PROTOMONADINA 



281 



C. gerridis Patton (Fig. 126 d). In intestine of water bugs, Gerris 

 and Micro velia; 22-45m long. 



C. hyalommae O'Farrell (Fig. 126, e, /). In body cavity of the 

 cattle tick, Hyalomma aegyptium 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. 



Genus Leptomonas Kent. Exclusively parasitic in invertebrates; 

 blepharoplast very close to flagellate end; without undulating mem- 

 brane (Fig, 119) ; non-flagellate phase resembles Leishmania. 



L. ctenocephali Fantham (Fig. 126, g, h). In hindgut of the dog 

 flea, C tenocephalus canis; widely distributed. 



Fig. 126. a-c, Crithidia euryophthalmi (a, b, in mid-gut; c, in rectum), 

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

 rnae, XlOOO (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 L^ger). 



Genus Phytomonas Donovan. Morphologicall}^ similar to Lep- 

 tomonas (Fig. 119); in the latex of plants belonging to the families 

 Euphorbiaceae, Asclepiadaceae, Apoc3^naceae, Sapotaceae and 

 Utricaceae; transmitted by hemipterous insects; often found in 

 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 1.5ai; posterior portion of 

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

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



