(139) 



380 C. GOEDON HEWITT. 



noil-flagellate end of the body. No conjugating forms were 

 found, nor any wandering into the ovaries. 



Lingard and Jennings (1. c.) describe certain flagellates of a 

 flag-shaped or rhomboidal nature, which I am strongly of the 

 opinion are species of Crithidia and not species of Her- 

 petomonas. Closely following Prowazek's account of H. 

 muscse-dornesticse they describe and figure all their forms 

 as having two flagellse in the flagellate stage. If one allows 

 for the rupture of the flagellum from the bodies of the 

 organism in making the film, some of their figures are not 

 unlike those of Crithidia gerridis, parasitic in the alimen- 

 tary tract of an Indian water-bug, Gerris fossarum Fabr., 

 and described by Patton (1908). 



2. Nematoda Habronema muscae (Carter). 



Carter (1861) appears to be the first to have described 

 a parasitic worm in. M. domestic a. He described a bi- 

 sexual nematode infesting this insect in Bombay, and found 

 that : " Every third fly contains from two to twenty or more 

 of these worms, which are chiefly congregated in, and con- 

 fined to, the proboscis, though occasionally found among the 

 soft tissues of the head and posterior part of the abdomen." 

 His description of this nematode, to which he gave the name 

 Filaria muscse, is as follows: "Linear, cylindrical, faintly 

 striated transversely, gradually diminishing towards the 

 head, which is obtuse and furnished with four papillae at a 

 little distance from the mouth, two above and two below ; 

 diminishing also towards the tail, which is short and termi- 

 nated by a dilated round extremity covered with short spines. 

 Mouth in the centre of the anterior extremity. Anal orifice 

 at the root of the tail." He gives the length as being one 

 eleventh of an inch and the breadth as one three hundred and 

 thirteenth of an inch. In his description of his figures of the 

 worm he calls what is evidently the anterior region of the 

 intestine the " liver/' Von Linstow (1875) described a small 

 nematode, which he calls Filaria stomoxeos, from the 



