364 PERCY SLADEN TRUST EXPEDITION 
reddened at the base, though sometimes more extensively so. The long tip of tongue is 
ochreous. 
Thorax. The ground colour is black, but in good specimens it is densely covered 
with a fine close granular ochreous-yellow pollination, which is best developed on the hind 
part of the thorax and on the bare scutellum : this is demarcated from the thorax by an 
extremely shallow line which is greyer. The dorsum (except the basal part) is uniformly 
clothed with short black bristly hairs. Last two pairs of d. c, the hind pair largest, 
prescut., two h., n. p., presut., three small bristles above wing, a very long one on post- 
alar callus, with a shorter one inside it. No distinct pleural bristle except a stout sternopl. 
over middle coxze. Scutellum with two basal and two long apical bristles crossed at the 
tips. Wings, Fig. 43, glassy with pale, almost white, veins. Costal bristles long at 
the base, bristly as usual on first segment with two spines at nick: black bristles as far 
as second vein, the thickening extending, but attenuating, to the fourth. Halters clear 
yellow, the stalks slightly darkened. Legs brownish black, middle and hind tarsi tawny 
orange, knees narrowly the same. 

Fig. 43. Desmometopa mauratum, n.sp. x 30. 
Abdomen. Black, slightly shining, covered with bristly hairs, the submarginal row 
being the longer, and especially so on the last segment, which is obtusely pointed, longer 
than the preceding one, which is again longer than the next. 
Size, 2mm.; fa little smaller; wing, 2 mm. 
Localities, Seychelles. Silhouette: Mare aux Cochons, over 1000 feet, from vege- 
tation on the plateau, VIII.—IX. 1908. Mahé: Cascade Estate, at or above 800 feet, 
1908—9 ; marshes on coastal plain, Anse aux Pins and Anse Royale, I. 1909. 
In addition to the above species, which are represented by a fair number of indi- 
viduals, there are two- more, one with but two specimens, the other unique: all are 
unfortunately in rather bad condition, but the species are so marked in character that 
short descriptions can be given. 
61. Desmometopa microps, n. sp. (Fig. 44 and Plate 21, fig. 57). 
There are two specimens, both rather damaged. 
