332 PERCY SLADEN TRUST EXPEDITION 
and tarsi, a moderately developed lower front femoral row of bristles, stout terminal spine 
on the middle tibia. 
Abdomen. Black, m dorsal view the following spots can be seen: on the second 
segment, two indistinct silvery patches at the upper angles, which are rather bristly on 
the sides; 4, 5, and 6 have each two pale silvery spots, transversely elongate, with the 
front border coincident with the proximal margin, the curved lower boundaries extending 
to about one-third the segmental breadth ; the spot on the 6th extends more over the side — 
margins, and that segment is more greyish black than the others. AIl the segments 
except Ist are bristled dorsally and marginally, the latter bristles being the longer. In 
side view two inferior silvery spots can be seen on edges of 2nd just below the upper 
angles and two inferior round silvery patches on 3rd (which is immaculate above), these are 
nearly as big im diameter as the segment’s breadth. A further silvery patch can be 
glimpsed on the belly of the 4th segment. 

Fig. 18. Drosophila nigerrima, n. sp. x 30. 
Size, 3 mm.; wing, 3 mm. 
Locality. Seychelles. Mahé: a single specimen, Cascade Estate, at or above 
800 feet, 1908—9. 
29. Drosophila nigrobrunnea, n. sp. (Fig. 19 and Plate 19, fig. 18). 
This is the 3rd species with a well-marked costal slit and swelling. 
There are but three specimens, one headless, and one gummed which has conse- 
quently lost its proper colouring. 
Head. Eyes bare. Top view :—frons dull brown-black behind merging into dull 
orange over the forehead ; ocellar area slightly shining; eye-margins very shining dark 
brown (there is a slight silvery sheen on the frons in side view). The eyes project 
much backward, so that the hind margin is very concave. Parallel forward pointing f. o., 
slightly divergent hind f. o.; the continuing row of bristles from the latter is absent, 
except for the Ist small bristle between the two f. o. ; strongly convergent 1. v., smaller 
straight and divergent o. v.; p. v. behind the vextex, crossed about two-thirds from 
the tip; rather long divergent oc., inserted between back and front ocelli. Front 
view :—face dullish grey-orange ; antennze with the large 2nd joints touching at the base; 
a very well-marked keel between the 3rd joints, which widens gradually till it meets the 
rather swollen upper lip, being demarcated therefrom merely by a sulcus: two deep 
antennal foveee are thus formed. Clypeus evident; darker. Side view (Plate 19, 
fig. 18) :—the head bristles seem rather more adpressed than usual ; 2nd joint of antenne 
