The larva does not seem to have been described, but Austen describes the pupa (Trans. Soc. Trop. Med. and Hyg., iii, No. 5, p. 229).
Phora rufipes, Meig.
The larvæ of the “hump-backed fly” live in rotting potatoes, mushrooms, radishes, etc., and when accidentally introduced into the intestine of man can, like other larvæ, live there twenty-four hours and even more, and may set up serious gastric disturbances.
P. rufipes is the same as P. pallipes, Latr.
Family. Sepsidæ.
Small blackish flies, elongate, with abdomen narrowed at the base, thickened and curved downwards towards the extremity. Larvæ often found in decaying vegetables, ham, cheese, etc. The larvae have the power of skipping; conical in form, pointed in front, truncated behind, about 5 mm. long, shiny and smooth, the anal segment with fleshy protuberances. The genus Piophila has a short proboscis and the cross-veins of the wings approximate.
Piophila casei, L.
Cheese flies. The larvæ live in ripe cheese, with which they are sometimes introduced into human beings (Meschede).
The larvæ of the cheese flies (Piophila casei) may pass through the alimentary canal of human beings alive, and have been occasionally referred to in cases of internal myiasis. It also breeds in dead bodies in adipose tissue. Howard records it on human excrement. It is thus possible that some of the recorded cases of this pest being passed alive may be due to eggs deposited on human fæces.
Family. Syrphidæ (Hover and Drone Flies).