Anopheles barbirostris. 



The costa is almost entirely black, save for a few white scales 

 at its distal extremity, and a few at the junction of the outer and 

 middle-third of its course.* 



The first lono- vein has a few white scales near its commence- 



o 



ment, and again a few at the situation of the inner spot on the costa. 



The second long vein is entirely dark scaled, except for two 

 small patches of white scales on its posterior branch. 



The third long vein is mainly covered with dark scales, but the 

 dark scales are interrupted here and there throughout the length 

 of the vein by a few white scales. 



The fourth long vein is dark-scaled on the main trunk, but the 



o 



dark scales are mingled with light scales on both anterior and 

 posterior branches. 



The fifth long vein is irregularly covered with dark and light 

 scales ; the light scales only predominate at two points on each 

 branch of this vein, forming here distinct light spots. 



The sixth long vein shows two distinct white-scaled spots, one 

 near the middle of the vein, another near its termination. 



The wing fringe is for the most part dark, but there is a light 

 distinct spot at the apex of the wing, and another opposite the 

 extremity of the posterior branch of the fifth long vein. 



The legs are of a dark brown colour, and have light scales 

 at all the joints. None of the hind tarsal segments are white in 

 their whole length. 



Characters of the larva. PL V, fig. 1. The larvae of this 

 species are easily identified by the naked eye from their large size, 

 black colour, and the fact that when resting at the surface of the 

 water they are nearly always bent more or less in the shape of an S. 

 Their microscopical characters are shown in the figure. The 

 external frontal hairs are converted into a large tuft or '< cocade," 

 which is easily seen projecting from the front of the head. On the 

 inner side of each antenna is a large branching hair. 



* The reader is strongly advised to refer constantly to the coloured plates when 

 going through the descriptions of the markings on the palpi, wings, and legs of the 

 different species. He will obtain little profit from merely reading the descriptions, and, 

 unless he carefully follows out on the coloured plates the markings that are described in 

 the text, he will find the subject very confusing and uninteresting. The beginner may, 

 at this stage, derive some help from a second reading of pages 28 to 33, and the table on 

 page 32 should be kept constantly in mind. 



78] 



