CULICID FAUNA OF THE ADEN HINTERLAND. 635 



buckets, etc. An attempt was made to try and exterminate this p e st in Aden, 

 and what was at first thought to be a simple matter turned out to be most 

 difficult. The eggs are capable of hatching after sinking and it was thus not 

 easy to be sure when emptying a barrel of removing all the eggs. The only 

 sure method was constantly oiling the water, which destroyed the larvae when 

 they hatched. The bite of this mosquito is most irritating, a large lump being 

 raised in a short time where the mosquito inserted its proboscis. The male of 

 this species does not bite like that of S.fasciata. It invariably accompanies 

 the female and will alight on one's body but never bite. It is troublesome in 

 the early morning and at mid-day. 



The larvae are exceedingly active and are able to remain a long time below 

 the surface. It was never found breeding in running water. 



TjENIORIiynchus tenax Theobald. 

 Banded Arabian variety. 



Macdlipes arabiensis. Mono Culicid II, 198 (1901), and III, 258 (1903) ; 

 First Report Wellcome Research Laboratories, Gordon Wellcome College, 

 p. 78 (1904). 



This species is closely related to the type except that the abdomen is very 

 distinctly banded and all the femora have pale basal band. The joints are all 

 banded. The male palpi have four white bands. In all other respects it 

 corresponds with the type. 



Larva. — This larva is exceedingly characteristic, it is green and has a long 

 thin syphon tube. It is always found in pools where there is much spirogyra. 

 It rests below the surface among the green strands and is thus most difficult to 

 find. It can remain a long time below the surface only very occasionally 

 coming up for air. 



Habitat and Observations. — It was found in the springs at D'thala, and at 

 Hardeba and in the river at Nobat. It is curious that the male of the type 

 was only recently described in the Report of the Gordon College Labora- 

 tories. Mr. Theobald agreed with me it was a banded variety of Tceniorhynchus 

 tenax, Theobald. 



Culex pipiens Linneus. 



For Suca (1758) Linneus ; Mono Culicid II, 132 (1901) and III, 224 (1913), 

 Theobald ; First Report Wellcome Research Laboratories, Gordon Memorial 

 College, p. 76 (1904). 



This mosquito was in all the springs and wells about D'thala, also up at 



Jehaf. It was found at the highest point 7,000 odd feet breeding in pools 



of rain water that collected in holes in rocks. It is abundant at Hardeba and 



Nobat. 



Culex fatigans Wiedemann. 



Auss. Liver. Insect p. 10 (1828) Wied., ft ono Culicid II., p. 151 (1901), 

 Theobald, and III, p. 225 U903). 



This is the most common mosquito in the district and is practically found 

 everywhere, breeding in springs, wells and puddles. It was found on Jehaf. 



