CHRYSOTOXUM. HOI 



orange ; a wide black median stripe and a rather indefinite one 

 on cheeks, behind wliiuh the cheeks are paler yellow. Pi'oboscis 

 dark brown. Occipnt tlnsh with eye-margins except narrowly 

 beliind vertex, yellowish-grey with concolorous pubescence, a 

 yellow fringe on all its margin. TJiorax : dorsum shining black 

 with a slight ieneous tinge, the broad side nuirgins wholly brownish- 

 orange, but distinctly interrupted just behind suture. Pleura) 

 blackish ; lower part with aeneous or deep blue reflections ; meso- 

 pleura with the usual elongated spot brownish-orange, the 

 contiguous one smaller, placed just iu front of root of wing; 

 sternopleura with an orange spot. Scutellum yellowish. Pubes- 

 cence of thorax browuish-yellow, ratlier dense and obvious. 

 Abdomen black ; 2nd and lird segments each with a pair of trans- 

 verse, linear, orange spots forming a slight arc on or just behind 

 anterior margin and not reaching side margins, their inner ends 

 narrowly separated, 2nd pair broader than 1st; 3rd and 4th seg- 

 ments with narrowly brown liind margins, 5tli with a rather large 

 brownish-orange spot in centre. Abdominal pubescence all 

 brownish-orange. Venter black, 2nd segment with a pair of 

 transverse bi'ownish-oraiige spots. Legs brownish-orange to tijis 

 of tarsi ; except fore coxa?, fore femora narrowly at base, middle 

 pair a little more broadly and hind pair nearly to tip, blackish. 

 Wings yellouish-grey, anterior margin rather narrowly yellowish; 

 2nd vein with brownish or yellowish sufl'usion apically ; halteres 

 yellowish. 



Length, 11-12 mm. 



Described from tw o $ $ in the British Museum ; Khasi Hills, 

 Assam. This species is allied to convexum by the orange colour 

 of its pale markings, but the abdominal spots are confined to the 

 2nd and 3rd SHiznients onlv. 



230. Chrysotoxum antiquum, Walk. 



Chnisfito.rum antiquum, Walker, Ins. Sauud., Dipt, i, p. 218 (lcS52). 



(5 5. Head: in c? , oyes clothed with distinct short whitish 

 pubescence, absolutely contiguous for a greater distance than 

 lieight of vertical triangle; latter' black, w itli blackish-brown 

 pubescence. Frons mainly occupied by a shining black triangle 

 with obvious black pubesci-nce ; front edge brownish-orange, sides 

 dusted with yellowish-grey. Face chrome-yellow, with a rather 

 broad median black stripe; a lateral dark brown stripe on cheeks. 

 Antennie wholly Idack. Occiput light grey, a ytdlow fringe nn 

 lower part. In 5 , upper half of frons shining black, the yellow i>li- 

 grey dust-spots large, practically meeting tlie yellow face. Thora.v 

 rather shining black, with rather conspi'iuous brownish-yellow 

 pubescence, which is a little longer than in most species. Two 

 grey dust-stri|)es on anterior margin reaching to about suture; a 

 chrome-yellow spot on humeri, at ends of suture, above base of 

 wing and on hind cornei-s, tlie latter spots practically united to 



