COLLIN— DIPTERA, PHORID^ FROM SEYCHELLES 117 



beneath the outer and near the eye margin, supra-antennal bristles almost equally large, 

 upper pair wider apart than the lower, antennae very small, brownish-black, palpi yellow. 



Thorax brownish-black with a tendency to red, scutellum with only two strong 

 bristles, pleurae the colour of the thorax, mesopleura bristly. 



Abdomen dull black, hind margin of the sixth segment and the somewhat hidden 

 hypopygium grey, anal organ short and grey. 



Legs yellow, hind legs somewhat dusky, front tarsi stout, cilia on hind tibiae 

 inconspicuous. 



Wings (fig. 11) with the costa and second thick vein remarkably thickened and the 

 fork very indistinct. Halteres brownish -black. 



Length about 1 mm. 



Locality. Mahe : Anonyme Island, from grass, or ferns, or trees, I. 1909. One 

 male. 



20. AphiochcBta soluta, n. sp. (Plate 5, fig. 12). 



Frons black, somewhat shining, longer than broad, inner bristles of lower frontal row 

 placed almost immediately beneath the outer ones and close to the eye margin, upper pair 

 of supra-antennal bristles placed wider apart than the almost equally large lower pair, 

 antennae small, brownish-black, palpi dusky yellow. 



Thorax with a tendency to red, scutellum with only one pair of bristles, pleurae 

 brownish-yellow, mesopleura with a number of fine bristles and 1 — 2 stronger ones. 



Abdomen black with a greyish gloss in some lights, hypopygium small, not very 

 prominent, anal organ stout, dusky yellow. 



Legs yellow with hind knees darkened, cilia to hind tibiae distinct, about 8 — 10 in 

 number, hind femora with a ciliation of about 7 long curved hairs at base beneath, front 

 tibiae somewhat thickened. 



Wings (fig. 12) with long costal ciliation and narrow fork, first thin vein very evenly 

 curved. Halteres yellow. 



Length from 1"5 mm. $, to 2 mm. $. 



Locality, Silhouette : forest above Mare aux Cochons, 2. IX. 1908. Mahe : Cascade 

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

 Mare aux Cochons district, about 1500 feet, 2G. I.— 2. II. 1909 ; scrubby forest vegetation, 

 top of Mount Sebert, 1800 feet or more, I. 1909. Four males, twelve females. 



Note 1. Two males from Mahe, Cascade Estate, about 800 feet and over are very 

 much like soluta but the lower row of frontal bristles are normally arranged, the meso- 

 pleura bears one strong bristle standing out distinct from the other minute bristles, the 

 hind femora at the base beneath bear a closely-set cilia of short curved hairs in the place 

 of the seven long curved hairs of soluta $. The hind margins of the abdominal segments 

 are narrowly yellowish. It is probably a distinct species. 



Note 2. There is probably yet another species near soluta in the collection, but 

 I refrain from naming it because the British species have taught me that this group is 

 a very difiicult one and requires further study based upon long series. 



