334 PERCY SLADEN TRUST EXPEDITION 
hind pair. <A few tiny bristles on ocellar area. Post-orb. row well-developed especially 
behind v. b. Front view :—the face is whitish brown, deeply hollowed, the antennse 
contiguous basally, no central keel. Side view (Plate 20, fig. 19):—the 2nd antennal 
joimt swollen and hairy, bearing a longer dorsal and a front spme; 3rd joint small and 
pubescent, both joints dark brown; the arista dark with six upper, three or four lower, 
one end ray and a sparsely scattered inner row. The black cheeks have a long vibrissa 
at the angle followed by some finer hairs. The post-orb. bristles evident on the black 
hind head, but rather remote from the orbits. Tongue orange. Palpi black, knobbed, with 
bristles. 
Thorax. Dorsum orange with indistinct lines a bit darker along d. c. line, covered 
with sparse bristles. In front where it touches the head it is darker. There are two 
pairs d. c., the first just about the level of the cross suture: h., n. p., twos. a., presut. : 
pleural bristles destroyed by pin. Scutellum orange in mid line with two large black 
spots on sides up from base: these bear basally two long bristles, and on their extreme 
tips are the crossed terminal pair. 
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Fig. 20. Drosophila punctiscutata, n. sp. x 50. 
Wings as Fig. 20; glassy with orange veins; costa well-marked to the end of 8 
with fine black ciliation, less marked to 4 with paler ciliation. Halters with rather 
elongate orange heads and darker stalks. Legs entirely yellow, 2 or 3 longer ‘bristles 
distally and behind on the front femora. 
“Abdomen. Entirely shining black except for the orange ovipositor and the centre 
line of the belly, bristled discally with longer marginal bristles. 
Size, about 2 mm. ; wing, about 13 mm. 
Locality. Seychelles. Mahé: Mare aux Cochons district, 1000—2000 feet. I. 
1909. 
31. Drosophila aberrans, n. sp. (Fig. 21 and Plate 20, figs. 20, 21). 
This species is aberrant in general facies; the eyes are very oblique, and project 
backwards behind the vertex: the oc. b. are inserted well outside the ocellar area. 
¢ Head. Eyes strongly pubescent, red. Top view (Plate 20, fig. 20) :—frons 
mainly orange, eye-margins slightly greyish yellow, a fine silvery border to the eyes can 
be seen in some lights extending forward from the hind f. 0. The actual vertex, as well 
as the back of head, are like the eye-margins. The area surrounding the ocelli down to 
the oc. b. is blackened. The rest of the frons is (as stated above) orange, fairly shining, 
