244 Lt.-Col. A. Alcock on the 



Tlie subgenus Arrihalzagia is also essentially similar to 

 MyzorhynchuSj and shades into Anopheles through Anopheles 

 ffrabhamii, Theobald, and Anopheles 'vestitipennis , Dyar and 

 Knab. 



•The two series which constitute the subgenus Myzomyia 

 show the transition from such forms as Anojyheles gif/as, 

 Giles, and Anopheles wellcomei\ Theobald, to Nyssorhynchus. 

 The species known as '■^ Pyretophorus'''' coslalis is about as 

 nearly intermediate between Myzomijia and Nyssorhynchus, 

 in all respects, as can be imagined j and the significance of 

 its position is enhanced by the fact that it is a variable 

 species, some individuals leaning more towards Myzomyia^ 

 and others more towards Nyssorhynclius. 



All these considerations justify the conclusion iliat the 

 so-called "genera" of the jiroposed "subfamily" Anopheliiife 

 cannot be separately focussed as distinct generic conceptions, 

 but must all be merged in one generalization. 



a. Subgenus Anopheles, Meigen. 



(Including Anopheles and Stethomyia and Oychlepidopteron grahhtniii of 

 Theobald's Monograph, and Neostethopheles and Patagiamyia of James.) 



There may be some narrow scales on the pronoturn and 

 front of the scutum (or even, in one species, in the field of 

 the scutum), but the vestifure of the scutum consists mainly 

 of hairs, which are sparse. There may, very rarely indeed, 

 be a few narrow and inconspicuous scales on the genital 

 lobes, but tiie vestiture of the abdomen also consists of sparse 

 hairs. The wings are either unspotted or have a few dark 

 spots formed by clumps of scales, or they may have a few 

 colour spots, in which case not more than two of these — 

 distinctly formed — are present on the anterior costal edge. 

 The wing-scaljs are usually, but not always, long and narrow. 

 The palpi are usually slender. 



The subgenus is represented in all tlie great zoogeogra- 

 phical regions, though it only just enters the Ethiopian 

 region. 



h. Sul:genu8 Myzorhynchus, Bhmchard. 

 (Including Myzorhynchus and Lophoscelomyia of Theobald's Monograph.) 



There are no true scales in the field of the scutum, tliough 

 there may be some on its front edge and on the pronoturn. 

 Abdominal scales are restricted to a single outstanding tuft 

 on the ventral surface of the penultimate segment, except in 



