180 PROTOZOAL PARASITES 



Leptomonas muscae-domesticae. In a paper on some stages in 

 the life-history of what he considers to be a distinct flagellate, 

 Dunkerly (I.e.) attempts to show that CrithicUa is not a valid 

 genus and cannot be applied as a generic name to any form, as it 

 has simply been the name given to two stages of a Leptomonas. 

 He describes a Leptomonad which actively divides in the intestine 

 or in the malpighian tubules of the fly and also very active slender 

 forms which often show an undulating membrane. Encystment 

 while attached to the rectal wall in large numbers probably takes 

 place and the cysts may be passed out with the faeces and thus 

 infect fresh flies. Porter (1911) calls attention to the faulty 

 reasoning contained in Dunkerly's paper, as she considers it, and 

 the lack of evidence. Wenyon (I.e.) believes that the Leptomonas 

 of Roubaud and others is merely a not actively dividing Herpeto- 

 monas muscae-domesticae and that both may pass through a 

 transition into flagellates of a trypanosome type. 



Patton (1909) refers in a critical paper to the discovery which 

 he made of another flagellate in the malpighian tubules of 

 J/, domestica but I am unaAvare of any further reference to it. 



