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



305 



$. Head (PI. 15, fig- 3). Vertex and frons somewhat shining and sHghtly hairy ; 

 eye-margins smoother and more shining, especially from the vertex to the fronto-orbital 

 bristles : the front part of the frons and the lower part of frontal eye-margins dull. The 

 upper part of the eye-margins narrows considerably from the vertex to the fronto-orbital 

 bristles. A silvery spot lies between the bases of the antennae. Face with silvery dust 

 and a well-marked narrow central linear keel ; the face widens rapidly from the antennse 

 to the mouth. Antennae close to eyes, so that in front view the antennae are markedly 

 divergent. Eyes bare. 



Antennae black with the third joint somewhat dusted inside, it is very long and 

 nearly parallel-sided, with an evenly-rounded tip extending in side view well below the 

 mouth margin ; arista long, and microscopically pubescent, brownish at the base, the rest 

 black. 



One fronto-orbital bristle, fine post-verticals, long ocellars ; frons fine-haired in profile. 



Palpi fleshy, black and hairy. 



Thorax. Dorsum bristly-haired, both it and the pleurae are shining black with 

 a distinct blue tinge. Scutellum also shining black but with a faint greenish tinge. 

 Bristles normal. 



Wings normal : venation much as the last species, but with the lower cross-vein 

 slightly more oblique ; brownish in colour, with yellow-brown veins. 



Calypters pale with pale borders and hairs. , 



Halters all black. 



Legs black except that all the tarsi are reddish-yellow. Front : femora with the 

 usual two rows of bristles with some irregular and shoi'ter bristles between ; the upper 

 backwardly-directed row is regular, the lower downwardly-directed row has five or six 

 bristles which are not so long as usual. Middle : femora with a regular row of strong 

 hairs below ; tibige with only one stout inner bristle of the terminal crown evident. All 

 the legs covered with fine bristly hairs. 



Abdomen. Ovate in outline with nearly equal segments and a bluntly-pointed tip. 

 From a top view it is seen to be bordered with long fine black bristles ; the outer corners 

 of the second segment with abundant black hairs ; dorsum with longish bristly hairs but 

 no very evident marginal bristles. 



$. Frons wider than in male, nearly parallel-sided. Ovipositor long black non- 

 flattened with a black sheath ; when fully extended it is nearly as long as the rest of the 

 abdomen. 



Size about 3 mm. 



Locality. Seychelles. Mah^ : Cascade Estate, about 1000 ft., 1908 — 9. 



4. LonchcBa vihrissifer, n. sp. 



A black species witli yellow metatarsi, calypters pale and pale-haired, and with very 

 long vibrissas. 



39—2 



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