24:2 Lt.-Col. A. Alcock on the 



as the proboscis in both sexes, clubbed in the niale. Proboscis 

 of tlie usual form. 



Scutum clothed eitiier with hairs or with scales, wliich 

 seldom lorm a dense coat. Scutellum with the free edge 

 simply convex. Metanotum glabrous. 



Abdomen clothed either witii sparse hairs or with scales 

 and hairs, the scales (when present) being often localized 

 and inconspicuous, but sometimes conspicuous and fairly 

 abundant. 



Wings as a rule, to which, however, there are nximerous 

 exceptions, spotted. 



In repose the body of the insect is, as a rule, inclined at an 

 angle with the surface of rest. 



The larva has no breathing-tube and is provided with two 

 latero-dorsal series of fan-like tufts of scales on a varying 

 number of the abdominal segments. 



For the sake of convenience the species that compose the 

 genus may be grouped in subgenera according to the following 

 table ; but the groups, though they can be defined with 

 sufficient precision, grade into one another: — 



Si/nojpsis of Subgenera of Anopheles. 



A. The covering of the scutum consists mainly either 



of hairs or of nan-ow faleulate ,«cales. (In any- 

 doubtful case the palpi are slender, i. e. not 

 shaggy with outstanding scales.) =1. 



B. The covering of the scutum consists mainly of 



broadish elliptical, commoul}- recumbent scales = 2. 

 'Abdomen either without scales or with some in- 

 conspicuous narrow scales on the genital lobes 

 and terminal segment, or with a tuft of scales 

 on the ventral surface of tlie penultimate seg- 

 ment = 3. 



1.-^ Abdomen with an outstanding tuft of stiff and 

 slender scales of extraordinary length on either 



side of every segment = Oirufi/a. 



Abdomf^n with broad and very conspicuous scales 

 on several segments, some of the scales some- 

 i times forming regular and outstanding tufts . . = Arribah igia. 

 f Wings either not spotted at all or having a few- 

 dark spots formed merely by clumps of scales, 

 or if " variegated " then there are not more 

 than two distinctly formed colour-spots on the 

 anterior edge. (In ambiguous cases, e. ;/. whe'e 

 a spot at the tip of the wing mi>:ht be reckoned 



3.-{ as anterior, then the palpi are shaggy.) =4. 



"Wings usually much spotted in contrasted colours, 

 their anterior edge barred or branded -with nu- 

 merous alternate dark and light spots or streaks. 

 (In any ambiguous case the palpi are not shag-gy.) 

 Inconspicuous scales occasionally present on tiie 

 1 terminal abdominal segment anil genital lobes. . = Mjiztmt/ia. 



