Page:Tropical Diseases.djvu/962

904 ventris lays its eggs on damp leaves in damp places, the haunts of a certain species of mosquito, Janthinosoma lutzi (Fig. 217). The packets of eggs are enclosed in a cement which on becoming softened by moisture adheres to the mosquito's thorax, and the eggs are thus conveyed to man or other vertebrate when the mosquito next proceeds to feed.



It is supposed that when hatched out the larvæ penetrate the skin and produce an inflamed swelling about the aperture of entrance, from which a seropurulent fluid, containing the black fæces of the larva, exudes. Depied says that he has twice encountered this larva in the scalp of Tonquinese.



Synonym.—Ochromyia anthropophaga.

Cordylobia anthropophaga (Fig. 218) measures from 8·5 to 11·5 mm. in length. It is of a yellowish-grey colour, with black spots on the abdomen. It was first reported from Cayor, Senegambia, but it is probably widely distributed in tropical Africa. The larva (Fig. 219) burrows into the skin of man