202 F. W. EDWARDS. 



Genus Toxorhynchites, Tlieo. 

 Toxorhynchites regius, Tonnent. 



Cukx regius, Tennent, " Ceylon," p. 268 (1859). 



Megarhiuus ihtntiserkofs, Theo., Mon. Cul. i, p. 225 (1901). 



Megarhinus gilesii, Theo., Mon. Cul. i, p. 227 (1901). 



Toxorhy)ichites inimisericors, Theo. et auct. {uec Walk.). 



The only description given by Tennent is ' ' one with a formidable hooked probo.>ci8," 

 but this is sufficient to identify the species, since apart from the rare and inconspicuous 

 T. mmintus it is the only member of the genus which is known to occur in Ceylon. 

 Theobald also states that he has seen Thwaites' specimens to wliich Tennent referred. 



Toxorhynchites subulifer, Dol. 



Megarhinus subulifei-, Dol., Nat. Tijd. Ned. Ind., xiv, p. 382 (1857). 



Megarhinus iuimisericors, Walk., Proc. Linn. Soc. London, iv, p. 91 (1860). 



On re-examining AValker's types (from Celebes) I find they are distinct from the 

 Oriental form which has been commonly known as T. immisericors, and therefore this 

 name could not be used even if C. regius had not been published a year earlier. The 

 chief points of difference are that in the Celebes species there are no lateral yellowish 

 spots on the third and fifth abdominal tergites, while the fifth and sixth sternites are 

 almost entirely purple, instead of being yellowish with a rather narrow purple stripe 

 down the middle. There seems to be nothing in Doleschall's description of M. svhulifer 

 to distinguish it fi'om T. inimisericors, and as both were described from the Austra- 

 lasian region it wiXi probably be safe to assume that they are the same. By so doing 

 the confusion A\ill be avoided which would result if Walker's name were now used 

 in a different sense from that in which Theobald employed it. Doleschall's 

 M. amboinemis is evidently a different species. 



CJenus Aedes, Mg. 



After further study of both larvae and adults of a large number of species of the 

 Aedes group, I am now inclined to accept the view of Dyar and Knab that it vdW be 

 most convenient to include almost all these forms within the single genus Aedes, 

 chiefly owing to the fact that there are so many intermediate forms, as regards the 

 structure and length of the palpi and the shape of the scales, that any clear-cut 

 division, even on unisexual characters, would seem to be impossible. The diversity 

 of structure however is very much greater than it is in Anopheles, and it may therefore 

 be justifiable to retain as subgenera some of the groups which have hitherto been 

 regarded as genera. The number and exact limits of these subgenera cannot be 

 decided upon until the mosquitos of this group are more thoroughly known ; the 

 follo\ving are rough definitions of the most important groups, but allowance mnst 

 always be made for annectent species. 



(1) Subgenus Armigeres, Theo. — Larval siphon without pecten ; tuft minute or 

 absent. Claspers of male genitalia usually with numerous articulated spines, very 

 rarely only one. Male palpi always (so far as known) long, thin, without hair-tufts. 

 Female claws always toothed ; middle claws of male usually equal. Dark species 

 with dark legs and flat scales on the head and scutellum. 



