42 MEDICAL ENTOMOLOGY 



D. Examine a specimen of Tsetse fly, the carrier of A and C. 



a. Examine the moulhparts. 



b. Examine the antenna with plumose arista. 



c. Note general form of the fly, constricted " waist." 

 Draw the specimen in outline. 



E. As a matter of comparison, in a suitable preparation from 

 a fowl suffering with Spirochaetosis, study and draw the causa- 

 tive organism, Spirochceta gallinarum, and compare this further 

 with Treponema pallida of Syphillis. 



EXERCISE 24 



THE MALARIA PARASITES 

 PHYLUM PROTOZOA, CLASS SPOROZOA, ORDER KffiMOSPORIDIA 



NOTE: It is expected that the student will read some concise 

 account of the normal constituents of the blood before proceed- 

 ing with this exercise, e. g. at least the first 9 pages of Chapter I, 

 " Practical Study of Malaria," by Stephens and Christophers. 



A. Sporozoan of quartan malaria, Plasmodium malaria. 



For this exercise use stained blood films from malarial patients. 



Examine slides from cases of quartan infection (malaria with 

 fever recurring every three days, 72 hours). Look for pig- 

 mented bodies inside of red corpuscles. Determine the follow- 

 ing stages: 



a. Small round pigmented body shortly after having entered 

 the corpuscle. 



b. Signet rings, young intracorpuscular parasites. 



c. The parasite nearly filling the corpuscle, showing as a 

 deeply pigmented body consisting of coarse granules. A num- 

 ber of darker bodies may be seen in the parasite, indicating the 

 presence of the micleoli preparatory to sporulation. 



d. Find a corpuscle showing the parasite in a segmented con- 



