INSECTS OF SAMOA. 



somewhat confused : Ceylon, iSlilgiris, Bhutan, Java, and Sumatra for N. vigaia ; Sikkim, 

 Assam, Formosa, Malaya, Borneo, and Celebes for N. inordinata. 



Grouped first by the structure of the hind leg and then regionally, the 

 forms of Nadagara present themselves as follows : 



I. Hind tibia of not dilated : 

 Formosan : N. umbrifera (kuj. gen. ?). 



Indo-Malayan : N. vigaia and N. inordinata (see note B, supra), N. orbi- 

 puncta (N.W. India), A T . epopsioneura (N.B. India), A T . synocha (Malaya, Java, 

 Sumatra), N. intractata (Borneo, Singapore). 



Papuan : N. cuneigera (huj. gen. ?). 



II. Hind tibia of dilated : 



Malayan : N. comprensata (Andaman Is., Nicobar Is., Penang, Borneo, 

 Toekan Besi), N. scitilineata (Borneo, Perak, Hainan), N. odontias (Perak), 

 N. reprensata (Java, Perak). 



Moluccan : A T . dohertyi (Batjan). 



Melanesian : N. extractata, N. tractata and N. irretracta (see note B, supra), 

 N. extensipennis (British New Guinea, Rook I.), N. synodoneura (Dutch and 

 British New Guinea). 



Australian : ? N. argyrosticha Turner (Queensland) — unknown, but the 

 species almost certainly belongs to the same group as A 7 , extensipennis and 

 N. synodoneura. 



Polynesian : sp. n., Samoa. 



From the above outline, it is clear that there are still many lacunae in our 

 knowledge of the geographical distribution of the known species, as indeed is 

 the case with all but a few of the most conspicuous of the Indo- Australian 

 genera of Geometridae. I think, however, that we already know enough to 

 support the view that the higher " secondary sexual " developments in this 

 genus are eastern and the simpler forms western, and the consequent expecta- 

 tion that any further Polynesian Nadagara that may be discovered will belong- 

 to our Group 11^ — probably, if one may hazard a more definite guess, to the 

 vicinity again of N. irretracta. It will be noticed that of the eight species recorded 

 from the Malay Peninsula and the Greater Sunda Is., four belong to each group, 

 whereas all the four known to occur in India are in Group I and all the Melanesian 



