370 PERCY SLADEN TRUST EXPEDITION 
Addenda and corrigenda to the author’s report on Sapromyzide, Chloropide &c. 
(Vol. xv of these Transactions, Part 3, 1912, pp. 303—348, and Plates 15, 16). 
Omission. , Family Sapromyzide. 
In the paper on the Sapromyzide (op cit., pp. 307—316) the condition of the 
terminal scutellar bristles of the genus Sapromyza was unfortunately omitted. They are 
crossed or much convergent except on S. nudiuscula where they diverge strongly. 
Nomenciature. Family Chloropide (op. c7t. pp. 329—343). 
Just previously to the publication of the above an important paper by Herr T. Becker 
appeared in the Ann. Mus. Nat. Hung. for 1912. In that paper the names oculata and 
longipennis were used for two species of Oscinis. Hence those names are preoccupied. 
On communicating with Herr Becker he was good enough (at the author's request) to 
suggest names for the two Seychelles species whose names are preoccupied ; these names 
are complicata for oculata and colorata for longipennis. 
Further, on p. 249 of the same paper Herr Becker describes an Oscinella acuticornis 
from Abyssinia which is the same as the Oscinis acuticornis of the above Seychelles 
paper. Herr Becker also states that he considers this species and a similar one to be 
representative of a new genus Paroscinella. The synonymy must therefore read :— 
Os. oculata Lamb (op. cit., p. 340) = Os. complicata Beck., nom. nov. 
Os. longipennis Lamb (op. cit., p. 342) = Os. colorata Beck., nom. nov. 
Os. acuticorms Lamb (op. cit., p. 340) = Oscinella acuticorms Beck. 
Note on Geographical Distribution. 
Owing to the little knowledge there is of the enormous number of acalyptrate forms 
that must exist in the world fauna, it is very difficult to draw any strong conclusions 
from the insects recorded in this and the previous paper. This matter is rendered still 
more inconclusive by reason of the fact that so many Dipterous genera have representatives 
over almost all the world. The general aspect of the Seychelles acalyptrates, however, is 
that of the African fauna. Several species are common to both (as for example Llythea 
inwenata, Anatricus arenaceus, Zaprionus vittiger, Plagiostenopterina submetallica), 
while many others are manifestly related to African forms (eg. Sapromyza striata, 
Meroscins, Rhabdocheta). 
The occurrence of the typical 8S. American genus Acrosticta is of much interest, 
as it occurs also in Hawaii. A similar case is that of the Chilian genus Hccoptomma. 
The New Guinea genus Allometopon is worth noting. 
It is probable that further research will show that several of the new species are really 
very widely spread, but the collecting of small flies is so much neglected, that it will be 
long before any adequate information is available on the question. 
The author desires to express his gratitude to Mr J. E. Collin, F.E.S., of Newmarket, 
and to Herr F. Hendel of Vienna; both gentlemen freely placed their unrivalled knowledge 
and judgment at his service. 

