TRYPANOSOMES OF LAND REPTILES 583 



exanthematicus) as well as crocodiles on which the flies feed. If this be the 

 case, they would represent developmental forms of T. varani, first seen 

 by the writer (1909) in the Sudan. It is possible that under the names 

 T. grmji and H. grayi several reptilian trypanosomes have been grouped, 

 and that it will not be possible to identify the flagellates first named 

 H. grayi with any particular trypanosome. The question of the flagellates 

 of tsetse flies is still further complicated by the recent discovery by Lloyd, 

 Johnson, Young, and Morrison (1924) that crithidia forms indistinguish- 

 able from those of T. grayi appear in the intestine of G. tachinoides after 

 feeding on toads {Bufo regularis), which harbour trypanosomes resembling 

 T. varani (see p. 374). 



The trypanosome (Fig. 236, 3) seen by Bruce et al. (1911/) in the 

 crocodile {Crocodilus niloticus) had a total length of 87 microns, which 

 was made up as follows: posterior end to the kinetoplast, 18 microns; 

 kinetoplast to anterior end, 46 microns; flagellum, 23 microns. The 

 body showed longitudinal myoneme striations. The trypanosome was 

 cultivated by Koch (1906), and by Kleine and Taute (1911). A try- 

 panosome about half the length of the form seen by Bruce was recorded 

 from C. catejpractus by Button, Todd, and Tobey (1907) in the Congo. 



Other Trypanosomes of Land Reptiles. 



Martin (1907) described as T. boneti a broad leaf-like trypanosome 

 from Mahuia raddoni of French Guinea, while Bouet (1909) gave the name 

 T. martini to a similar form found by him in M. maculilahris and M. perro- 

 teti of the Ivory Coast. Fran9a (1911a) named the form from the second 

 of these hosts T. jperroteti. The writer (1909) described as T. mahuicB 

 a trypanosome of M. quinquetcBniata of the Southern Sudan (Fig. 236, 6-7). 

 The trypanosome occurred in two forms — one a broad leaf-like trypano- 

 some resembling T. rotatorium of the frog and measuring 30 to 40 by 

 8 microns, and the other a smaller trypanosome like T. inopinatutn of the 

 frog and measuring 20 to 25 by 2 to 2-5 microns. It is possible that the 

 various species described from the skinks of the genus Mahuia are different 

 stages of one polymorphic trypanosome like T. rotatorium of frogs, in 

 which case Martin's name, T. boueti, will have priority. A broad leaf-like 

 trypanosome was described by the writer (1909) as T. chamceleonis from 

 Chamceleon vulgaris of the Sudan, and another similar form from the 

 monitor {Varanus niloticus) as T. varani. 



Robertson (1908) recorded trypanosomes from two geckos of Ceylon. 

 One which occurred in Hemidactylus leschenaultii w^as named T. lesclie- 

 naultii. It measured 56 to 60 microns in length, and had a flagellum 

 measuring 17 to 20 microns. The other, named T. pertenue, occurred in 



