PHILIPPINE DIPTERA, II 41 



Key to the Philippine species of the genus Pterogenia Bigot. 



It seems that this genus, although not yet recorded from these 

 Islands, is represented by a great number of peculiar endemic 

 species; at least I have found in Professor Baker's collection no 

 less than six species, none of which can be referred to any 

 of the twenty-seven oriental species included in Hendel's 

 monograph. 



a 1 . Scutellum entirely black. 



6 1 . Frons as broad as an eye; mesonotum with yellow stripe on each side 



of dorsum, from suture to scutellum; a very robust species of pro- 

 portionally large size, with only banded, not spotted, wings. 



valida sp. nov. 



6 2 . Frons narrower than an eye; mesonotum entirely black or only with 



a notopleural yellow stripe; smaller species, with banded and 

 spotted wings. 



c 1 . Occiput entirely black, even below, or only with a narrow yellow 

 stripe on upper part; mesonotum without a yellow notopleural 



stripe tristis sp. nov. 



c 2 . Occiput with a broad yellow postocular border; mesonotum with 



a yellow notopleural stripe panra sp. nov. 



a 2 . Scutellum margined or striped with yellow, at least on sides. 



d l . Frons broader than an eye; head broader than high; second abdominal 

 segment with a longitudinal keel; legs entirely reddish; wings 

 yellowish, not banded, and with numerous dark spots. 



laticeps sp. nov. 



ef. Frons narrower than an eye; head higher than broad; second abdo- 

 minal segment without keel; legs mainly black; wings distinctly 

 banded. 



e l . Scutellum black, with a narrow yellow hind border; no yellow 

 stripes on dorsum of mesonotum or on sternopleura ; wings dis- 

 tinctly yellow at base luteipennis sp. nov. 



e 2 . Scutellum yellow, with a black central spot; dorsum and sterno- 

 pleura with yellow stripes; wings without yellow at base. 



centralis sp. nov. 

 184. Pterogenia valida sp. nov. 



A stout, short, and broad species, closely allied to the Bornean 

 P. dayak Bigot, but easily distinguished by the black legs, the 

 shortly plumose arista, and the compressed ovipositor. 



Female. Length of body, 8 millimeters; of wing, 8; breadth 

 of body, 4.2. Head greatly developed, rather flat, about as high 

 as broad, black with yellow markings. Occiput rather concave 

 above, glistening black on middle, with a dull deep black border 

 and besides with a complete yellow border, which is narrow 

 distad of the vertical keel and near the upper eye border, but 

 broader on the dilated and produced inferior part. Frons as 

 broad as an eye, somewhat shining black on sides at vertex, 

 opaque brown on the middle band, with a broad yellow border 



