138 Memoirs of the Indian Museum. [Voi,. Ill, 



Head as high as broad, the eyes a little narrowed ; face a little concave ; antennae 

 placed on the middle of the eyes, the third joint 2^ times as long as the second, round- 

 ed at the tip ; arista plumose, the hairs scarce and scattered, those on the upper side 

 a little longer ; palpi with bristles ; no oc. ; or. 2. 3, the superiors very thick ; vt. 2 ; 

 pvt. weak ; occipital row yellow ; genal bristle strong. 



Thorax with complete chaetotaxy; pt. weak. Scutellum rounded, convex, with 4 

 bristles. Abdomen elongated, bristly on the sides and at the end ; ovipositor flattened, 

 as long as the abdomen. Legs robust, middle tibiae with a single spur. 



Wings long, with a distinct costal bristle ; first longitudinal vein short ; second 

 wavy at the base, straight at the end; third bristly, its last portion very much curved 

 forwards towards the middle ; small cross-vein placed on the middle of the discal cell ; 

 posterior cross-vein a little oblique ; second basal cell twice as broad as the first ; 

 inferior angle of the anal cell drawn out into a narrow point, longer than the second 

 basal cell. Pattern of the wings very peculiar, consisting of three longitudinal yellow 

 rays, diverging from the base. 



Type : the following new species. 



This genus is a very peculiar one, but seems to be related to the European yellow 

 species of Acidia. The American genus Plagiotoma has nothing to do with the present 

 genus, notwithstanding the rather similar pattern of the wing. Allied to the present 

 genus seems to be the African species which I^oew has described as Trypeta jucunda 

 in 1 86 1 ; and I have in my collection an undescribed species from Central Africa, 

 which is allied with that here described, but not congeneric. The genus Chelyophora, 

 Rondani, placed in the Ortalids by Wulp, is perhaps allied, but has a very different 

 pattern of wing. 



43. Xanthorrachis annandalei, n. sp. 2 . 

 (PL ix, fig. 43). 



A yellow handsome species of great size, with 6 black dots on the thorax and 

 scutellum, yellow bristles and 3 yellow rays on the wings. I^ength 7 mm., without the 

 ovipositor which measures 4 mm. 



Head wholly yellow, shining ; antennae yellow, the third joint darkened at 

 the tip ; arista yellow ; proboscis and palpi yellow, these last with short yellow 

 bristles ; a small black ocellar dot ; all the bristles yellow ; on the lower portion of 

 the occiput some yellow hairs ; the second superior or. is very thick and inserted 

 on a small tubercle. 



Thorax shining, wholly yellow, with all the bristles yellow ; a black dot on the 

 post-alar calli ; metanotum yellow ; scutellum light yellow, with four black dots, on 

 which are inserted the 4 yellow bristles. Squamulae and haltères yellow. Abdomen 

 wholly yellow, with yellow pubescence, but black bristles ; ovipositor reddish yellow, 

 shining. I,egs wholly yellow and with yellow bristles, those of the front femora being 

 6-7 in number ; the tibial spurs black. 



Wings hyaline, with yellow veins. The three yellow rays are disposed as follows : 

 the first extends along the costa, filling out the costal, marginal and submarginal 

 cells ; this ray is united at the base with the second, from which it is separated by a 



