54 EXPERIMENTS WITH CERTAIN DIPTERA. 



copulatory vesicles. In all other cases the flies were lightly 

 infected, the worms being located in similar parts of the 

 body. In one fly, which had been bred from cow dung and 

 had been confined in a cage with captured specimens of 

 M. vetustissima and the black Fannia, and had had access 

 to cow and horse dung for larviposition, two worms were 

 found, one being in a conglobate gland and the other free 

 in the body. 



The small black Fannia was found to be infected on 

 four occasions. Inthi'ee captured females a few worms were 

 detected usually in the common oviduct ; in one male fly, 

 bred from cow dung, a single worm was seen free in the 

 abd jmen. 



Description of tvorm. The majority of specimens 

 obtained were in a very early stage of dev^elopment, measur- 

 ing from 126 to 180 /i in length with a breadth of 13 to 14 ju. 

 Those taken from the single infected 31. vetustissima were 

 larger, measuring 235 ju in length by 13 /li in breadth. In 

 the smaller forms only the rudiments of the intestine could 

 be made out, but in the larger forms it appeared as a thin 

 tube. A number of greenish refractive granules were 

 usually present in the posterior half of the body. The tail 

 was sharply pointed. The delicate cuticle was seen to be 

 ornamented with about nineteen distinct transverse rings, 

 fairly regularly arranged (fig. 16). 



The state of immaturity prevented us from determining 

 the affinities of the ]3arasite which is probably an Agamos- 

 pirura. We prefer to use the wider term Agamonema, 

 associating the name of the fly as the specific name of the 

 worm. 



A tiny parasite, Agamonema sp., somcAvhat resembling 

 A. fannice was found in two out of eight specimens of the 

 common Borborid {Sphcerocera sp ) which frequents and 

 breeds in horse dung in Brisbane. Two worms occurred in 

 one and one in the other. 



Herpetomonas ( Leptomonas) spp. 

 Flagellates resembling H. muscce-domesticce Burnett, 

 were found at Eidsvold in the intestine of Musca fergusoni, 

 21. vetustissima and M. terrce-regince, while members of the 



