304 PERCY SLADEN TRUST EXPEDITION 



at the base, then black ; it is very beautifully feathered, each ray being shaped like an 

 elongated S: there are about 18 rays each side. Palpi stout, fleshy, black and hairy, 

 somewhat compressed sideways. 



One pair of fronto-orbital bristles, two pairs of verticals, the outer much weaker than 

 the inner, a fine pair of forwardly-directed divergent post-verticals, stout oceUars : in profile 

 the frons is seen to be finely haired all over. 



Thorax. Dorsum clothed with adpressed hairs, but the hind part is bare. Scutellum 

 duller and greyish in colour. Bristles normal. 



Wings (Fig. 1) pellucid with yellow veins, the fine costal clliation black. Calypters 

 small, whitish yellow, pale-margined and white-haii'ed. 



Halters black with paler stalks. 



Legs. Front : femora with two rows of long bristly hairs ; tibise and tarsi clothed 

 with short bristly hairs. Middle : femora all covered with short bristly hairs, an inferior 

 posterior row of longer ones is conspicuous ; tibiae with similar fine bristles and a terminal 

 crown of spines ; tarsi with black bristly hairs. Hind : covered with fine bristly hairs, 

 among which is a somewhat conspicuous row below the femora. 



Fig. 1. Lonchaca plumaia, n. sp., wing. 



Abdomen, t- The last segment is slightly longer than the two previous ones 

 together (PL 15, fig. 2) and has the form of a truncate triangle with the end notched. 

 The two angular tips thus formed bear a bunch of black bristly hairs. The whole surface 

 dorsal and ventral is covered with similar hairs which are stouter on the mai'gins of the 

 segments and towards the end of the last segment. 



% like the male, except as follows : — Face about one-third as wide again as that of the 

 male ; abdomen with equal segments except the one before the ovipositor, which is a little 

 narrower ; the ovipositor is shining black, acicular, scarcely flattened, the sheath is paler. 



Size about 4 mm. 



Localities. Seychelles. Silhouette: Mare aux Cochons, over 1000 ft., IX. 1908. 

 Mah6: Port Victoria, XII. 1908; Long Island, VIL 1908; Anonyme Island, L 1909; 

 marshy ground near sea-level at Cascade, 20. II. 1909 ; cultivated country about 1000 ft., 

 XL— XII. 1908 ; near Morne Blanc, about 800 ft., X.— XL 1908 ; Cascade Estate, 

 800—1700 ft. and over, 1908—9 ; forest behind Trois Freres, about 2000 ft., 14. I. 1909 ; 

 Mare aux Cochons district, about 1500 ft., I. — II. 1909. 



3. LonchcBa longicornis, n. sp. 



A shining bluish-black species with red metatarsi, j^ale calypters with pale hairs. 



