354 



PROTOZOOLOGY 



enormous numbers in localized areas in host plant; infection spreads 

 from part to part; infected latex is a clear fluid, owing to the absence 

 of starch grains and other particles, and this results in degeneration 

 of the infected part of the plant. Several species. 



P. davidi (Lafront). 15-20> by about 1.5/z; posterior portion of 

 body often twisted two or three times; multiplication by longitu- 

 dinal fission; widely distributed; in various species of Euphorbia. 



P. elmassiani (Migone) (Fig. 147, i, j). In various species of milk 



Fig. 147. a-c, Crithidia euryophthalmi (a, b, in mid-gut; c, in rectum), 

 X880 (McCulloch); d, C. gerridis, X1070 (Becker); e, f, C. hyalom- 

 mae, X1000 (O'Farrell); g, h, Leptomonas ctenocephali, XlOOO (Wenyon); 

 i, j, Phytomonas elmassiani (i, in milkweed, Asclepias sp. ; j, in gut of a 

 suspected transmitter, Oncopeltus fasciatus), X1500 (Holmes); k, 

 Herpetomonas muscarum, X1070 (Becker); 1-n, H. drosophilae, XlOOO 

 (Chatton and Leger). 



weeds; 9-20/x long; suspected transmitter, Oncopeltus fasciatus 

 (Holmes, 1924); in South and North America. 



Genus Herpetomonas Kent. Ill-defined genus (Fig. 141); ex- 

 clusively invertebrate parasites; Trypanosoma-, Crithidia-, Lep- 

 tomonas-, and Leishmania-forms occur during development. Several 

 species. Species in insects (Drbohlav, 1925). 



H. muscarum (Leidy) (H. muscae-domeslicae Burnett) (Fig. 147, k). 

 In the digestive tube of flies belonging to the genera: Musca, Cal- 

 liphora, Cochliomyia, Sarcophaga, Lucilia, Phormia, etc.; up to 30ju 

 by 2-3/x. Effect on experimental animals (Glaser, 1922) ; comparative 

 study (Becker, 1923a). 



H. drosophilae (Chatton and Alilaire) (Fig. 147, l-n). In intestine 

 of Drosophila confusa; large leptomonad forms 21-25/u long, flagel- 

 lum body-length; forms attached to rectum 4-5m long. 



