344 PERCY SLADEN TRUST EXPEDITION 
former extend down to forehead, the first one stout, just opposite the base of front f o. 
Considerably convergent i. v., divergent o. v., inserted rather close together; p. v. just 
below the vertex, crossed at one-third from tip, oc. divergent, inserted midway between 
the end and side ocelli. A few fine bristles on front of frons and on ocellar area. Front 
view :—antenne just not touching at base of large second joints; a well-marked facial 
knob widening below, most prominent just about level of end of third joint ; much concave 
mouth margin: face all orange. Side view (Plate 20, fig. 30) :—second antennal joint yellow 
orange, bristly, with two spines ; third joint orange, sparsely silky, arista with long curved 
rays, five on top, two below, one terminal: inner row well-marked, and somewhat longer 
than usual. Vibrissa, and row of following bristles on orange eye-margins, which form 
the jowls: hind jowls with two or three long bristles: the post.-orb. row longer below 
and behind v. b. Clypeus very evident; palpi and tongue dark orange, the former bristled. 
Thorax. Entirely shining black including the pleurze and scutellum: dorsum very 
sparsely (almost imperceptibly) pollinated and covered with moderately long lines of 
bristles ; scutellum much more densely pollinated. Two d. ¢., the dorsal bristles forming 
six rows of acrostichals; two h., n. p., presut., s. a. bristles, large lower and two smaller 
upper st. pl, scutellar terminal b. crossed just beyond half-way; the equal side bristles 
near base, just divergent. Wings, Fig. 28, very slightly smoky with brown veins: usual costal 
ciliation to between 3 and 4 and then on to 4. 
~— 955) Halters with almost white heads, stalks dark- 
Oe | ened. Legs mostly dusky white, front coxze 
| black, femora darkened except at the tips (in 
| mature specimens), front femora only moderately 

spined behind. 
Abdomen. Shining black, more shining 
3 a than rest on proximal half of the third segment 
Fig. 28. Drosophila triangulifer, n. sp. x40. (except in centre) and on most of the proximal 
part of the next segment except in centre. 
The dorsum with rather long irregularly arranged bristles, longer on the margins. 

Size, a little over 14 mm. ; wing, about 14 mm. 
Localities. Seychelles. Silhouette: Mare aux Cochons, over 1000 feet, IX. 1908. 
Mahé: high forest of Morne Blanc and Pilot, X.—XI. 1908; slopes of Morne Seychellois, 
over 1500 feet, II. 1909; Mare aux Cochons district, 1000—2000 feet, II. 1909; Cascade 
Estate, at or above 800 feet, 1908—9. 
40. Drosophila rufuloventer, n. sp. (Fig. 29 and Plate 20, fig. 31). 
A dark species with black thorax and a dark russet-brown abdomen. 
Head. Eyes densely but shortly pilose. Top view:—vertex and frons entirely 
rather shining intense black, with the large frontal triangle and the eye-margins still more 
shining ; slightly concave behind. Parallel front and hind f. o., the continuing row of 
small bristles to frons evident, the first bristle of these being large and just outside the 
