OO N. H. SWELLING REBEL AND J. M. H. SWELL ENGREBEL DE GRAAF. 



the second palpal joint of the female is white on the apical half, in N. pundulata it 

 bears a black sub-apical ring, separated however by a narrow light ring from the 

 basal black ring of the 3rd joint. We do not consider this difference of sufficient 

 value to justify a new species and consequently we rank N. tesselata as a variety 

 of N. jpunctulata. 



Donitz believed the var. tesselata to be peculiar to the western regions of the 

 Malay Archipelago only, but we have found it as far eastward as Ceram (Moluccas). 

 Donitz's typical punctidafa we have never met with. The eastern jpunctulata var. 

 tesselata differs however from the common western type, (a) by the larvae (p. 7.), 

 (h) by the light portion of the proboscis being distinctly diminished in size. 



6. Nyssorhynchus schiiffneri. 



Christophers (1916) seems to suggest that this species resembles N. fuliginosus 

 var. adiei, James. It is said to differ from it by the very short ultimate joint of the 

 female palpus. We found the length of this joint to be 11 per cent, of the palpal 

 length, the palpal index being 0*6, consequently it is an orthodactylous mosquito. 

 But there are other, more striking differences. The palps have 3 white bands only 

 (4 in adiei), with a long white tip resembling M. vaga. The wing, which in the var. 

 adiei is like that in N. fuliginosus (judging by James' description), is much lighter 

 in schiiffneri ; the black spots on the costa are rather narrow, on 2nd longitudinal 

 vein one small spot under the 3rd costal spot (reckoned from the apex). Stem 

 of 4th longitudinal vein nearly all yellow, so is the 3rd vein (in adiei it is black, 

 except for a few minute light spots). 



IV. Geographical Distribution. 



A considerable portion of the Malay Archipelago has been searched for Anophelines, 

 and although much remains to be done, we wish to draw attention to the following 

 striking features in the geographical distribution of certain species and varieties. 



1 . Nyssorhynchus annulipes var. moluccensis. 



Wherever it occurs this is a very common species, breeding everywhere, and so 

 it is difficult to overlook it. Still it has never been found in Sumatra, Java, Borneo, 

 Celebes and the smaller islands of the western portion of the Archipelago, but it 

 is the commonest Anopheline in the Moluccas and New Guinea. It is closely 

 allied to the Australian N. annidipes and its distribution is in accordance with other 

 zoological findings, showing the fauna of the eastern Archipelago to be mainly 

 Australian. It is well known that Wallace divided the Archipelago into an Asiatic 

 and an Australian region by a line following the Straits of Macassar and of Lombok. 

 The Anophelines (and with them other animals ; cf. Weber 1902) do not conform 

 to this scheme, as the Anopheline fauna of Celebes, so far as we know at present, 

 is purely Asiatic. 



2. Nyssorhynchus schiiffneri. 



So far as we yet know, this species is confined to the western provinces of Java 

 (Batavia, Bantam) and the neighbouring Lampong districts of South Sumatra, 

 which are separated from the former by the Soenda Strait. 



