336 PERCY SLADEN TRUST EXPEDITION 
row on the front femora uniform from base to tip; the last joint of the front tarsi with 
rather unusually well-developed pads and claws, and a few long hairs. 
Abdomen somewhat variable in colour; usually rather blackened with yellowish 
margins at the sides only of segments 2 to 4, 5 with a broader continuous yellow 
proximal margin. The extent of dark and light areas varies a little. There is a large 
hypopygial knob, black and shining above; just beneath it is yellow and pointed, and has 
an opposing yellow appendage springing from a previous ventral segment. 
? The female differs as follows: the third antennal joint is generally much darker, 
the oe. b. are not inserted as in the 2, but outside the line joining ocelli (Plate 20, fig. 20): 
the thorax has a somewhat lighter ground colour, especially in front, so that in one 
or two specimens we may distinguish a darkened middle line between the inner acrostichal 
row and another pair of lighter lines followed by darker ones parallel to them. Some 
specimens were immature. Front feet normal. 
Size, about 1? mm.; wing, 2 mm. 
Localities. Seychelles. Silhouette: Mare aux Cochons, IX. 1908. Mahé: near 
Morne Blanc, X. 1908; Cascade Estate, 800 feet or above, 1908—9. 
32. Drosophila spinipes, n. sp. (Fig. 22 and Plate 20, figs. 22, 23, 24). 
This is a remarkable species represented only by 5 rather imperfect female speci- 
mens; unlike nearly all the known species, these females have specialised characters on 
the front tarsi. The oc. are in front of ocellar area. 

Fig. 22. Drosophila spinipes, n. sp. x 35. 
? Head. Eyes quite bare. Top view (Plate 20, fig. 22):—slightly concave behind; 
behind the front f. 0. b., dull orange, the upper eye-margins more shining, beyond these 
bristles merging to yellow: the ocellar area is not demarcated from the rest of frons, it is 
clothed with bristly hairs, which are exceptionally long: many similar (but shorter) 
small convergent bristles exist on the front part of head beyond front f. 0. The front f. o. 
are parallel, there are two true hind f. o. b., shghtly divergent, with the usual continuing 
row of fine bristles down to the forehead ; these are very well marked and regular. I. v. 
nearly meeting at tips; o. v. much divergent; p. v. nearly meeting at the tips; the oc. 
are quite parallel, and are inserted in front of the front ocellus. All the bristles are 
brown. Front view:—face rather narrow, about twice as high as broad, fairly parallel- 
sided; yellow: the large 2nd antennal joint approximated at base, no true central keel, 
