36 PHILIPPINE DIPTERA, II 



from Sulu Island from a unique mutilated specimen in the 

 British Museum. 



Length of body, 9.2 millimeters. Antennae shorter than the 

 face and entirely yellow. Abdomen very like that of Stenop- 

 terina, shining bluish green, white-pubescent, with two or three 

 long, bristly black hairs on middle of the sides of first segment. 

 Front coxse reddish, like the fourth anterior femora; all the 

 tibia? and the tarsi dull black ; hind femora shining bluish green. 



176. Pseudepicausta chalybea Dol. 1858. 



Dapitan, Mindanao, and Puerto Princesa, Palawan. Widely 

 spread over the Malay Archipelago to New Guinea and already re- 

 corded from the Philippines as a Stenopterina by Osten Sacken. 



177. Scotinosoma typicum sp. nov. 



Hendel has revised this Loewian genus, which had been with- 

 out a type, for an Australian species. But in the present col- 

 lection there is a small fly which seems much better to agree 

 with Loew's conception, being almost a Rivellia without sinuosity 

 of the second section of the fourth longitudinal vein and with 

 a very narrow marginal cell. The pattern of wings is the same 

 as described by Loew ; but it must be recorded that in the Oriental 

 Region there are some species of true Rivellia, like costalis 

 Hendel, which show an analogous pattern on wings. 



Female. Length of body, 3 millimeters; of wing, 3. Head 

 entirely black, only the broad frontal stripes being dark reddish 

 brown in middle and in front ; f rons narrower than an eye, with 

 parallel sides or only a little narrowed near the antennae ; lunula 

 deep black ; antennae free, inserted at the middle of eyes, shaped 

 as in Rivellia, as long as the face, the third joint becoming 

 gradually attenuated, with a basal, microscopically pubescent 

 arista. Praelabrum greatly developed, but retracted, shining 

 black; palpi and proboscis black. Bristles of head black, two 

 pairs of frontoorbitals directed backward, ocellar short, post- 

 vertical small, two pairs of strong and long verticals, the inner 

 pair converging; frontal hairs scattered. 



Mesonotum longer than broad, little convex, entirely of a 

 rather shining greenish color, more black on the pleurae; the 

 short hairs along the dorsocentral lines black and extended to 

 the fore border; macrochaetae black, one humeral, two notopleu- 

 rals, three supra-alars, one dorsocentral, but I cannot perceive 

 a trace of mesopleural. Scutellum colored like the dorsum of 

 mesonotum, bare, with four long black marginal bristles. 

 Mesophragma shining black, with faint metallic reflections. 

 Squamae small, white ; halteres yellowish. 



