114 PERCY SLADEN TRUST EXPEDITION 



Thorax yellow, scutellum with two strong bristles and two small hairs, pleursR pale 

 yellow, mesopleura bare. 



Abdomen reddish-brown, paler about the second segment. 



Legs pale yellow, first joint of front tarsi equal in length to the next three joints 

 together, cilia to hind tibipe not very distinct, consisting of six to eight bristles. 



Wings with costa hardly reaching middle of wing, subcostal ending nearer to the end 

 of costa than to the humeral cross- vein, costal ciliation sparse, not very long (about same 

 length as in latinervis, fig. 11), fork fairly large, first thin vein evenly curved. Halteres 

 pale brownish. 



Length about 1 mm. 



Locality. Mahd : Cascade Estate, about 800 — 1500 feet. One female. 



14. Aphiochceta planipes, n. sp. (Plate 5, fig- 9)- 



In general appearance much resembling extans and consueta, but distinguished by the 

 venation and the dilated last joint of the posterior tarsi in the male. 



$. Frons brownish -yellow to black, frontal bristles normal, under pair of supra- 

 antennal bristles very small, antennae and palpi yellow. 



Thorax brownish-yellow, pleurae yellow, mesopleura bare, only two scutellar bristles. 



Abdominal markings as in consueta but variable, the dark markings to the fourth 

 segment may be more restricted or even almost absent, but the hind margins of the fourth, 

 fifth and sixth segments ai'e more or less darkened, hypopygium not hidden and with 

 large yellow anal organ. 



Legs pale yellow, inckiding the hind knees, posterior tarsi brownish towards the tip 

 and the last joint of all four tarsi dilated, that of the middle tarsi about twice as long as 

 the preceding joint and nearly twice as wide, that of the hind tarsi about as long as the 

 preceding joint and nearly twice the width, ungues and pulvilli minute. Cilia to hind 

 tibiae moderate, to middle tibiae only present behind the seam. 



Wings (fig. 9) differing from those of extans and consueta in the shorter costa with 

 slightly longer ciliation, in the more open fork (the upper branch being more upright) and 

 in the first thin vein, being more upcurved at the tip. Halteres with yellow stems and 

 yellowish-brown knobs, at least towards the end. 



$ . Costa somewhat longer in proportion to length of wing and abdomen brownish- 

 yellow to blackish-brown, always paler about the base of each segment ; posterior tarsi 

 simple, the last joint only as wide as the preceding joint. 



Length, $ about 1'75 mm., ? often not exceeding 1"5 mm. 



Locality. Silhouette : Mare aux Cochons and forest above. Mahe : high forest of 

 Morne Blanc and Pilot, X.— XL 1908 ; Cascade Estate, about 800—1500 feet. Four 

 males, four females. 



Note. About eight specimens, all except one gummed to card, differ from planipes 

 in having simple tarsi in the male, cubital fork smaller and more acute and thick veins 

 nearer the costa. They must i-epresent a distinct species, but as they do. not present 

 any striking character and are not in good condition I refrain from naming them. 



