250 



PKOTOZOOLOGY 



intestine with faecal matter and becomes the source of infection 

 in other host animals. 



C. gerridis Patton (Fig. 116, d). In intestine of water bugs, Ger- 

 ris and Micro veha; 22-45)U long. 



C. hyalommae O'Farrell (Fig. 116, e, /). In body cavity of the 

 cattle tick, Hyalomma aegyptmm in Egypt; the flagellate through 

 its invasion of ova is said to be capable of infecting the offspring 

 while it is still in the body of the parent tick. 



C. euryophthalmi McCulloch (Fig. 116, a-c). In gut of Eury- 

 ophthalmus convivus; California coast. 



Fig. 116. a-c, Crithidia euryophthalmi (a, b, in mid-gut; c, in rec- 

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

 hyalommae, XlOOO (O'Farrell); g, h, Leptomonas denocephali, 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 L^ger). 



Genus Leptomonas Kent. Exclusively parasitic in inverte- 

 brates; blepharoplast very close to flagellate end; without un- 

 dulating membrane (Fig. 112); non-flagellate phase resembles 

 Leishmania. 



L. ctenocephali Fantham (Fig. 116, g, h). In hindgut of the dog 

 flea, Ctenocephalus cants; widely distributed. 



Genus Phytomonas Donovan. Morphologically similar to Lep- 

 tomonas (Fig. 112); in the latex of plants belonging to the fami- 

 Hes: Euphorbiaceae, Asclepiadaceae, Apocynaceae, Sapotaceae 

 and Utricaceae; transmitted by hemipterous insects; often found 

 in enormous numbers in localized areas in host plant; infection 



