igij.\ M. Bezzi : Indian Tfypaneids {Fruit- F lies). m 



the collection are three specimens from xlssam, labelled by Bigot: Trypeta ntgricauda, 

 n. sp., and one from Sylhet, June. 



There is in the collection another specimen of this genus, from the L^ushai Hills 

 { M acleod) , which is without the abdomen, and seems to be the true brevicornis (PI. viii, 

 fig. 2i). The pleura is wholly yellow, without black markings; the wing-pattern 

 is as shown in Wulp's figure, the hyaline spot of the third posterior cell being entire. 

 The head and the eyes are not so narrowed as in Wulp's figure, but about as broad 

 as in the following genus. 



8. Rioxa, Walker. 



A group comprising numerous species which have in common the wing-pattern , 

 the shape of the head, the complete chaetotaxy of the thorax and the six bristles of 

 the scutellum. 



Head broader than high; eyes round; face concave, the epistome more or less 

 but distinctly prominent; oc. very minute, sometimes wholly wanting; or. usually 

 2. I, seldom 2. 2.; vt. 2, the inner strongly developed; antennae inserted on the 

 middle of the eyes, short, the third joint rounded at the tip, not more than double 

 the length of the second; arista variable, in some species plumose on both sides, in 

 others pectinate on the upper side only; genal bristle well developed; a row of 

 rather long occipital black bristles ; palpi bristly. 



Thoracic chaetotaxy complete; 2 mpl.; pt. weak. Scutellum flat, with six 

 bristles, the intermediate pair being sometimes smaller. Abdomen elongate, some- 

 times narrowed, bristly on the sides and at the end ; ovipositor flattened, of moderate 

 size. lyCgs in some species short and stout, in others long and slender; front femora 

 with a row of bristles beneath ; middle tibiae with a single rather long spur ; hind 

 tibiae with a complete row of hairs. 



Wings broad or narrow, blackish or brown with hyaline spots and indentations; 

 costal bristle present or wanting; veins straight, the third bristly throughout its 

 length; first vein often very elongate, ending in the middle between the auxiliary 

 and the second vein, but sometimes abbreviated, ending before the small cross- vein; 

 small cross- vein beyond the middle of the discal cell ; posterior cross-vein perpendi- 

 cular; inferior angle of the anal cell drawn out into a long point, longer than the 

 second basal cell, the point broad at the base and sharp at the tip. 



Type. — The type species of Walker was R. lanceolata, a slender form with pecti- 

 nate arista ; the stouter species of the group of vaga with plumose arista are perhaps 

 not congeneric, as also those of the stellata group with Tephritis-like wing-pattern. 



The species in the collection are to be distinguished as follows: — 



1 (i2). All the frontal bristles black ; arista usually plumose. 



2 (ii). Stigma broadly hyaline at the base, the wings therefore with two 



hyaline indentations on the fore border ; arista with many hairs 

 on the under side. 



3 (8). Scutellum with six bristles of about equal size; stouter species, 



with broad wings and a distinct costal bristle; legs stout, short; 

 sides of thorax wholly yellow. 



