Genus Howardina. 215 



Howardina walkeri. Theobald (1901). 



Culex (Stegomyia) walkeri. Theobald. 



Mono. Culicid. I., p. 424 (1901) ; III., p. 287 (1903) ; Mosq. of Jamaica, p. 20 

 (1905), Theobald and Grabham. 



The hind legs in the female, with a broad basal white band 

 to the first, second and third tarsals, ungues equal and simple. 



A fresh series sent by Dr. Grabham from Jamaica show 

 no variations from the one described in Vol. TIL, but the 

 hind legs which were partly missing are seen to be banded 

 as above. 



Life-history. — The mature insect appears in January, April 

 and May, and is evidently uncommon in the island. It comes 

 in the genus Howardina, which belongs to the Culicinae, and not 

 to the Aedinae. It is called in Jamaica the Pine-wood Mosquito. 



The following is Dr. Grabham's account of the various 

 stages : — 



" The larva assumes a nearly vertical position in the water 

 when resting at the surface film. Colour of head and siphon is 

 light brown, of thorax and abdomen very dark grey ; latter have 

 a thick appearance owing to the presence of large tufted hairs. 

 The abdominal segments have a ring of tufted hairs, about eight 

 in number, at the apex and base. One to seven segments have 

 paired lateral simple hairs. 



" Pecten of tube composed of a row (extending nearly whole 

 length of tube) of simple, slightly-curved bristles, about twenty 

 in number. 



" Chitinous ring of the ninth segment not complete ventrally ; 

 a peculiar digitate hair at the postero-inferior border articulated 

 by a ball-and-socket facet, and terminating in eight to ten bristles \ 

 this appears to be an extra swimming paddle. Both upper and 

 lower brushes of hairs few in number ; lower brush arises from 

 a diamond -shaped plate of chitin situated between the extremities 

 of the incomplete chitinous ring. 



" Antennae have the lateral hairs at junction of upper and 

 middle thirds, terminal hairs short. 



u Lower lip of Meinert rather flat, of nineteen to twenty teeth. 

 Lateral combs of eighth segment of seven to eight stout bristles, 

 each springing from a strong base; bristles curved inwards 

 towards the points, 



" Tufted hairs of five to twenty flattened trichae arranged in 

 a rosette. 



