41 
slender, almost filiform, of apparently three segments, of which the 
first is extremely short, the second about half the length of the third 
Immediately below the antennae is a large stout process furnished at 
the end with a long fan-like fringe of hairs, with a much 
smaller, but similar group of hairs arising from the centre of the lower- 
lateral margins of the same process. The hairs forming the large 
fans are provided with an inner lateral fringe of delicate short hairs 
Mandibles furnished at the tip with two stout and slightly ' lined 
spines and long silken hairs. Maxillae each with a long slender sub 
terminal spine which is sometimes completely hidden in the dense tuft 
K. iV. ,1/1. 
f> 
Fig II.—Larva of Simulium ornatuni: — a. anal segment; />. papillae, .7 . sinker r r 
with its coronet of hooks ( x 45) ; b. anal appendages ( x 451. 
of silken hairs. Antennae short, stout, of two segments, the terminal one 
being about one-fifth the length of the first. Labial plate broad and 
angular; the anterior margin emarginate and furnished with nin<- 
strong teeth or spines, the outer teeth bidentate, the median tooth 
slightly the longest; anterior half of the lateral margins strongly 
serrate ; and there is a submarginal row of long stiff bristles. 
Length of fully matured larva 7-50 to 8‘50 mm. 
FAMILY TAB AN ID JE 
Heematopota duttoni, n. sp. (Newstead) 
(PI. iv, fig. 3) 
Face dark brown, clothed with grey pubescence, with two black 
spots. Palpi dull yellowish-brown, sparsely clothed with black 
