ANOPHELES (SENSU LATO), WITH NOTES ON NOMENCLATURE. 143 
This species belongs to the genus Pyretophorus in Theobald’s classification, and 
is closely allied to A. pitchfordi, Power, and A. austeni?, Theo. From both it is 
distinguished by the bright yellow costa and first vein and by the small size of the 
fourth costal spot, while the dark areas on the veins are smaller and less numerous, 
so that the wing has a less mottled appearance. A. pitchfordi is also distinguished 
from A. flavicosta by the presence of a very small fifth costal spot. A. austeni 
has the first two costal spots joined into one, and has broader bands on the legs. 
Anopheles (Nyssorhynchus) watsoni, sp.n., ¢ Q. 
Closely allied to A. maculipalpis, Theo., and A. pretoriensis, Theo. From the 
former it is distinguished by the absence of spots on the palpi, and from both by 
the entire absence of spotting on the legs. In addition to this, the new species 
differs from its very near ally dA. pretoriensis in the banding of the hind tarsi. 
The hind legs in A. watsoni are marked as follows: narrow white bands on the 
apices of the tibie and first two tarsal joints; third to fifth tarsal joints 
white, except for a dark brown band of variable length near the base of the 
third joint. In A. pretoriensis the white band on the first two tarsal joints 
are markedly broader, that on the second joint being almost one-third as long as 
the joint itself. In A. watsoni, as in A. pretoriensis, there are no scales on the 
abdomen of the female, and only on the genital segment (occasionally a few also 
on the penultimate segment) of the male. 
There is also a general (though not very close) resemblance between this species 
and A.(Nyssorhynchus) aureosquamiger, Theo. Theobald placed A. aurcosquamiger 
in Pyretophorus, but as it has numerous flat scales on the scutum it belongs to the 
sub-genus Vyssorhynchus, in the sense in which it is here employed. 
This species bears the same relation to A. pretoriensis that A. ludlow? does to 
A, rossi, and it is a matter of opinion as to whether the spotting of the legs is a 
specific character or not. Banks regards A. ludlow? as a variety of A. rossi. 
NortTHERN Nigeria: Katagum, 3 ¢, 13 Q (Dr. C. E. 8. Watson) ; Minna, 
1 QO (J. J. Simpson), 
Types in the British Museum. 
