-87- 



50% of dissected Uu diabol ica are cilliated protozoans. She based 

 this judgment on their rapid movement and sudden directional change. 

 These parasites do not appear to have any adverse effect on the sand 

 fly and are most likely true commensals. Lewis (1965) found probable 

 ciliates in 10% of Lu. shannoni taken in resting collections in 

 Panama. The decrease in infection rate from June 1982 (60%) to 

 September (27%) remains unexplained. It is possibly due to changes in 

 meteorological conditions or in seasonal changes in the availability 

 of some food source from which the organism is acquired. Further 

 studies on this parasite are needed to identify their interaction with 

 Lu. diabol ica . 



It is possible that the small thin "flagellates" found in two 

 females in the fall of 1983 were merely artifacts. Upon close re- 

 examination of the stained microscope slide mounts, no such objects 

 could be seen. 



The flagellates found in the one female collected at Garner State 

 Park during June of 1982 remain unidentified. A permanent slide mount 

 of rather poor quality was made of these protozoans and is in the 

 author's possession. Chaniotis and Anderson (1968) described similar 

 flagellates, trypanosomes, in _Lu. vexator (Fairchild and Hertig) 

 collected at Capay, Yolo County, California. They reported a 20% 

 infection rate in females and no infection in males. Other authors, 

 too numerous to list here, have reported a variety of leptomonad and 

 herpetomonad flagellates in different sand fly species. 



Gregarines . Gregarine parasites have been reported from 24 sand 

 fly species (Young and Lewis, 1977, 1980). These protozoans, 

 belonging to the subphylum Apicomplexa, subclass Gregarina Oufour, 



