298 THEREVIDJE. 



Tibiae brownish yellow. 



Posterior margins of abdominal seg- 

 ments narrowly and uniformly 

 yellow jlauolineata, Brim., p. 299. 



Posterior margins of abdominal seg- 

 ments ash-grey, much broader 

 towards sides bilineata, Bruu., p. 300. 



Four other species are probably from India, but require con- 

 firmation. 



233. Thereva kempi, sp. nov. 



<5 . Head with eyes contiguous for about one-third of the distance 

 from vertex to antennae, with a dull greenish tinge ; vertex 

 yellow-dusted, with a few black hairs ; ocelli shining black ; frons 

 yellow-dusted, rather closely punctured, with long black bristly 

 hairs on upper part, continuing down the sides as far as level of 

 antennae ; rest of frons and whole of face and cheeks covered with 

 dense bright chrome-yellow bristly hairs. Antennae orange ; 

 upper part of 3rd joint, except at base, blackish, as is also the 

 style ; 1st joint with conspicuous long black bristles ; 2nd with 

 an incomplete circular band of smaller black spines ; 3rd with a 

 little whitish pubescence and a few small bristles at base above. 

 Proboscis orange ; occiput yellowish, on upper half with short 

 yellow pubescence and a row of strong black bristles along upper 

 margin ; lower part behind eyes whitish, with long black hairs. 

 Thorax black, covered with rather dull yellow tomentum and, at 

 least towards sides of dorsum, with short bright yellow somewhat 

 coarse pubescence ; the whole dorsum covered with long fine black 

 hairs, whicli are densest in the centre. Scutellum yellow-dusted, 

 darker in centre and at base, with yellow pubescence with a con- 

 siderable number of long black hairs intermixed ; hind margin 

 with four long bristles. Pleurae light grey, closely covered with 

 bright yellow pubescence, which is mainly replaced on the sterno- 

 pleura by white hairs. Abdomen with 1st segment dark grey, with 

 sparse soft black hairs ; rest of segments deep black, more or less 

 shining at base, with a well-marked bright golden-yellow hind 

 margin to each, the colour extending forwards towards the sides 

 as far as the middle of each segment or beyond ; whole dorsum 

 covered with dense black or yellow pubescence according to the 

 ground-colour. Venter light grey, appearing darker in certain 

 lights, with distinct pale yellowish-white hind margins to 

 segments ; the whole surface with sparse soft bright yellow hairs. 

 Legs : coxae light grey, with rather long yellow pubescence ; 

 femora black, anterior pairs with similar pubescence ; hind pair 

 nearly bare, but with a row of seven or eight black bristles below; 

 tibiae brownish yellow, blackish at tips, with the usual bristles 

 and microscopic pubescence; tarsi dirty brownish yellow, tip of 

 1st joint, apical third of 2nd, base of 3rd and 4th narrowly, and 

 all 5th black. Winrjs pale grey, highly iridescent ; 4th posterior 

 cell closed slightly before the border ; stigma dark brown ; halteres 

 blackish. 



Length, 12 mm. 



