80 INSECUTOR INSClTliE MENSTRUUS 



45. Harpago with very long subapical seta oswaldi Lutz 



Harpago with subapical seta minute, 



thorntoni Dyar and Knab, podographicus Dyar and Knab 



Group I (Howardina Theobald) 



46. Basal appendages absent walkeri Theobald 



Basal appendages present 47 



47. Seta of harpago as long as its conical base 48 



This seta twice as long as its short base fulinthorax Lutz 



48. Clasp filament slender, longer than side piece, 



albonotata Coquillett 

 Clasp filament stouter, shorter than the side piece, 



busckii Coquillett, aureostriata Grabham 



Old World series 



49. A modified structure representing the clasp filament, furcate at 



tip and with a projection at base cinereus Meigen 



Clasp filament normal or subnormal 50 



50. Clasp filament flattened, with claw inserted subapically, 



vexans Meigen 

 Clasp filament simple, normal argenteus Poiret 



To turn now to the Old World forms. My knowledge of 

 these is limited ; but, fortunately, a valuable paper by F. W. 

 Edwards^ is available. Edwards accepts the wide interpreta- 

 tion of Aedes as proposed by Mr. Knab and myself ; but he 

 does not make the distinction between the New World and 

 Old World types here suggested. This difiference is certainly 

 not obvious in the female adult, with which Mr. Edwards was 

 largely dealing; but I am not entirely hopeless that some char- 

 acter may be found, now that attention has been directed to 

 the matter. 



Edwards uses genitalic and other adult characters, the 

 genitalic being supplementary. His classification is as follows : 



Genus A'cdes Meigen. 



Subgenus 1. Armigcrcs Theobald. 

 Subgenus 2. Stegomyia Theobald. 

 Subgenus 3. Ochlerotatus Arribalzaga. 

 Group a. Finlaya Theobald. 

 Group b. Diceromyia Theobald. 



> Bull. Knt. Research, vii. 201-229. 191' 



