CULICID FAUNA OF THE ADEN HINTERLAND. 625 



.Anopheles arabiensis n. sp. 



Palpi, three white bands, remainder brown, thorax mouldy with silvery hair- 

 like curved scales. Abdomen brown, covered with dark hairs. Legs banded 

 at all joints. 



Female. — Head black, occiput and nape covered with brown upright forked 

 scales. Long curved silvery hairs project over the eyes and clypeus. Scattered 

 over the back of the head there are a few narrow curved and spindle-shaped 

 scales. 



Palpi (Fig. 1) are not densely scaled and show three white bands including 

 the apices. The lowest band is about a third of the way up the palpus and 

 is intermediate in size. The central band is the smallest and the apical the 

 broadest. Proboscis brown with yellow apex. Clypeus dark-brown, antennas 

 are dark with silvery hairs, the basal joint being large and globular. 



Thorax light brown, anteriorly there are a few dark, forked and spindle- 

 shaped scales. Scattered over the dorsum there are long and short hair-like 

 curved scales. Prothoracic lobes have a few hairs on them. 



Abdomen has no scales on either surface, but long brown hairs. 



Wing (Fig. 2) is spotted, with costa showing 7 dark spots, four long ana 

 three short. Subcostal vein has two dark spots below the fifth and sixth 

 costal spots. The 1st longitudinal has four black spots, the second is divided 

 into two, sometimes three. The 2nd vein has two black spots on main stem, 

 two on upper and three on lower stem of each branch — often one spot is 

 wanting on each. The 3rd vein has two small patches near its origin and one 

 near its termination — this is most constant. The 4th long vein has two long 

 black spots on the main stem and two on each branch. The 5th has one 

 small spot on the main stem, two on the upper and one on the lower branch. 

 The 6th vein has three spots, one near its origin, one in the centre and one at 

 its termination. The wing fringe is dark with white areas at the junction of 

 all the veins and with a white spot between the junction of the (5th vein and 

 the base of the wing. This spot is sometimes absent. 



Legs dark brown with yellowish bands at all the joints. The femur and 

 tibia of the hind leg are speckled, the latter often has a well marked band 

 at its lower end, ungues are simple and equal. 



Male. — The upright forked scales are better marked, otherwise the cephalic 

 ornamentation is the same as in the female. 



Palpi (Fig. 1) are lightly scaled, the lowest band is the same as in the female, 

 though less distinct. The next band is situated at the junction of the club- 

 shaped apical segment with the lower end, then follows a long white band, 

 then a small black patch, which is sometimes wanting, and lastly the apex is 

 white. 



The thorax and abdomen are the same as in the female, sometimes a few 

 spindle-shaped scales are seen on the last abdominal segment. 



Genitalia. — Basal segment is curved and globular, covered with brown hairs, 

 apical segment is long and narrow terminating in a point. 



