132 Leptomonas Kent 
trypanosome discovered by Woodcock. In addition both Porter and 
Patton have described the life cycles of species of Crithidia which do 
not possess any trypanosome stage and yet occur in blood-sucking 
insects. 
Unfortunately, however, it is quite impossible at the present time 
to decide what form Blitschli had before him, when he described the 
flagellate from the gut of Trilohus gracilis, and which Kent made the 
type of his new genus Leptomonas. Should this parasite L. hiitscldii, 
possess a crithidial stage in its life cycle, the genus Crithidia would 
have to be included as a synonym of Leptomonas and it would be 
necessary to invent a new name for the so-called Leptomonas forms 
described by Chatton and his co-workers, Mackinnon etc. At pi’esent, 
therefore, it is not possible to accept any final system of nomenclature, 
but we must wait until the life history and structure of the type species 
L. hutschlii have been worked out. Only then will it be possible to 
arrive at any definite conclusion on this vexed question of nomencla¬ 
ture. 
LITERATURE. 
Alexieff, a. (1911). Sur le genre Herpetomonas Kent. Compt. rend. Soc. Biol. 
LX.xi. 455-457. 
- (1912). Notes sur les Herpetomonadidae ( = Trypanosomidae Doflein). Arch. 
Zool. exper. Series 5, ix. Notes et Revue, xxix-xxxviii. 
Burnett, W. J. (1851). On organic relations of some of the Infusoria including 
investigations concerning the structure and nature of the genus Bodo. Proc. 
Bost. Soc. Nat. Hist. iv. (1851-54), 124-5. 
BiiTSCHLi, 0. (1878). Beitrage zur Kenntniss der Flagellaten und verw. Orgauismen. 
Zeitschr. f. wiss. Zool. xxx. 205-281. 
-- (1884). Protozoa (in Bronn’s Klass. und Ordn. des Thierreichs, Mastigophora). 
Chatton, E. (1909). Sur un Trypanosomidae nouveau d’une Nycteribie, et sur 
les relations des formes Trypanosoma, Herpetomonas, LeptomoTUts et Crithidia. 
Compt. rend. Soc. Biol. Lxvii. 42-4. 
- (1911). Sur la systematique des Trypanosomides des Insectes. Loc. cit. lxxi. 
578-580. 
—— and Alilaire, E. (1908). Co-existence d’un Leptomonas {Herpetomonas) et 
d’un Trypanosoma chez un muscide non vulnerant. Drosophila confusa Staeger. 
Compt. rend. Soc. Biol. LXiv. 1004-6. 
-and L^ger, A. (1911). Eutrypanosomes, Leptomonas et leptotrypanosomes chez 
Drosophila confusa Staeger (Muscidae). Compt. rend. Soc. Biol. lxx. 34-6. 
-(1911). Sur quelques Leptomonas de Muscides et leurs leptoti-ypanosomes. 
Loc. cit. pp. 120-2. 
- and L^ger, M. (1911). Sur I’axostyle des Trypanosomides des Insectes. 
Loc. cit. LXXI. 575-578. 
