SPECIES OF CULEX AND ALLIED GENERA, 247 
The genus Ochlerotatus is certainly well founded, and is accepted here in its 
original sense, with the slight modification necessary for the inclusion of 
Culicelsa, O. albifasciatus, Meq., the type of the genus, is unrepresented in the 
British Museum Collection, two specimens so named by Walker certainly 
being wrongly identified. O. (Leucomyia) scapularis, Rond., is of precisely the 
same type as the species tabulated below, and is certainly not congeneric with 
the other species of Leuwcomyia, which are here included in Culex. 
Theobald in publishing Grabhamia did not cite a type in any way, and Dyar 
(Proc. Ent. Soc. Washington, 1905, p. 48) specified Culex dorsalis, Mg., as the 
type; Felt, however, had previously (loc. cit.) chosen C. jamaicens?s, Theo., 
which appears to be a true Culex. The genus Grabhamia, therefore, is not 
synonymous with Ochlerotatus and Culicada, but with Culew. 
Ochlerotatus is mainly a Palaearctic genus, comparatively few species 
occurring within the tropics, where, on the other hand, Culex is more largely 
developed. The Culicelsa group includes (besides C. taeniorhynchus, Wied., 
the type, and the African species given below), Culex vigilax, Skuse, Taenior- 
hynchus niger, Giles (which is very close indeed to C. taentorhynchus, Wied.) 
and others. C. alboannulatus, Meq., is a true Ochlerotatus. C. accraensis, Theo. 
(neotaeniorhynchus, Theo.) isa Culex. In addition to the differences in ungues 
and male palpi, Ochlerotatus seems to differ from Culex in the structure of the 
male antennae, the plumes arising from the dorsal and ventral surfaces of the 
antenna only, instead of in whorls as in C. pipiens. Whether the two genera 
can always be distinguished in this way I am unable to say, as time has not 
allowed the examination of the antennae of very many species. 
1. Hind ungues toothed in both sexes (Ochlerotatus, s. stv.) ... Ais Zs 
4 » simple in gd ts Ase vu aoe mer ate 6. 
2. Tarsi unbanded... uae : eee uh cs 3. 
Tarsal joints banded at both thee midis apex... see <6 Abe 5. 
3. Abdomen unbanded, but in Q with very small median Bical pale 
spots ... AA sy S60 a a wo. Le. cummins?. 
Abdominal cenments pace banded ne a as So 4, 
4, Thorax more or less ornamented ith pale lines; wings without 
light scales... xt a 384 aa. ae .. 2. dentatus. 
Thorax uniformly scaled; wings with light and dark scales 
(N. Africa and Europe only ) he bas i 1. 3. Nemorosus. 
5. Banding of tarsi rather broad ; abdominal segments with pairs of 
dark Brie be: se an is : ; - -.. 4, dorsalis. 
Banding of tarsi narrow ; sidan sleet all male » od. longisquamosus 
6. Hind ungues simple in both sexes (Culicelsa) ae ae me ih 
5 » toothed in female Sa 7 ts it t-.tll PLD: 
7. Legs banded... ae. Ahi rs ods de fae oe 8. 
»» unbanded ... ay whe ; Be Sh #8; est. Ailey, 
8. Tarsal joints with apical and basal pantie ok 6. puleritars?s. 
ij 53 basal banding only us ae eds 9. 
9. Wings mottled with black and oe scales ; dark Bineies rate BLO; 
»» not mottled ; more brownish species ; costal fringe whitish 
beyond middle i as ana wan Us hansutes, 
10, Abdominal segments with apic nl lateral Pellowish spots 8, durbanensis, 
45 af without such spots wate awe 29, nigeriensis, 
