114 Memoirs of the Indian Museum. [Voiv. Ill, 



Legs longer and more slender than in the preceding ; front femora of the male with a 

 great many black bristles beneath ; front tibiae beneath thickly pilose ; front tibiae 

 of the female with 5 or 6 bristles beneath and the tibiae bare ; hairs of the row of the 

 hind tibiae black. 



The sides of the thorax in this species are not wholly yellow, but above the 

 hmTierus is to be seen a small longitudinal brown streak and another broader one 

 beneath it. 



The species is known from Java. In the collection are some specimens from 

 Sylhet, Assam {Major Hall) June and July, and one from Khargpur, Bengal, 17 — 30- 

 vi-ii [R. Hodgart). 



23. Rioxa soluta, n. sp. c? . 



(PI. ix, fig 26.) 



A small-sized, narrow elongate, slender species, with a hyaline complete cross-band 

 in the middle of the wings. Length 5^ mm. 



A damaged specimen, without head. Thorax shining yellow, with a broad black 

 stripe in the notopleural region ; a small black stripe, parallel with the preceding, on 

 the superior margin of the mesopleura ; all the bristles black, scutellum shining 

 yellow, short, triangular, the intermediate pair of bristles very small. Metanotum 

 shining black : haltères yellow. 



Abdomen very narrow and elongate, dark shining yellow, with yellow pubes- 

 cence and black bristles on the sides; the last segment black at the tip ; genitalia 

 prominent, shining black with yellow base. Legs shining yellow, very long and 

 slender ; front femora with 4-5 long and slender dark yellowish bristles ; front tibiae 

 bare ; hairs of the hind tibiae yellow. 



Wings elongate, the first vein ending at one- third the distance between the 

 auxiliary and second vein ; pattern like that of the preceding, but very well charac- 

 terized by the complete hyaline middle cross-band, which is restricted in the middle 

 just after the small cross- vein ; of the two discal spots of dunlopi the outer only is 

 present, and after this another which is elongate. Before the basal hyaline portion 

 of the stigma are three black spots, and the costal border therefore shows four black 

 spots before the end of the first vein. The point of the anal cell is much shorter 

 than in all the preceding species. 



The general faciès, the pattern of the wings, the weakness of the legs and the 

 brown streaks on the sides of the thorax show affinity with dunlopi. 



A single male from Tenasserim, Lower Burma {W. Doherty) -^-ff-. 



The collection includes a cotype of Trypeta musae, Froggatt, from N. S. Wales ; 

 this is a true Rioxa, and I have placed the species in the above table because its 

 discovery in India is not impossible. R. musae differs from all the above species in 

 having two lower or.; the arista is pectinate, but on the underside are to be seen 

 some very small hairs. Pattern of the wings very like that of dunlopi, but the 

 stigma wholly black; a triangular indentation at the tip of the wings, in the first 

 posterior cell. Anal cell broad, the point broad and a little shorter than the second 



