64 SYEPHIB^. 



moderately dense, rather fine bright yellow pubescence, but hind 

 border ot" scutellum with black hairs. Abdomen orange-yellow ; 

 1st segment with moderately broad median stripe and hind border 

 narrowly black, the colour slightly broader in middle ; sometimes 

 the segment nearly or wholly yellow ; 2nd segment with narrow 

 median black stripe present, indefinite or absent ; hind margin 

 shining black ; 3rd and 4th segments similar, but median stripe 

 absent and occasionally extreme anterior margin black; 5th segment 

 with black hind margin indefinite or absent, occasionally quite 

 distinct. Extreme sides of 1 st and basal half of 2nd segment yellow 

 with short yellow pubescence, sides of rest of abdomen narrowly 

 black with short black pubescence. Apical half of abdomen some- 

 times darkened. Venter yellowish, apical half more or less obscured. 

 Pubescence of 1st and 2nd segments with short yellow pubescence ; 

 on hind border of 2nd segment and on all the rest of the abdomen 

 the pubescence is black, though very short and inconspicuous. 

 Legs yellow ; about the hind half of anterior tarsi, and hind side of 

 hind tibiae, also all hind tarsi, brown or blackish. Wings pale 

 yellowish-grey ; subcostal cell and stigma pale yellow ; halteres 

 orange. 



Length, normally 12-13 mm. 



Widely distributed in India and the East, in both hills and 

 plains, throughovit the greater part o£ the year. 



Ti/pe in Fabricius collection. 



52. Asarcina aegrota, Fabr. 



Eristalis mjrota, Fabricius, Syst. Antl. p. 243 (1805). 

 Asarcina cec/rota, Brunetti, Rec. Iiid. Mas. xi, p. 210 (191o). 



Syrphus infirma, Eondani, Ann. Mas. Gen. vii, p. 423 (1875). 



S $ . Head : eyes, vertical triangle and occiput as in A. erice- 

 torum ; f rons and face shining black, closely covered with 

 yellowish-grey tomentum, on former with black hairs, and with 

 whitish tomentum and pale yellow hairs on latter ; antennal 

 prominence shining black except for a small space below in front ; 

 bare with sparse black hairs; central bump and a stripe from base 

 of antennae down to it shining black. Antennae with 1st and 2nd 

 ■joints black, 3rd narrowly black, but orange on more or less of 

 basal half below ; arista blackish ; mouth-border blackish. In 5 , 

 frons about one-eleventh or one-twelfth of head at vertex, 

 gradually widening to about two and a half times as wide at level 

 of antennae, mainly shining black, with sparse black pubescence, 

 but with a yellowish-grey dust-spot on each side on eye-margin, 

 iust above antennal prominence, the spots nearly united at their 

 inner ends. Tliorax : dorsum shining black with short dark 

 brown pubescence; a collar of erect bright yellow hairs on front 



