DISEASES BORNE BY NON-BITING FLIES 117 



ing to Roubaud (1918), who finds that the cysts readily pass through the 

 fly intestines at laboratory temperatures of 15-18° C. (59-65° F.) in M 

 hours. It may be carried from jjifected stools to food but must be 

 deposited in moist substances, as all cysts dry rapidly in dry fly 

 feces. 



Loschia histolytica (Schaudinn), the cause of AMOEBIC DYSEN- 

 TERY, may be carried in the encysted form by Musca domestica and 

 Calliphora erythrocephela according to Flu (1916). Roubaud (1918) 

 has carefully investigated and finds that the free amoeba is quickly 

 digested by the fly, but the cysts may pass readily through the intestines 

 within 24! hours and may be demonstrated up to 40 hours. The cysts die 

 rapidly in dry fly feces, and therefore to live must be placed on moist 

 substances, or on food. 



Mastigophora: Protomonadina: Bodonidae 

 Prowazekia sp. is found in Fannia camcularis (Dunkerly 1912). 



Mastigophora: Polymastigvna: Polymastigidae 



Giardia vntestimalis (Lambl) (Lamblia), the cause of LAMBLIAN 

 DYSENTERY of rodents. and man, may be carried in the encysted form 

 by Musca domestica, according to Roubaud (1918), but must be deposited 

 in the feces on moist substances, or directly on food. 



Mastigophora: Bvrmcleata: Leptomonidae 



Crithidia calliphorae Swellengrebel is described as a parasite of 

 Calliphora erythrocephala Meigen. 



Crithidia muscae-domesticae Werner is described as a parasite of 

 Musca domestica Linnaeus. 



Leptomonas calliphorae (Swingle) is a parasite of Calliphora erythro- 

 cephala Meigen. 



Leptomonas drosophilae Chatton and Alilaire is a parasite of 

 Drosophila confu^a. 



Leptomonas homalomyiae (Brug) is a parasite of Fanma scalaris 

 Fabricius. 



Leptomonas lineata (Swingle) is a parasite of Sarcophaga sarraceniae 



Riley. 



Leptomonas luciliae (Strickland) is a parasite of Lucilia sp. 



Leptomonas luciliae (Roubaud) is described as a parasite of Lucilia 

 serenissima Walker. 



Leptomonas mesnili Roubaud is a parasite of Lucilia sp. 



