904 ©. R. Osten Sacken: 
the bifurcation of the second vein (as in Empeda); second submar- 
ginal cell in full contact with the discal, so that there is no anterior 
crossvein and that the first posterior cell is not much longer than 
the second (as in Paratropesa Schin.); anal cell closed; auxiliary 
vein very long, its tip but a very short distance before the tip of the 
first vein. No empodia and no spurs. 
Prof. Westwood’s M. fragillima (tropieal Africa) and the two 
species described by me (MM. tenera from the Philippine Islands, 
and M. pennipes from Borneo, described below) show a perfect ge- 
neric agreement. Among the peculiarities of the venation, the length 
of the auxiliary vein and the proximity of its tip to that of the tip 
of the first vein are specially remarkable. I have shown (l. ec.) the re- 
semblance of the venation of Mongoma to that of Oylindrotoma (?) 
albitarsis Dolesch. IH Bijdr. p. 15, Tab. 4, f. 1, and of Limnobia 
Trentepohlii Wied., p. 551, Tab. 6, b, f. 12 (Sumatra); but whether 
these two species have the auxiliary vein of the same structure re- 
mains uncertain. The resemblance of the venation to that of Para- 
tropesa, Schin. Novara, Tab. 2, f. 2, b (S. Amer.) is merely super- 
ficial; Paratropesa has not the length of legs, nor the light aörial 
structure of Mongoma; it has distinet empodia, which Mongoma 
has not. The absence of empodia induced me (l. e. in the Berl. 
Ent. Z.) to place Mongoma among the Limnobina anomala. But 
the vieinity of Gonomyia is perhaps a better place, on account of 
the shortness of the first submarginal cell, the more so as in some 
Gonomyiae as well as in Lipsothrix the empodia are wanting. 
Mongoma pennipesn. sp. ©. 
Brownish-yellow, thoracie stripes brownish; head, rostrum and 
the base of the antennae pale yellow; flagellum brown; abdomen 
brownish; halteres pale brownish; legs brown, tips of the tibiae 
white; on the middle tibiae the white portion is slightly thickened 
and provided on each side with a short fringe of white hair; tarsi 
white. Wings hyaline; stigma pale; venation as figured by West- 
wood, l. ce. Length about 7 mm. 
Hab. Tumbong Hiong, Borneo. A single male (Berlin Museum). 
Mongoma spec. 
A male and a female from Madagascar (Hildebrandt) in the 
Berlin Museum, may perhaps belong to M. fragillima Westw. They 
are a little larger than Westwood’s measurements; the white of the 
knees („geniculis albis“ Westw.) extends two millimeters on the femur 
and a little more on the tibia; the whole distal third of the tibiae 
