342 PERCY SLADEN TRUST EXPEDITION 



or two-thirds, tibipe and tarsi yellow; hind legs, coxse black, femora slightly infuscate, 

 tibiae with an infuscate ring, tarsi yellow. In some specimens the infuscation is con- 

 fined to the ring on the hind tibise, and more rarely the legs are entirely yellow. 



Abdomen. Shining black, sometimes paler at the base; venter pale. 



Size. If to 2 mm. 



Localities. Seychelles. Silhouette: high forest, 2000 ft.; near Mont Pot-a-eau, 

 about 1500 ft., VIII. 1908; Mare aux Cochons plateau and forest above, VIII.— IX. 1908; 

 low coconut-planted country near coast, Pointe Etienne, 17. IX. 1908. Mahd: near 

 Morne Blanc, about 800 ft., X.— XI. 1908; high forest of Morne Blanc and Pilot, X.— XI. 

 1908; Cascade Estate, about 1000 ft., and forest above up to 2000 ft., 1908—9; Mare 

 aux Cochons district, 1500—2000 ft., I.— II. 1909; Morne Seychellois, over 1500 ft., 

 4. II. 1909. Praslin: Cotes d'Or Estate, X. 1908. 



49. Oscinis longipennis, n. sp. 



This species is like the European O. atricornis Zett. 



Fig. 28. Oscinis longipennis, n. sp., wing. 



$, ?. Head (PI. 16, figs. 14, 15). Frons dull rufous black with a very shining 

 frontal triangle which is less broad at the base than in the last species (PL 16, fig. 13) 

 and has a somewhat pointed apex which does not quite reach the antennse. Five fronto- 

 orbital bristles, two verticals each side, crossed post- verticals, convergent ocellars; the 

 frontal triangle with well marked bordering bristles. Face in profile more retreating 

 than in last species (fig. 23), with a long pit-like furrow in the centre which is yellowish at 

 the bottom. Mouth margin shining black with bordering bristles, the upper pair of which 

 are longer and form vibrissse. Hind head shining black, lower eye-margins dull. Tongue 

 and palpi blackish. 



Eyes microscopically pubescent. 



Antennse black, third joint orbicular, arista black and pubescent, second joint slightly 

 paler. 



Thorax and scutellum as the last species. 



Wings as Fig. 28 : the second vein is straight almost to the end where it suddenly 

 turns up to the costa; the third and fourth veins slightly and continuously divergent. 

 The wings are exceptionally long and ample and extend far beyond the tip of the 

 body: they are slightly suffused with brown and have brown veins. 



Halters yellow. 



Legs entirely yellow except the middle and hind coxse and occasionally a slight 

 infuscation on the hind tibise. 



I 



