184 August, 



I have pleasure in dedicating it to my friend and colleague Dr. J. W. H. 



Harrison. 



JPerrisia harrisoni, nova. nov. 



for Dasi/neura jaapiana Riibs. (pre-occupied), 1917, Sitz. Ges. Natur- 

 forsch. Fr., Berlin, 1917^ p. 50. 



This species is probaljlj' referable to the Cecidomi/iilarum sp. 

 recentl3' recorded (Bagnall & Harrison, Ent. llec. xxxiv, p. 61) as an 

 inquiline in galls of JPerrisia ulmariae, and not B. & H. 119 as sug- 

 gested (/. c. xxxiii, p. 154), but further investigation is necessary before 

 the point can be decided. 



15 Grey Street, Newcastle-on-Tyiie. 

 June imi, ]922. 



EMPIDIDAE FROM THE SEYCHELLES. 

 13 Y .TAMES E. COLLTX, F.E.S. 



[The following article forms part of the results of the Percy Sladen 

 Trust Expedition to the western Indian Ocean under Professoi- J. 

 Stanley Gardiner, F.Ii.S., in 1905 and 1908-9. Most of these reports 

 are published in a special series of volumes. Trans. Linn. Soc. London, 

 ser. 2 (Zool.j, xii-xviii (from 1907 onwards). But it has not been pos- 

 sible to include them all in those volumes, and I am indebted to the 

 Editors of the Ent. Mo. Mag. for allowing this account of the 

 JEmpididae to appear here. 



The material of this family belongs to 5 species representing 4 

 genera. The specimens were all collected in the Seychelles, and, with 

 one exception, at high elevations in or near the endemic forests of the 

 islands of Mahe and Silhouette. The one exception is Drapetis angus- 

 tata, sp. n., all the examples of which were taken near sea-level, some 

 on a cviltivated islet, the rest on marshy ground in Mahe. Of the 5 

 species, the first two are referred (with some reservation) resjoectively to 

 a South African and to a New Guinea species : the other three are 

 described as new. 



The other reports on the Diptera of this Expedition will be found as 

 follows: — Cecidomyiidae, by J. J. Kietfer, Tr. Linn. Soc. xiv, pp. 315-330 

 (1911); Chironomidoe, id., t. c. pp. 331-366, pi. 21 (1911); Mycetophilidae, 

 G. Enderleiu, t. c. pp. 59-81 (1910) ; Sciaridae, id., up. cit. xv, pp. 181-194, 

 pi. 9 (1912); Psi/ckodidae, A. E. Eaton, f.c. pp. 423-432, pi. 26 (1913); 

 Scatopsidae, fSivudiidae, G. Enderlein, op. cit. xvi, pp. 373-375 (1914) ; 

 Tipulidae, F. W. Edwards, op. cit. xv, pp. 195-214, pis. 10, 11 (1912); 

 Culicidae, F. V. Tlieobald, t. c. pp. 81-94, pi. 4 (1912); Stratinmyiidae, 

 K. Kertesz, t. c. pp. 95-99 (1912) ; Tabanidae, E. E. Austen, Bull. Ent. Research, 



