LIST OF THE ANOPHELINES OF THE MALAY ARCHIPELAGO. 89 



As we do not think it advisable to throw these two forms together, we propose 

 a purely artificial but easily observable distinction, viz. : — 



(a) No spot on base of 3rd vein M. aconila, Don. 



(h) A small spot present (length about J of the 1st submarginal cell), 



M. aconita var. cohaesa, Don. 

 (c) A long spot present (from half as long to as long as this cell) . . minima, Theo. 



3. Myzomyia vaga (indefinita). 



The species known under the name of M. indefinita, Ludl. (1904) is separated 

 from M. rossii by (a) a narrow black band at the base of the light apex of the female 

 palpi ; (6) a light spot at the apex of the proboscis in the female, behind the labella ; 

 (c) a lighter colour ; (d) its larger size ; (e) the larva. The points (a), (c) and (d) 

 are subject to great variation, (6) and (e) being constant and reliable ; as (6) is not 

 present in the males and (a) only refers to the females, the males cannot be dis- 

 tinguished with certainty. 



In 1902 Donitz described under the name A. vagus a mosquito distinct from 

 although resembling M. rossii. The proboscis of the female is described as being 

 black, with light apex and whitish labella. The palpi of the female are black, 

 the terminal joints white, the penultimate with a broad black band around the base. 

 A distinct variety from Celebes has the penultimate joint of the female palpus 

 white only at the apex. As this is the condition actually existing in M. rossii we 

 infer that the specimen on which the species vagus was founded had a narrower 

 black palpal band. The species was described from a female caught at Fort de 

 Koch (Sumatra) and we know that no M. rossii has ever been found there. From 

 the description of the proboscis and palps of the female (in connection with the 

 description of the variety from Celebes) and the origin of the type we believe that 

 there can hardly be any doubt that Donitz 's vagics and the species now called 

 A. indefinitus are identical. 



Christophers (1916) suggests that Giles' M. rossii might be the one with the 

 broad white apex of the palps. As Giles (1900) states that the apical half of the 

 end joint {i.e., of the two terminal joints taken together) is white in the female, 

 we believe this supposition to be not well founded. On the other hand we believe 

 him to be quite right in suggesting that Ludlow's indefinita is indeed M. rossii, 

 Giles, as she distinctly states (1904) that the palpal markings and general colour 

 of her new species are like those of M. ludlowi. 



4. Difference between Myzomyia ludlowi and M. rossii. 



The following wing marking is very constant and reliable : on the upper branch 

 of the 5th vein, below the cross- veins, both species show two spots, which however 

 in M. rossii (and M. vaga) are short, whereas in M. ludlowi they are much longer. 

 An extensive biometrical research has convinced us that exceptions to this rule are 

 rare (Swellengrebel 1916, Mangkoe Winoto 1918). 



5. Neomyzomyia punctulata and N. tesselata (A. deceptor, Don.). 



One of us has shown already that the characters differentiating these two species, 

 so far as they are based on the wing markings, cannot be accepted as valid. Con- 

 sequently the species are separated only by the palpal markings : in N. tesselata 

 (681) o 



