£911, | Trypanosoma gambiense im Glossina palpalis. 523 
x 2000. 
Fie. 51.—Slender type of Trypanosoma gambiense from proventriculus, 17 days after. 
infected feed. 
Fie. 52.—Slender type of 7. gambiense from mid-gut, 17 days after infected feed. 
Fig. 53.—Slender type of 7. gambiense from hind-gut, 20 days after infected feed. 
Figs. 54 and 55.—Slender types of 7. gambiense from fore-gut, 24 and 30 days after 
infected feed. 
Fias. 56 and 57.—Slender types of 7. gambiense from proventriculus, 44 days after 
infected feed. 
Fies. 58 and 59.—Slender types of 7. gambiense from fore-gut, 46 days after infected 
feed. 
Figs. 51—59 represent various varieties of the slender type of Trypanosoma gambiense 
found in the intestine of Glossina palpalis. Fig. 59 is dividing. Fig. 58 is a Crithidia 
type. These slender and crithidial types are uncommon, and no special connection 
between them and the onset of infectivity in the fly has been made out. 
