ENTOMOLOGY

DISEASES " BORNE BY NON-BITING FLIES 117 .ing to Roubaud (1918), who finds that the cysts readily pass through thefly intestines at laboratory temperatures or 15-18° C. (59-65° F.) in ~4hours. It may be carried from infected stools to food but must bedeposited in moist substances, as all cysts dJ,"y rapidly in dry flyfeces.Loschia histolytica (Schaudinn), the cause of AMOEBIC DYSEN­TERY, may be carried in the encysted form by Musca domestica andCalliphora erythrocephela according to Flu (19]6). Roubaud (1918)has carefully investigated and finds that the free amoeba is quicklydigested by the fly, but the cysts may pass readily through the intestineswithin ~4 hours and may be demonstrated up to 40 hours. The cysts dierapidly in dry fly feces, and therefore to live must be placed on moistsubstances, or on food.Mastigophora: Protomonadina: BodonidaeProwazekia sp. is found in Fa'Tllnia canicmaris (Dunkerly 19U).Mastigophora: Polymastigina: PolymastigidaeGiardia inte8tinalis (Lambl) (Lamblia), the cause of LAMBLIANDYSENTERY of rodents and man, may be carried in the encysted formby Musca domestica, according to Roubaud (1918), but must be depositedin the feces on moist substances, or directly on food.Mastigophora: Bintuclcata: LeptomonidaeCrithidia calliphorae Swellengrebel is described as a parasite ofCalliphora erythrocephala' Meigen.Crithidia mU8cae-domcsticae "Verner is described as a parasite ofMusca domestica Linnaeus.1-. ptomonas calliphorae (Swingle) is a parasite of Calliphora erythro­