262 



RESEARCH IN PROTOZOOLOGY 



liumilis in Dahomey (Bouet and Roubaud, 191 1), and by Nysius 

 euphorbice in Mauritius (Lafont, 1911a). 



Herpetomonas elmassiani is transmitted by Oncopeltiis fasciatus. 



\J 



Fig. 17. — A, Latex flagellates of the species Herpetomonas elmassiani 

 Migone in the presence of several nuclei of the latex cells of the host. The 

 latex cell nuclei are readily recognized by the large spherical nucleoli, each 

 of which is surrounded by a halo. The flagellates each contain a single 

 nucleus of delicate construction, and a rod-shaped parabasal body. B, Eggs, 

 first, second, third, fourth and fifth instar nymphs and adult of the hemip- 

 terous insect Oncopeltus fasciatus, the insect host of the latex flagellate 

 Herpetomonas elmassiani. C, Diagrammatic representation of water tube used 

 to maintain a constant supply of water for insect colonies. 



the eggs, nymphs and adults of which are shown in Fig. 17 B 

 and by other species of the same genus. The insect host of 

 Herpetomonas lygceormn is probably Lygccus kalmii, since the 

 species has been collected in this insect (Noguchi, 1926). 



