DIPTERA FROM NEPAL 113 



cases. In regard to the drosophilid fauna, Cryptochaetum nipponense, Drosophila 

 acutissima and D. lacertosa, which are common to both countries and are so-called 

 "wild species", and D. trizonaria and D. trisetosa, which are closely related to the 

 Japanese species, D. bizonata and D. sternopleuralis respectively, should be the 

 examples proving connection between fauna of the two countries. Table 2 shows 

 that one hundred and twenty-seven species, so far known from Japan, belong to 

 sixteen genera, of which ten also occur in Nepal. The remaining six genera, Curto- 

 notum, Amiota, Mycodrosophila, Dettopsomyia, Lissocephala , and Chymomyza have 

 not been found in Nepal, while five genera, Campichoeta, Apsinota, Lissodrosophila, 

 Diathoneura and Paramycodrosophila, recorded from Nepal in this paper, have not 

 been found in Japan. Six subgenera of the genus Drosophila (Scaptodrosophila, 

 Dichaetophora, Hirtodrosophila, Dorsilopha, Sophophora, and Drosophila s. str.) 

 occur in both countries. The subgenus Lordiphosa is absent from Nepal, while 

 occurring in Japan. The occurrence of an originally African subgenus, Dichaeto- 

 phora, in both Nepal and Japan is rather easily interpreted biogeographically, but the 

 discovery of an originally South American genus, Diathoneura, is harder to explain. 

 This might be a phenomenon of "trans-palaeo-equatorial distribution" (Maekawa, 



1963). 



The Nepalese species which also occur in Europe (five species), Australia (eight), 

 Africa (nine), N. America (four), and S. America (five) are mostly cosmopolitan or 

 circumtropical, except Campichoeta obscuripennis and Leucophenga leucozona, 

 which, outside Nepal, are found only in Europe and Australia, respectively. The 

 genus Leucophenga and the melanogaster-group are the taxa flourishing especially 

 in the Oriental Region and seem to have spread simultaneously to Nepal and Japan, 

 which have several species in common. 



