° 
368 PERCY SLADEN TRUST EXPEDITION 
Thorax. Ferruginous-ochreous, faintly pollinated with grey, only just perceptibly 
greyer in a narrow central line; covered dorsally with uniform small black bristles; 
between the lines of the d. c. these form six somewhat irregular rows of acrostichal bristles. 
(1+8) d.c., the hind pair not in line with the other, but further apart ; prescutellars ; 
a few small bristles on humeri, n. p., presut., 3 alar. There are also two small bristles 
over the front coxee, one sternopleural, one large and one smaller one above along the side 
of the mesopleural suture, almost in line with last notopleural. Scutellum bare, same colour 
as thorax, flattened on disc, rounded, two basal and two crossed terminal bristles. Wings, 
Fig. 47, slightly yellowish with yellow veins; 1st segment of costa rather bristly, the 
small nick with few bristles, costa attenuating to 4th vein, with similar ciliation all 
along. Halters all orange. Legs all yellow orange: a few longer bristles on front femora, 
terminal spine to mid and last femora. 

Licey en z B BAS eS Se 

Fig. 47. Rhicnoessa ferruginea, n. sp. x 35. 
Abdomen. Darker orange, almost brown-black in many cases, but much lighter on 
the margins; covered with black bristly hairs, which are longer on the margins and sides 
of the segments and very long on margins of the last three segments. 
Size, about 24 mm.; wing, about 13 mm. 
Localities. Seychelles: Mahé; a large series from seaweed on beach, Anonyme 
Island, I. 1909; Long Island, VII. 1908, 1 specimen. Aldabra: 1908—9 (Fryer). 
65. Rhicnoessa aurisetulosa, n. sp. (Fig. 48 and Plate 21, fig. 61). 
This is an almost entirely greyish-yellow species with small eyes. All the bristles 
are golden brown in side light, the macrochetes being a little darker, the small ones quite 
pale. 
Head. The cheetotaxy, is very like the last species, but will be repeated here for 
convenience. Frons pale orange, ocellar area grey inside, pale pollinated grey just round 
it as is the vertex, the narrowish eye-margin, and the paler frontal stripes. 3 f. o. as last, 
the small row on inside eye-margins rather longer than last. I. v., 0. v., p. v. &c¢. much 
as last. Front view :—the antennze quite touch at base, face pale yellow. Side view 
(Plate 21, fig. 61) :—eyes much smaller, antenne all paler, 2nd joint similarly bristled but 
rather more stoutly, arista very slightly slenderer. Jowls similarly bristled, but with 
pale bristles: palpi quite yellow, almost pale, as is the tongue. The true approximating 
