CHARACTERISTICS OF LARV.^ OF ANOPHELINA. 115 



requirements has neither scientific basis nor practical 

 advantage. The requirements are not complied with 

 throug'hout Theobald's grouping-, which is based also entirely 

 on imagines. 



If the points of difference between the larvae of different 

 species of Anophelina generally were slight and unim- 

 portant, there might be sound reason for generic groupings 

 on the features of imagines alone, but the differences are 

 certainly as great and cjuite as definite as those between the 

 different imagines. It is therefore desirable that the larval 

 characteristics be given an equal weight with those of the fly. 

 In Theobald's ' Monograph of the Culicidte of the World ' 

 (vol. iii, p. 10) is found a table of genera with characteristics 

 which are here abbreviated : 



Anopheles . . Thorax and alidomen with Wing scales lanceo- 



liair-like ciirved scales late. 



Myzomyia . ' . Ditto Wing scales mostly 



long and narrow. 

 Pyretophorns . ThoraxwitlmaiTow curved Wing scales small, 



scales ; abdomen liaiiy lanceolate, or nar- 



rowed. 

 Nyssor Lynch us . Thorax and ahdoiuen with Wing scales bluntly 



tiiie scales ; lateral tufts lanceolate. 



and dorsal patches of 



small flat scales 

 Cellia . . . Thorax and abdomen true Ditto. 



scales. Al>domen nearly 



completely scaled with 



lateral tufts 

 Myzorliynclius . Thorax with hair-like Wing scales broadly 



cm-ved scales. Abdo- lanceolate. 



minal scales on venter 



only, with distinct apical 



tuft ; no lateral tufts 



Of the last two genera the characteristics appear to be 

 definite and distinctive, but the features of the first three are 

 very variable in practice, and such as to render distinction 

 very difficult. Xy ssorhynchus, as far as can be judged 

 from description of different species, merges in Cellia on the 



