Anopheles stephensi. 



17. ANOPHELES STEPHENSI (Listen). 

 (Coloured Plate XIII. Plate VI, Fig. 2, Plate X, Fig. 6.) 



References : Listen, Ind. Med. Gaz., December, 1901 ; Theobald, Monog. Culicid., 



Vol. Ill, p. 93. 



Synonyms, Nyssorhynchus Stephensi (Theobald). 

 A. metaboles (Theobald). 



Palpi with three white bands and some speckling ; thorax 

 covered with white scales ; abdomen with many scales and hairs ; 

 legs speckled but with none of the hind tarsal segments white in 

 their whole length ; wings spotted. 



Head covered with brown and white upright-forked scales ; a 

 prominent frontal tuft of white hairs projects forwards ; palpi with 

 three white bands ; the two outer equal and broad, the third narrow ; 

 tips of the palpi white ; on the dorsal aspect of the third segment 

 of each palp there are in addition one or two white-scaled spots. 



Proboscis brown-scaled with a yellowish tip ; antennas dark- 

 brown. 



Thorax covered on its dorsum with white scales and showing 

 an indistinct median and two lateral longitudinal dark lines ; lateral 

 aspects of the thorax dark. 



Scutellum with white scales and dark bristles. 



Abdomen brown, covered with numerous hairs and scales. 



Wing veins clothed with rather broad spindle-shaped scales. 



The costa shows six black-scaled areas ; the base of the costa 

 has dark scales, while the apex has white scales. 



The first long vein has four dark-scaled areas corresponding to 

 the four outer dark-scaled areas on the costa, but the third dark- 

 scaled area from the apex is divided into two by a narrow white- 

 scaled interruption, and is shorter than the corresponding costal mark. 



The second long vein has a single black-scaled area on the 

 main stem, and one on each of its branches ; the point of bifur- 

 cation is white-scaled. 



The third longf vein shows two small dark-scaled dots, one 



o 



near its origin, and the other near its termination. 



The fourth long vein shows two dark-scaled areas on the main 

 trunk, two on the anterior branch, and one on the posterior branch. 



The fifth long vein has a single dark-scaled spot on the trunk, 

 three on the anterior branch, and one on the posterior. 



