NEW SPECIES OF AFRICAN SIMULIIDAE. 461 



O. Len{!^th, 1-7 mm. Head with frons aiid face dark brown, pollinose, covered 

 with pale yellow pubescence ; antennae dark brown, covered with minute 

 pubescence, 1st, 2nd, and part of 3rd segments honey-yellow. Thorax black, with 

 dull greenish tints, covered with light brassy pubescence, silvery towards sides, 

 the usual lyre-shaped vittae prominent ; scutellum covered with very long pale 

 brassy hairs. Pleurae dark brown, lacking patch of soft hairs. Wings hyaline, 

 radius unforked. Abdomen dull brown, first three segments covered with dull golden 

 hairs dorsally, last three segments shining dorsally and covered with sparse yellowish 

 hairs. Legs : front legs with coxae yellow, femora and tibiae yellow, dark brown 

 at apical joints, tarsi brown, almost black ; hind legs with coxae yellow, femora 

 yellow, but dark brown at apex ; tibiae dark brown, pale yellow at apical joint and 

 diagonally across middle ; basal two-thirds of metatarsi yellow, remainder of tarsi 

 brown, almost black, second tarsal joint with excision near base, claws with prominent 

 tooth at base. 



Habitat and locality the same as for male type. Not found biting. Described 

 from a single specimen bred from an isolated pupa. 



This species is closely allied to S. anrcosiniile, Pomeroy, but differs in some of the 

 characters of the male genitaha, the coloration of the female, and in the structure 

 of the pupal filaments. 



Pupa. — Cocoon strong, but somewhat loosely woven, of the wall-pocket type, 

 but without " side openings." Respiratory filaments four-branched (PI. xiv, fig. 2). 

 The first two arise from a main stem, which is narrowed at base. The remaining 

 pair branch from a stem at a short distance from the main base. The angle between 

 the filaments is very wide. The ends of the branches are rounded and the 

 chitinous w-all is rather weak. The surface of the chitin, which is covered with 

 minute nodules, is very different in appearance from that of S. aureosimile. Pupa 

 described from the specimen from which the male type emerged. 



Simulium vorax, sp. nov. 



$. Length, 2-5 mm. Head with frons and face grey, covered with shining yellow- 

 grey pubescence ; antennae dark brown, covered with verj^ short fine grey pubescence, 

 the 1st, 2nd and part of 3rd segments clear brown-orange. Thorax dark lustrous 

 grev, brown-grey at sides, the lyre-shaped vittae very dark, prominent and curved ; 

 the entire surface in fresh specimens covered with thick light greenish-golden 

 pubescence ; scutellum covered with long greenish-golden hairs. Pleurae brown-grey, 

 pollinose in some hghts, lacking patch of soft hairs. Wings hyaline, radius unforked. 

 Abdomen dull velvet-black, thickly covered with shining yellow-grey pubescence 

 arranged in whorls, the last three segments less dull, and the 8th and 9th segments 

 with long pale yellow-grey hairs interspersed among the pubescence. Legs : front 

 legs, dark brown, the coxae and basal half of the femora and basal two-thirds of 

 tibiae covered with shining yellow-grey hair, tarsi dark brown, almost black ; hind 

 legs dark brown, basal half of femora and basal two-thirds of tibiae covered with 

 shining yellow-grev hair, tarsi rich dark brown, almost black, basal half of metatarsus, 

 with exception of inner margin, covered with shining yellow-grey hair, second tarsal 

 joint with excision near base, claws simple, with no tooth. 



Habitat. — Taken biting voraciously and engorging on donkey near stream. 



Described from 35 specimens taken at same time and place ; (J unknown. 



Tanganyika Territory : x\mani, 14.xii.l917. 



Type in the British Museum. 



This species is very near to S. neavei, Roub., but differs especially in size, and 

 in the shape and colour of the thorax, which is uniformally dull black in the latter 

 species. 



(5296) 2 L 2 



