326 The Philippine Journal of Science ma 



parallel, longitudinal black stripes, from the second to the fourth 

 segment; sides of last segment black beneath; genitalia yellow; 

 hairs yellow, but some black bristles on last segment. Legs 

 entirely as in the preceding. Wings with a similar pattern, but 

 the costal area is yellow, not brown, and distinct from the costa, 

 the costal cell with the stigma being hyaline; the gray band on 

 the hind cross-vein is isolated and narrow; there is a small gray 

 spot toward the middle of the anal vein; the apical and sub- 

 apical bands are gray, not brown. 



69. Acanthoneura maculipennis Westw. 



This characteristic and not rare species is represented by a 

 male. 



70. Ptilona brevicornis Wulp. 



Our specimens represent the typical form, very distinct by 

 reason of its reduced chastotaxy. I have seen it also from For- 

 mosa. 



71. Rioxa caeca sp. nov. 



Very near the female of lanceolata (as described by Ender- 

 lein), but distinguished by the want of the apical hyaline spot 

 of the wings. 



Female. — Length of body, 9 mm.; of ovipositor, 2.5 mm. 

 Head with its appendages yellow; all the bristles black; orbital 

 bristles 2 and 3, the first very small. Mesonotum and pleurae 

 light yellow, dark brownish on the back but without distinct 

 color pattern; chaetotaxy complete. The middle pair of lateral 

 bristles on the scutellum only a little weaker than the others. 

 Halteres yellow with brownish knob. Abdomen shining black, 

 the basal yellowish middle stripe very narrow, less distinct, not 

 surpassing the third segment. Legs with the tarsi entirely pale 

 yellowish. Wings with the characteristic black foremargin of 

 R. lanceolata, without any hyaline spot on the stigma and with- 

 out any hyaline indentation ; there are only 2 very small hyaline 

 discal dots, one near the base of the first posterior cell, the other 

 near the apex of the discal cell; 2 larger dots are to be seen in 

 the second posterior cell at the hind margin; a dot on the apex 

 of the third posterior cell, which is hyaline in its greater part 

 as is also the axillary cell. There is also a yellowish, less distinct, 

 spot just over the small cross-vein; the hyaline apical spot be- 

 tween the ends of third and fourth veins is wholly wanting. The 

 second longitudinal vein is a little wavy, but not so much so as 

 in Acanthoneura. 



