. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. Other Nematodes Developing in Arthropods 183 The female worm is excessively long and slender, measuring nearly three feet in length and not more than one-fifteenth of an inch in diameter. It is found in the subcutaneous connective tissue and when mature usually nnigrates to some part of the leg. Here it pierces the skin and there is formed a small superficial ulcer through which the larvee reach the exterior after bursting the body of the mother. Fedtschenko (1879) found that when these larvse
. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. Other Nematodes Developing in Arthropods 183 The female worm is excessively long and slender, measuring nearly three feet in length and not more than one-fifteenth of an inch in diameter. It is found in the subcutaneous connective tissue and when mature usually nnigrates to some part of the leg. Here it pierces the skin and there is formed a small superficial ulcer through which the larvee reach the exterior after bursting the body of the mother. Fedtschenko (1879) found that when these larvse reach the water they penetrate the carapace of the little crustacean, Cyclops (fig. 122). Here they molt several times and tmdergo a metamorphosis. Fedts- chenko, in Turkestan, found that these stages required about five weeks, while Manson who confirmed these general results, found that eight or nine weeks were intl™edSe'°host*of required in the cooler climate of Engand. Dracunouius. Infection of the vertebrate host probably occvirs through swallow- ing infested cyclops in drinking water. Fedtschenko was unable to demonstrate this experimentally and objection has been raised against the theory, but Leiper (1907), andStrassen (1907) succeeded in infest- ing monkeys by feeding them on cyclops containing the larvae. Habronema muscce is a worm which has long been known in its larval stage, as a parasite of the house-fly. Carter found them in 33 per cent of the house-flies examined in Bombay during July, i860, and since that time they have been shown to be very widely distrib- uted. Italian workers reported them in 12 per cent to 30 per cent of the fUes examined. Hewitt reported finding it rarely in England. In this country it was first reported by Leidy who foimd it in about 20 per cent of the flies examined at Philadelphia, Pa. Since then it has been reported by several American workers. We have fouind it at Ithaca, N. Y., but have not made sufficient examinations to justify
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