348 PERCY SLADEN TRUST EXPEDITION 
side views (Plate 20, fig. 34). It is, however, impossible to be absolutely certain of the 
constancy of the various minute differences that are apparent on prolonged examination, 
nor can they be exactly expressed in a manner suitable for description. 
The venation of the two species is practically identical (Fig. 31). 
Size and wings as last. 
Localities. Seychelles. Silhouette : Mare aux Cochons, over 1000 feet, IX. 1908. 
Mahé: Cascade Estate, at or above 800 feet, 1908—9. 
?¢ Corresponding to the above are many specimens of females, but it is practically 
impossible to sort them out, as apparently none were caught paired with males. 
Localities. These ?s were collected in Silhouette, Mahé (Cascade Estate and Mare 
aux Cochons district), and Félicité Islands. 
44. Drosophila, sp. 
? There are 5 specimens of a female of the melanogaster group which can be 
separated from the last two species by the second vein meeting the costa further down. 
In all other respects they are practically identical. In the absence of a male, the species 
is left undescribed. 
Localities. Seychelles. Silhouette: Mare aux Cochons, over 1000 feet. Félicité. 
ZAPRIONUS Coquillett, Proc. U. 8S. Nat. Mus., xxiv. (1902), 31. 
45. Zaprionus vittiger Coq., l.c. 32. 
Four specimens of this African species were collected. 
Localities. Seychelles. Silhouette: near Mont Pot-a-eau, ca. 1500 feet, VIII. 
1908 ; Mare aux Cochons, IX. 1908. Mahé: Cascade Estate, 800 feet or over, 1908—9. 
Cuymomyza Czerny, Zeitschr. fiir Syst. Hym. u. Dipt., i. (1908), p. 199. 
A single specimen of a new species of this genus was present. 
46. Chymomyza bicolor, n. sp. (Fig. 32 and Plate 20, fig. 35). 
Head. Eyes, very faintly and sparsely pubescent under high power. Top view:— 
frons shining, yellow, slightly lined; a very shallow narrow central depression from the 
ocelli to the large dull orange lunular arc: eye-margins broad and shining yellowish 
grey, extending forward to near the forehead. There are present the front f. o. parallel 
and bent backwards; the middle f. o. inserted fairly near the former, nearly meeting in 
centre of head and slightly bent forward ; hind f. 0. bent outwards and backwards, the 
tiny bristle between front and mid o. b. is present ; conv. i. v., div. 0. v., both long ; 
p. v. very minute, inserted well below vertex ; div. oc. inserted between ocelli, but a little 
inside line joining their centres. A few tiny bristles on orange lunular patch and 
on edge of a little triangular piece between the antennal bases, also a small divergent 
pair on ocellar area behind ocelli. Front view:—face shining yellowish, very 
shghtly concave; large 2nd antennal joints quite touching at base, and covered with 
small bristles. Side view (Plate 20, fig. 35):—the 2nd joint is yellow with 3 or 4 
