ETIOLOGY 



it is known to occur among the West Indian Islands near South 

 America — e.g., Trinidad. 



It requires a warm, moist climate, with surface water and forest 

 vegetation. 



^^Jtiology— The cause of the disease is the invasion of the body 

 by means of the larva of Dermatohia hominis (Linnaeus junior, 178 1). 



Fig. 724. — J anthinsoma lutzi Theobald, carrying the Eggs of Dermatohia 

 hominis Linnjeus junior. 



(After Sambon.) 



On the evidence at present available it would seem that the fly 

 seizes the female mosquito of the species J anthinsoma lutzi Theobald 

 and attaches her eggs to the ventral aspect of the abdomen, but it 

 has been suggested that it deposits the eggs upon foliage, and these 

 accidentally reach the mosquito, which appears hardly probable. 



When the mosquito feeds upon man or animals the little larva 

 which has been held in position in the egg by its spines slips out 



