LAMB—DIPTERA: HETERONEURIDA, ORTALIDA, TRYPETIDA, SEPSIDA, ETC. 343 
at the vertex; it is dark dull black-brown, merging in front with the rest of the frons, 
which is orange. The ocelli form conspicuous silvery spots on the triangle. Parallel 
front f. 0. ; subparallel hind f. 0. ; the row of bordering bristles starts with the usual large 
one inserted just outside front f. o. and extends to forehead ; long subparallel i.v., diver- 
gent o. v.; p. v. inserted below the vertex and crossed ; oc. inserted between basal and 
front ocellus, somewhat divergent; the ocellar area has some 6 or 8 minute but stout 
bristles on it ; there are two rows of minute pale bristles extending to the forehead along 
the centre lines of the narrow triangles and over the frons. Front view :—antennee just 
separated basally, a central keel which widens but very little extends nearly to the upper 
lip, but does not meet it. The face is orange. Side view (Plate 20, fig. 29):—second 
antennal joint pale yellow, with upper and outer spines and a few small bristles; 3rd 
jot brown, silky; arista pale at base with long feathers, five upper, two lower and 
a terminal: the inner row is represented by only one or two hairs. Stout vibrissa 
followed by usual row of fairly strong bristles ; jowls orange and hind head black. Post- 
orb. row well-marked, three or four behind the v. b. being very stout. Tongue and palpi 
yellow, the latter rather small, slightly thickened at end. 
Thorax. Shining black with rows of small dorsal bristles except behind; these 
bristles are brown in most lights; two d..c.: twos. a. The other bristles cannot be seen 
owing to the method of pinning. Pleurz black, two st. p. Scutellum, black, but polli- 
nated with minute palish pollen: long crossed terminal, long slightly divergent side 
bristles. Wings, Fig. 27, very slightly darkened with brown veins; costal ciliation black 
and strong to before 3 then finer to 4. Halters with 
pure white knobs and slightly yellow stalks. Legs all very 
pale yellow including the coxze: all the bristles weak, and 
but little sign of the femoral rows. 
Abdomen blackish, except for the two basal segments: 
the fourth segment has two very shiny black spaces along — Fig. 27. Drosophila pallipes, 
the proximal margin towards the sides, the last segments HSDs a H: 
are largely shiny. 
Size, just under 15 mm. ; wing, about 1} mm. 
Locality. Seychelles. Mahé: Mare aux Cochons district, 1000—2000 feet, I. 
1909. 
39. Drosophila triangulifer, n. sp. (Fig. 28 and Plate 20, fig. 30). 
This species must be closely related to D. pallipes, but its legs are all darkened. 
Head. Eyes densely pubescent with fine stout hairs. Top view :—the well-marked 
frontal triangle extends about three-fourths down to forehead ; both it and the broad eye- 
margins are shining black and meet on the vertex. The front of frons is orange, and is 
prolonged backwards in two triangular stripes between vertical triangle and eye-margins. 
These narrow uniformly to their ends, and are more brown orange, darkening as 
they narrow. Front f. 0. nearly parallel as are the hind; the small bristles beyond the 
