igio.] S. P. James : The Indian Anophelinse. 107 



that may be experienced in obtaining a good view of one of these 

 bodies. It will at once be seen whether or not the lobe carries a 

 cocade of scales projecting anteriorly. If the lobe carries such a 

 cocade the mosquito belongs to the genus Patagiamyia. (4) If a 

 tuft of scales is not present on the lobe next examine the dorsal 

 surface of the thorax. If the scales are long, sharp-pointed, and 

 very narrow (that is, if it is rather difficult at a first glance to say 

 whether they are scales or hairs) the mosquito belongs to the genus 

 Myzoinyia. If the scales are short and moderately broad (that is, 

 if it can at once be seen that they are true scales) the mosquito 

 belongs to the genus Pyretophorus. 



In the second case we shall have detected the presence of 

 scales as well as hairs on one or more of the abdominal segments. 

 In that case proceed as follows: (i) The first point to decide is 

 whether or not some of the scales are aggregated to form tufts. 

 The appearance of these tufts is shown in Plate XII; they are 

 very definite objects and the mistake must not be made of regard- 

 ing as tufts the irregularly disposed scales that in some species 

 overhang the sides of the terminal abdominal segments. The 

 single tuft projecting downwards from the mid line of the ventral 

 surface of the 7th abdominal segment in anophelines of the genus 

 Myzorhynchus is the least easy to detect. In specimens of that 

 genus w^e usuall}^ see no scales during the examination of the 

 dorsal surface, and even when the mosquito has been turned 

 upside down for the examination of the ventral surface, the 

 ventral tuft may not be recognized because its very dark scales 

 are viewed against the equally dark background of the abdomen. 

 It is not until the mosquito has been turned on its side that the 

 ventral tuft is easily seen. That is why it is so important not to 

 neglect the examination of the last abdominal segments from 

 every direction of view. If it is found that the abdomen carries 

 onh' this single ventral tuft of scales, w^e can say at once that the 

 mosquito belongs to the genus Myzorhynchus. The determination 

 should be confirmed b}^ finding that the thorax carries long, sharp- 

 pointed, myzomyia-like scales, and that the prothoracic lobes 

 carry a cocade of scales. (2) If on examining the dorsal surface 

 we see at once that it is clothed with very broad scales and that 

 tufts of scales project laterally from the sides of each segment, 

 the mosquito belongs to the genus C cilia. (3) If on examining the 

 dorsal surface we see that every segment carries scales and that 

 there are no lateral tufts, but that when the mosquito is turned on its 

 side a number of very prominent ventral tufts come into view, the 

 mosquito belongs to the genus Christopher sia. 



If our examination has shown that none of the abdominal 

 scales are aggregated to form tufts, it has to be decided whether 

 all the segments are provided with scales on their dorsal surface 

 or whether onl}^ the terminal segments carry scales. In the first 

 case the mosquito belongs to the genus Neocellia. In the second 

 case examine the thorax ; if the scales are short and Inroad the 

 mosquito belongs to the genus Nyssorhynchiis, if they are long, 



