16 PHILIPPINE DIPTERA, II 



121. Libnotes opaca sp. nov. 



Entirely opaque orange-yellow, with the genitalia dark brown ; 

 wings hyaline, with a pale yellowish tint. 



Male. Length of body, 10.5 millimeters; of wing, 13. Head 

 entirely yellow, with the rostrum brownish; palpi black; anten- 

 nae black, the scape and the first joint of flagellum somewhat 

 yellowish. Thorax and scutellum uniform bright orange, entirely 

 opaque, destitute of any black or brown marking. Halteres 

 yellow, with brown knob. Abdomen colored like the thorax, 

 even on venter ; forceps brown, with the underplate dark yellow. 

 Legs wanting in the type ; coxae and trocanters bright orange. 



Wings with only a light yellowish tinge, with an elongated, 

 less distinct, stigmatic grayish spot and the extreme tip a little 

 darkened. Marginal cross vein prolonged, seemingly a continua- 

 tion of the first longitudinal vein ; discoidal cell much narrower 

 at base than at end, hind cross vein placed on its middle ; second 

 and third posterior cells of the same length. 



LUZON, Laguna, Mount Maquiling (Baker). 



The present species is closely allied to L. familiaris Osten 

 Sacken, differing in the prolonged marginal cross vein and in 

 the opaque, unstriped thorax. Allied also to L. rufa de Meijere, 

 but distinguished by the wings not being inf uscated and by the 

 base of the third vein not being margined with fuscous. 



122. Libnotes marginalia sp. nov. 



Very near L. opaca, but of greater size and distinguished by 

 the wings being yellowish and bordered with black at tips. 



Male. Length of body, 11.5 millimeters ; of wing, 14.5. Head 

 and rostrum yellow ; palpi and antenna? as in L. opaca. Thorax, 

 scutellum, halteres, and abdomen as in L. opaca. Genitalia 

 with yellow, not brown, forceps. Legs wanting in the type. 

 Wings with a strong yellowish tinge and a broad black border, 

 extended from end of first vein to the base of fourth posterior 

 cell; marginal cross vein elongated; discal cell a little shorter 

 than in L. opaca; third posterior cell at base longer than the 

 second, the veins, therefore, not on the same line as in opaca and 

 exactly the opposite of the condition in familiaris. 



LUZON, Laguna, Mount Maquiling (Baker) . 



123. Libnotes termitina O. S. 1882. 



One male from Mount Maquiling. Endemic. 



124. Geranomyia argentifera de Meij. 1911. 



One female from Mount Maquiling. Know only from Java; 

 a very distinct species on account of the hyaline wings and the 

 silvery patches on frons and thorax. 



