LAMB— DIPTERA : LONCH^ID^, SAPROMYZID^, EPHYDRID^, ETC. 307 



Sapromyzidse. 

 Pachycerina, Macquart. 

 Pachycerina Macquart, Suite a Buffon, ii. (1835), p. 511. 

 5. Pachycerina seychellensis, n. sp. 

 This species must be closely related to P. javana Macq. 



$. Head (PI. 15, fig. 6). Frons dull yellow orange, paler towards the vertex ; the 

 ocellar spot dull black, nearly circular, but slightly drawn out to the vertex. The two 

 fronto-orbital bristles stand on greyish spots, the spot of the hind one is the larger and 

 is connected to the vertex by a continuing pale greyish line. Face very shining yellow 

 from just above the antennal base to the mouth margin ; it has the usual two roundish black 

 shining spots. Palpi with black heads, the rest yellow. Tongue yellow. 



Two fronto-orbitals, inner and outer verticals, crossed post- verticals, very fine ocellars 

 between the ocelli, and a very fine pair on the vertical black spot just at the vertex. Hind 

 head bristled on the eye-margins below the outer verticals. A fine row of hairs bordering 

 the cheeks and on the jowls. 



Antennae yellow ; the first joint pyriform, second cylindrical, bristled at the apex 

 beneath and at the base on top, third very long and gradually tapering to a blunt end ; 

 arista black with very dense stout feathering. 



Thorax. Dorsum shining, marked longitudinally with brownish and yellowish stripes. 

 Three dorso-central bristles, the last two in the same transverse row as the prescutellar 

 pair of bristles, and two regular rows of achrosticals. The surface has also various 

 scattered hairs ; some of these form well-defined side rows of small bristles, seen best on 

 viewing the thorax sideways ; one such row is a continuation of the dorso-central bristles, 

 another runs roughly parallel to the line of those bristles, but is more remote from the 

 centre line of the dorsum ; this row begins a little before the front dorso-central bristle 

 and ends a little before the third. The yellowish stripes are between the achrostical rows 

 and on the line of the dorso-centrals, and extend to the front of the thorax ; between 

 these three rows are the two brownish stripes. A similar short brownish stripe runs from 

 the intra-humeral bristle to the front of the thorax ; between this and the three post- 

 humeral bristles the humeri and dorsum are again yellow, which colour continues from the 

 side row of bristles over to the hind part of the pleiu'se. 



Pleurae yellow with a broad brown stripe extending from the wing base to the front, 

 a similar narrow stripe on the sterno-pleural suture. 



Scutellum yellow, slightly darkened centrally and at the base, disc somewhat flattened, 

 the usual four strong bristles. 



Wings normal in venation, yellow but slightly darkened along the costal edge ; veins 

 yellow. 



Halters yellow. 



Legs with the usual preapical tibial bristle. Front : femora yellow, brownish on the 

 upper surface with three rows of stout bristles, the underneath row the strongest, tibiae 



