378 



FAMILY: TRYPANOSOMID.E 



pighian tubes or in the peritropliic space near their openings. The flagellate occiirs 

 in the trypanosome form, which, still maintaining this structure, becomes a smaller 

 trypauosome form. This becomes doubled into a U form in which the two limbs 

 fuse, and the resulting body then encysts. This process is similar to that described 

 above for H. muscarum. Here, again, the cycle is a simple one (monophasic), and 

 as in the first-mentioned flagellate, by simple reduction in size and retraction of 

 the body, the cyst is produced (Fig. 177). This flagellate, showing the trypano- 



FiG. 175. — Akrangement of the Peritrophic Membrane in the Intestine of 

 DrosopMla confusa. (After Chatton and Leger, 1912.) 



m.p, Peritrophic membrane; ces, oesophagus; Lend, flagellates iii the endotrophic position; I. per, 

 flagellates in the peritrophic position . 



some form in its cycle, becomes Herpeiomonas sp. (1). Chatton (1913) notes that 

 the trypanosome forms which occur in the Malpighian tubes are related to the 

 Khynchoidomonas described by Patton. The third and fourth flagellates of this fly 

 are closely related. They are described as L. drosoplillce by Chatton and Alilaire 

 (1908), and Leptomonas sp. by Chatton and Leger, M. (1912rt). The former occurs 

 as an endotrophic infection in the larva and as a peritrophic infection in the adult, 

 while the latter is only found in the adult in the endotrophic space. The first of 

 these, L. droso-philcc, which will be called here //. drosojMlce, occurs in the adult fly in 



