Species of West- African Culicida3. 269 



Abdomen covered with dark purple-brown scales; second 

 segment with median basal white patch ; the other segments 

 with white basal bands, except the terminal segment ; border- 

 hairs pale. Venter black, with basal median patches of white 

 scales. Legs dark purple-brown ; femora pale beneath ; 

 apical pale spots upon femora and tibia?. Ungues equal and 

 uniserrate. Wings with dark brown dense scales ; first sub- 

 marginal longer and narrower than second posterior cell ; 

 stem more than ^ the length of the cell ; stem of second 

 posterior equal to the length of the cell ; posterior cross-vein 

 more than its own length from the mid cross-vein. Halteres 

 pale, with pale knobs. 



Length 4 mm. 



S . — Resembles the female. Palpi longer than proboscis 

 by length of terminal segment ; terminal segments of nearly- 

 equal length, the apical one being paler and thinner, with 

 somewhat rounded point ; plume-hairs brown. Scutellum : 

 mid lobe with six bristles, lateral with five. Ungues on fore 

 and mid legs unequal and uniserrate ; on hind legs equal and 

 simple. Wings : first submarginal stem somewhat shorter 

 than cell ; second posterior stem somewhat longer than cell ; 

 posterior cross- vein somewhat more than its own length from 

 the mid cross-vein. 



Length 4 mm. 



Culex lividocostalis, sp. n. 



? . — Head dark brown, covered with white narrow curved, 

 and dark brown upright forked scales, with white lines 

 round the orbits running into lateral patches of flat white 

 scales ; orbital bristles dark brown. Palpi dark brown, with 

 scattered white scales on inner surface. Clgpeus dark brown. 

 Proboscis dark brown, with pale apex, unbanded. Antennce 

 brown, with narrow white bands at whorls ; plume-hairs 

 dark brown. Thorax brown, covered with golden-brown 

 scale. , showing two longitudinal bare lines; scales in front 

 of scutellum somewhat lighter in colour ; bristles dark brown 

 behind, paler in front. Scutellum yellowish green, with pale 

 brown scales; eight dark brown bristles to mid, four to each 

 lateral lobe. Pleura brown, with white-scaled patches. 

 Metanotum dark brown. Abdomen covered with dark brown 

 scales; first segment with a median brown patch, the other 

 segments with basal white bands, becoming narrow in the 

 middle line and expanding laterally as they approach the 

 apex ; on the last segment the lateral spots do not meet to 

 form a band ; basal lateral white spots on all segments ; 



