N 



32 PROF. M. BEZZI. 



proboscis is very variable in the different species, I think it is better to restrict, 

 the genus to those in which the form of the head has the very characteristic shape 

 which may be seen in sonclii and in sororcula.. But in addition to these, the African: 

 fauna contains a number of species with a very long proboscis, in which the head 1 

 is less or not at all depressed, like dubia, anceps, ignobilis ; even these species must- 

 be provisionally placed here. The species in which the apical part of the proboscis, 

 is shorter than the lower part of the head, are to be placed in Euribia, the genus. 

 Oxyna being restricted to the very peculiar group of fiavescens and closely allied 

 forms. 



Thus defined, the artificial genus Ensina will contain the following Ethiopian 

 species : — 

 1(2). Head depressed, with the lower border very long ; wings with a faint and 

 scattered reticulation . . . . . . . . . . sororcula, Wied. 



2(1). Head not or less depressed, with the lower border less elongate. 

 3(6). Wings banded, i.e., with the reticulation reduced to form some dark bands.. 

 4(5). Apex of the wings, between the ends of 3rd and 4th longitudinal veins, with 

 a hyaline spot . . . . . . . . . . . . myiopitoides, BezzL 



5(4). Apex of the wings between the above-named veins entirely black 



anceps, Loew>. 

 6(3). Wings reticulate as usual. 

 7(10). Stigma black, with or without hyaline spot ; wing pattern of a dark brown 



colour. 

 8(9). Femora yellow ; first basal cell, and the submarginal and discoidal cells 

 at base with very numerous hyaline spots ; stigma black dubia, Walk. 

 9(8). Femora with black base ; the above-named cells with only a few hyaline 

 spots ; stigma with a more or less developed hyaline spot 



ignobilis, Loew. . 

 10(7). Stigma yellow ; femora yellow ; wings with a very faint pattern 



siphonina, sp. n. 



1. Ensina sorocula, Wiedemann (1830). 



A typical Ensina, which has a very wide distribution in tropical and subtropical 

 countries of the Old World, and possibly even in America, piceiola or humilis being 

 probably only a variety of it. 



The male of El bisetosa, Enderlein (1911), from Formosa, is this same species, while 

 the female belongs to some other species. 



There are in the collection several specimens from Nyasaland, Chiromo, Buo B., 

 May 1916 {R. C. Wood) ; from Durban, Umbilo, 24. v. 1916 (L. Bevis) ; and I have 

 received numerous specimens from Erythraea, Ghinda, March 1916 (Dr. A. Mochi). 

 In my paper of 1908 the species is recorded under the name of vacillans, Wollaston. 



2. Ensina myiopitoides, Bezzi, Bull. Soc. Ent. Ital., xxxix (1907), 1908, p. 158. 

 Becognisable by the brown pattern of the wings being disposed in bands, though .. 



not so distinctly as in the following species. 

 Described from Erythraea, Adi Ugri, and not found subsequently. 



