CULICID FAUNA OF THE ADEN HINTERLAND. 629 



the Gordon Memorial College Laboratory. It can be at once distinguished from 

 A. nili by the apical segment of the palpns being black, also by the two white 

 palpal bands. 



Anopheles (Nssorhynchus) tibani n. sp. 



Palpi three white bands, sometimes four, remainder black. Thorax black 

 with silvery mottling with many light curved scales. Legs banded, hind leg 

 has 2£-2§ segments pure white. 



Female. — Head black with silvery dots here and there ; occiput and nape 

 are covered with black, upright forked scales, scattered about are many white 

 spindle-shaped scales. A tuft of light hairs spread over the clypeus. Palpi 

 (Fig. 8) are black with three white bands including the apex, the bands are 

 arranged as follows : — A narrow white band is situated towards the base, 

 a broader band about the centre and an equally broad band at apex. 'J here is- 

 sometimes a narrow black band dividing the apical band into two. Proboscis 

 dark brown and longer than the palpi, clypeus is black. Antennae dark with 

 light and dark hairs, basal segments are globular and have a few white scales 

 on its inner side. 



Thorax. — Prothoracic lobes are black with long light curved hairs, dorsum 

 of thorax is covered with light and dark scales, with many spindle-shaped 

 scales. The dorsum has a general silvery appearance. Scutellum is dark 

 with a row of black bristles and scales. Metanotum is dark, halteres dark with 

 a few minute flat scales. 



Abdomen is covered with black hairs, there are a few scales on the last 

 abdominal segment. 



Wing (Fig. 9) is much spotted, costa has six dark spots and sub-costal two. 

 The first longitudinal has six spots, the central spot being divided into three. 

 The second vein has two dark spots on main stem, sometimes three and 

 two long ones on each branch. There is sometimes a second spot on lower 

 branch. The third longitudinal has a small basal spot and a long apical one, 

 this latter is occasionally divided into two unequal black spots. The fourth vein 

 has two spots on the main stems with two on the upper and two on the lower 

 branch. The fifth vein has two on the main stem, with two, often three on 

 upper and two on the lower branch. The sixth longitudinal vein has three dark 

 spots. The fringe is dark with light areas opposite the terminations of the 

 veins and their branches. 



Legs are black with many white spots ; hind leg (Fig. 10) has 2|-2f white, 

 tarsi, the first tarsus has its lower third covered with white scales, th* 

 remainder is black. The metatarsus has a distinct white band at its 

 lower end, this band is most constant, the remainder is speckled. The tibia 

 is spotted and has a distinct black band at its lower end. The femur is black 

 with many white spots. Mid-leg all the tarsi are black, the joints are white 

 metatarsus, tibia and femur black with many white spots. Fore-leg, the two 

 lowest tarsi are black, the second has a well marked and constant white band 

 the first also has a pale band at its distal end. 

 13 



