Genus Corethra. 339 
apical one spreading on to the first long vein, the basal one 
rather indistinct, the median one spreads across the wing field as 
a faint dusky band ; the third long vein is faintly darker than 
the rest; wing fringe long and dense; first sub-marginal cell 
considerably longer and narrower than. the second posterior cell, 
its base very slightly nearer the base of the wing than that of 
the second posterior cell ; its stem about one-third the length of 
the cell, not quite so long as the stem of the second posterior 
cell ; stem of the latter more than half the length of the cell ; 
second long vein carried along past the marginal cross-vein ; 
supernumerary cross-vein sloping towards the apex of the wing ; 
posterior and mid cross-veins in one line ; halteres pale. 
Length.—2°5 mm. 
Habitat.—Gambia (Dr. Dutton). 
Time of capture.—December. 
Observations.—Described from a single @ taken by Dr. 
Dutton at the side of a tub on McCarthy’s Island. It is the 
only African Corethra known, and can easily be told by the 
wing ornamentation and leg banding. The specimen is described 
partly from a xylol-balsam preparation, partly from the dry 
insect. The mouth is provided with very distinct piercing 
lancets. It comes most near Corethra Brasiliensis, but can at 
once be separated by the leg banding, wing venation and 
spotting. The great extension of the second long vein past the 
marginal transverse vein is a very marked character. 
CoRETHRA CORNFORDII. n. sp. 
Head light ochraceous ; thorax ochraceous, with two rather 
darker broad median lines in front and darker behind ; abdomen 
ochraceous ; legs and wings ochraceous. 
@. Head ochraceous, darker at the sides; eyes black; 
hairy, median hairs ochraceous, lateral hairs dark brown ; pro- 
boscis and palpi brown ; antennae banded grey and ochraceous, 
with ochraceous hairs. 
Thorax ochraceous, with two broad darker median lines in 
front separated by a narrow pale line and darker behind, the 
dark colour being almost of a pale chestnut-brown hue ; pro- 
thoracic lobes dark brown, with brown hairs ; the mesothoracic 
hairs ochraceous, long, on the posterior border of the mesonotum 
are two characteristic black spots, one on each outer angle ; 
scutellum ochraceous, with long pale border-bristles ; metanotum 
ochraceous. 
The Oy 
