268 



F. W. EDWARDS. 



are added, comprise all the species dealt with in this paper, except A. mauritianas 

 and A . sergenti. It will be noted that the species in which the air-floats have under- 

 gone great reduction are A. plumbeiis, A. eluhis, A. multicolor and A. turkhudi. 

 Dr. G. A. K. Marshall suggests that this reduction may be connected with the habit 



Fig. 1. — Eggs of Palaearctic .species of Anopheles. a, A. plumbeiis, Steph. (original) ; 

 h, A. algeriensis, Theo. (after Sergent) ; c, A. bifurcatus, L. (after Martini) ; d. A. maculipennis, 

 Mg. (original) ; e, A. elutus, sp. n. (original) ; f, A. hyrcanus (Pall.) (original) ; g, A. pulcherrimus 

 Theo. (after Stephens and Christophers) ; h, A. stepkensi, Theo. (after Stephens and Christophers) ; 

 ■i, A. costalis, Theo. (after Patton) ; j, A. rhodesiensis, Theo. (after Patton) ; k, A. multicolor, 

 Camb. (after Foley) ; /, A. turhhudi, Liston (after Stephens and Christophers) ; ni, A. hispaniola, 



Theo. (after Sergent). 



of breeding in water of high specific gravity (tanninised water in the case of^. 

 ■plumbeiis, saline water in the case of ^. mtdticolor), in which large floats would perhaps 

 not be necessary in order to keep the eggs on the surface during incubation. It is 

 uncertain whether this explanation will apply to A. elutus and A. turkhudi. 



Subgenus Anopheles, Christophers. 



Ind. Journ. Med. Res. iii, p. 383 (1915). 



Adidt. — Cross- veins and bases of forks of wing- veins with dark scales. Costa 

 largely dark (in Palaearctic species), with at most two pale spots, apart from a pale 

 area in the apical fringe. Male hypopygium with two (rarel}^ one or three) strong 

 spines at the bases of the side-pieces, one or both of which are borne on a strong 

 tubercle. Prosternal hairs usually numerous. 



