218 Arthropods as Essential Hosts of Pathogenic Protozoa 



Glossina palpalis lives in limited areas, where the forest and under- 

 growth is dense, along the lake shore or river banks. According to 

 Hodges, the natural range from shore is under thirty yards, though 

 the distance to which the flies may follow man greatly exceed this. 



It is a day feeder, a fact which may be taken advantage of in 

 avoiding exposure to its attacks. The young are brought forth alive 

 and full-grown, one every nine or ten days. Without feeding, they 

 enter the ground and under favorable conditions, complete their 

 development in a month or more. 





137. 



Sleeping sickness concentration camp in German East Africa. Report of German 

 Commission. 



Methods of control of the disease must look to the prevention 

 of infection of the flies, and to their avoidance and destruction. 

 Along the first line, much was hoped from temporary segregation 

 of the sick in regions where the fly was not found. On the assump- 

 tion that the flies acted as carriers only during the first two or three 

 days, it was supposed that even the "fly belts" would become safe 

 within a few days after the sick were removed. The problem was 

 found to be a much more difficult one when it was learned that after 

 a given brief period the fly again became infective and remained so 

 for an indeterminate period. Nevertheless, isolation of the sick 

 is one of the most important measures in preventing the spread of 



