AUSTRO-MALAYAN DIPTERA 403 



diminishing in breadth ; last joint long and slender ; front and 

 vertex brownish-gray, with some blackish pile. Thoracic dorsum 

 brownish-yellow , opaque , without apparent stripes ; pleurae 

 nearly of the same color, faintly shining and almost imperce- 

 ptibly pruinose ; scutellum and metathorax yellowish ; the latter 

 with some faint brown shadows ; abdomen almost uniformly 

 brownish-yellow, with a brownish dorsal stripe ; genitals purer 

 yellow. Legs : only a single hind femur is extant , which is 

 yellow. Wings yellowish-hyaline, veins pale brown, those along 

 the costa more yellow; the tip of the auxiliary vein is a little 

 beyond the middle of the inner marginal cell ; the crossvein 

 close by this tip ; the end of the first longitudinal vein is in- 

 curved towards the second and connected with the costa by a 

 crossvein a little distance before its tip ; stigma none ; the obh- 

 que praefurca is about 1 74 the length of the discal cell ; great 

 crossvein opposite the middle of the discal cell ; the latter in 

 the shape of a truncate triangle, the second and third posterior 

 cells, which form its base, being of the same length ; seventh 

 vein strongly arcuated. 



Hah. Ternate, (Beccaria 1875). A single male. 



Libnoies poeciloptera n. sp. c/' 9 . Brownish-yellow, thorax with 

 four brown stripes ; wings with numerous brown spots, placed 

 along the veins. Length : 10-12 mm. 



Rostrum and palpi brownish ; front reddish. Antennae brow- 

 nish-yellow ; first joint of scapus brown ; joints of the flagellum 

 of nearly equal length , but gradually diminishing in breadth ; 

 thus, nearer the base they are as broad as long , nearly roun- 

 ded, but gradually become more slender and cylindrical ; a ru- 

 dimental IB*"" joint at tip ; besides a microscopic pubescence , 

 perceptible only under a strong lens , only a few longer hairs 

 are visible, and they are not longer than the joints themselves. 

 (The antennae of the 9 are damaged at the tip). Thoracic dor- 

 sum brownish-yellow, intermediate brown stripes approximate; 

 lateral ones abbreviated. Scutellum yellow, metathorax brownish. 

 Abdomen, including the genitals, reddish-yellow. Halteres yellow 



