•181- 



Figure 4-5. Long-slender promastigotes of Leishmania mexicana swimming 

 freely in the hind triangle of an infected sand fly, 

 Lutzomyia diabolica (2-day infection; approx. magn. x 1050) 



J+T '■' 



* Jr: ^ 



Figure 4-6. Short-broad promastigotes ("haptomonads") of Leishmania 



mexicana spewing into the dissecting medium at the site of 

 a rupture in the gut wall of a sand fly, Lutzomyia diabolica 

 (3-day infection; approx. magn. 2640). 



