LAMB— DIPTERA : LONCH^ID^, SAPROMYZID^, EPHYDRID^, ETC. 335 



<?, ?. Head (PI. 16, fig- 9). Yellow with a small black ocellar dot ; frontal triangle 

 pale shining yellow with its base nearly reaching from eye to eye and its point extending 

 very nearly to the antennae ; face, palpi and tongue yellow. Eyes slightly pubescent. 

 Fronto-orbital bristles (1 + 3), outer and inner verticals the former divergent, crossed post- 

 verticals, strongly crossed ocellars, a row of fine inwardly convergent bristles parallel to 

 but slightly removed from the sides of the frontal triangle. Antennae pale with a large 

 third joint, a brown pubescent arista, and a strong bristle on the top edge of the second 

 joint. 



Tongue yellow : in the male it possesses a pair of long fine pale setae as shown in 

 fig:. 9, the female is devoid of these setoe. 



Palpi yellow. 



Thorax. Dorsum yellowish red : in some cases a pair of brownish red lines run 

 from the last pair of dorso-central bristles (the only pair present) to just behind the 

 humeral calli ; these lines vary in intensity in different specimens. The dorsum is covered 

 with pale hairs. Pleura pale yellow ; when the insect is viewed perpendicular to its 

 dorsal plane the pleural bristles stand out as long though fine. Scutellum flattened, pale 

 yellow, covered with hairs ; four scutellar bristles the end ones long and crossed at the 

 tip. 



Wings as Fig. 21 ; veins pale. 



Halters yellow. 



Legs all pale yellow. The hind pair are long and the terminal tibial spur is very 

 black and long, being nearly equal in length to the metatarsus. 



Abdomen yellow. 



Size. 2^ mm. 



Localities. Seychelles. Mahe : Cascade Estate, about 1000 ft., 1908 — 9; Anonyme 

 Island, I. 1909. Amirantes : Eagle Island, 17. X. 1905. Cargados Islands : Establishment 

 Island, 28. VIII. 1905. 



41. Hippelates nigrescens, n. sp. 



This species is similar to the last in form, venation, etc. ; it differs as follows : 



All the bristles are black. 



Head. Blackish brown, yellow just above the antennae. Antennae nearly bhick. 

 Lower eye-margins silvery. Frontal triangle black and shining, i-eaching to about 

 two-thirds way down to the antennae. Eyes very hairy. Tongue devoid of setae in the 

 male. 



Thorax with dorsum dark brown, the scutellum yellow. Wings with pale veins. 

 Legs similar to last species but slightly stouter, also with large tibial spurs. 



Abdomen black. 

 Size. 2^ mm. 



Locality. Seychelles. Mahe : scrubby forest vegetation on summit of Mount Sebert, 

 1800 ft. or more, I. 1909. 



SECOND SERIES— ZOOLOGY, VOL. XV. 43 



