108 PERCY SLADEN TRUST EXPEDITION 



10 (9) Costa barely reaching middle of wing or distinctly short of the middle. 



Costa barely reaching middle of wing (fig. 6), halteres brownish. 



viduata, n. sp. $. 



Costa ending distinctly short of middle of wing (fig. 7), halteres yellow. 



innocens, n. sp. $. 

 Scutellum with only two distinct bristles. 



Subcostal and cubital veins of normal stoutness. 



Halteres brown or black. 



Costa extending far beyond the middle of wing (fig. 8). 



Mesopleura bristly, inner bristles of lower frontal row placed in front of the outer 

 bristles and near the eye margin. extans, n. sp. $^. 



Mesopleura bare, lower frontal row of bristles normal. consueta, n. sp. ^?. 



Costa not reaching middle of wing or only slightly exceeding it. 

 Mesopleura bare. 



Arista short (not longer than the frons), only one pair of supra-antennal bristles, 



yellowish species. brevis, n. sp. ?. 1 



Arista of normal length (longer than frons). 



Posterior tarsi of male with the last joint dilated, fork of cubital vein large, the 

 upper branch being more upright than usual (fig. 9). planipes, n. sp. $%. 



Last joint of posterior tarsi normal, fork of the cubital vein smaller and more 

 acute (fig. 10). 



Frons dull, inner bristles of lower frontal row placed in front of outer bristles and 



near the eye margin. spi^eta, n. sp. $^. 



Frons shining, frontal bristles normal. frontata, n. sp. $. 



Mesopleura bristly, costa ending distinctly short of middle of wing. 



invenusta, n. sp. ^. 



Halteres yellow, mesopleura bare, costa ending distinctly short of middle of 

 wing. media, n. sp. $. 



Subcostal and cubital veins greatly thickened, fork indistinct (fig. 1 1 ), halteres 

 black. latinervis, n. sp. $. 



Costal ciliation long (fig. 12), mesopleura bristly, halteres yellow. 



soluta, n. sp $^. 



5. Aphiochceta aculeipes, n. sp. (Plate 5, fig- 3). 



Yellowish species, cubital vein simple, mesopleura bristly, tarsi pointed and the first 

 three joints of the front tarsi in the female widely dilated and flattened. 



$. Head yellow, ocellar triangle slightly darkened ; fi-ons wider than long, bristles 

 normal, upper pair of supra-antennal bristles stronger and wider apart than lower pair ; 

 antennae yellow, somewhat large, arista more than twice the length of the frons ; palpi 

 yellow. 



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