LOASIS 



295 



narrow curved scales, and the wings with long, lateral, slender scales 

 on the veins. 



It is of a brownish colour, with a broad white and pale yellow band 

 across each abdominal segment; the ventral surface is pale. 



The legs are brown except for a small pale " knee " spot at the 

 tip of the femora. 



The larvcB may be found in any water near to iiuman dwellings or 

 in sewage. They have a long, slender breathing tube two and a half 

 times the length and twice the breadth of the slender pointed tracheal 

 gills. 



The antennae carry a fan-like tuft of twenty long hairs. 



Habits. — They breed in water-butts, drains, and any temporary 



Larva of Anopheles iiiaciilipeniiis, Fabr. 

 Enlarged. (After Grassi.) 



Larva of Culex. Enlarged. 

 (After Grassi.) 



collection of water. Thev are the commonest mosquitoes in the 

 Tropics. 



LOASIS. 



DEFINITION. 



An inflammatory condition of the superficial connective tissue or 

 conjunctiva caused by the Loa loa. 



DISTRIBUTION. 



In Africa, chieflv in Angola, Congo, and on the West Coast, where 

 it is endemic. It is very common in Old Calabar and the Cameroons. 

 Perhaps it causes the Calabar swellings. 

 It has been imported to the West Indies. 



