viii 
APPENDIX 
XIII. Culex fatigans. Wied. 
This common household Culex occurs in abundance in Bathurst, and was taken in numbers as 
usual indoors. Some were hatched from larvae 'from an old tin,' others 'from a well,' ' from a rain tub,' 
' from water in rice field at Cape St. Mar}',' ' from well in Government House with heaps of green slime.' 
This species seems abundant in the prison at Bathurst, and has been shown by Dr. Dutton to be the 
intermediate host of Filaria nocturna, as well as Culex duttoni. 
They were taken in October, November, December, and January. 
XIV. Culex euclastus. N. sp. 
Head brown with grey scales, most distinct around the eyes. Thorax brown with tawny-brown 
scales. Abdomen brown, unhanded, with basal white lateral spots, which show dorsally on the last few 
segments ; legs brown, unbanded, basally grey. Sixth long vein rather close to the fifth. 
9 - Head dark brown with narrow-curved dull-grey scales, rather wider and paler around the eyes, 
and with dark upright forked-scales ; proboscis and palpi dark brown : antennae dark brown, basal joint paler. 
Thorax brown with very small narrow-curved scales of a fawny-brown to dull brownish-grey hue, and 
with dark-brown bristles ; scutellum paler brown with narrow-curved grey scales ; metanotum brown ; 
pleurae pallid. 
Abdomen brown, unbanded, with basal white lateral spots, which are pronounced, and which 
show dorsally on the last few segments. Venter, brown with dull grey basal bands ; border-bristles and 
hairs brown, except at the apex, where they are pallid ; the denuded surface of the abdomen has a shiny 
and somewhat pale steel colour. 
Legs brown, unbanded, a faint pale knee spot on the hind legs and traces of a pale apical tibial 
spot ; bases of the legs and centre of the femora pallid ; hind metatarsi about the same length as the 
hind tibiae ; legs with a few bristles. Ungues small, equal and simple. Wings with deep-brown scales, 
costa very dark; first submarginal cell longer and narrower than the second posterior cell, its base very 
slightly nearer the base of the wing than th.it of the second posterior cell ; its stem rather less than half 
the length of the cell ; stem of the second posterior rather more than two-thirds the length of the cell ; 
posterior cross-vein longer than the mid, rather more than its own length distant from it ; the sixth 
long vein runs parallel with the fifth at its base, and is rather closer than usual to it. Halteres brown, 
with dense white scales. 
Length — 4. mm. Habitat — -Gambia. Time of capture — October. 
Observations — Described from two perfect 9 ' s bred by Dr. Dutton from larvae taken from pools 
at Box Bar. 
It is a very small fragile-looking species, unlike any other I have seen from Africa, and to some 
extent approaches Culex nigritulus Zett, but is very distinct in regard to thoracic scale structure and vena- 
tion. The type is deposited in tfe British Museum (Nat. Hist.) Collection. 
Genus Lasio'onops. New. gen. 
Head clothed with similar scales to Culex ; antennae with the basal joint with a few scales ; palpi 
short in both sexes. Thorax clothed with narrow-curved scales. Abdomen clothed with flat scales and 
with large projecting flat lateral scales, with deeply dentate apices, in more or less tufts. Wings with typical 
Culex scales and venation. 
This genus is separated from Culex on account of the peculiar and characteristic lateral scales on 
the abdomen, which give the insect a ragged appearance. 
A single species only at present occurs, L. poicilipes from West Africa. The $ is unknown. 
