, provided that desiccation is prevented. 
rvae in an earlier stage of development have at times 
been found in the proboscis along with larvae in the final stage 
of development. : 
ailure to produce an infestation of flies occurred, in 
exactly parallel circumstances as in the case of the experi- 
ments with Habronema muscae. 
All attempts to obtain any development of embryos of 
Habronema megastoma in Stomozys calcitrans failed. 
Larvae of H. megastoma.—Larvae obtained from the 
number of 40 or 42, as near as could be determined. 
Observations on the power of the larvae to leave the 
proboscis of the fly gave the same results as those given in 
the case of H. muscae. 
periments made to determine the power of the larvae 
to penetrate filter paper gave negative results. 
Tur LIFE-HISTORY or Habronema microstoma 
(Schneider, 1866). 
The methods adopted at this, investigation have ier 
been mentioned. The embryos were obtained from the gra‘ 
female. Fermenting lawn clippings were used as à breeding 
Embryos of H. microstoma.—The embryos when taken 
rom i ai . hey 
in a thin shell or membrane. When plac 2d 
and tap water, respectively, they behave in the same way 
those of H. muscae. 
when passed out 
The faeces of a a 
