274 SYRPHID^E. 



Antenna ferruginous. Disc of the thorax cupreous. Wings slightly 

 grey ; stigma lurid. Halteres luteous. Knees and tarsi tawny, the 

 latter black towards the tips. 

 Not common. (E.) 



2. nobilis, Fin. syrph. 57. 17 (1816); Mg. ; Mq. ; Lw. ; Zt 



/Eneo-viridis, antennis articulo tertio piceo subtusfermgineo, alis cinereis, 

 tarsis nigris. Long. 2^ ; alar. 5 lin. 



Male. ^Eneous-green. Antenna black; third joint piceous, ferruginous 

 beneath. Disc of the thorax cupreous. Wings grey. Halteres luteous. 

 Tarsi black. 



Rare. In Mr. Stephens's collection. (E. I.) 





Genus XXI. CHRYSOGASTER. 



CHRYSOGASTER, Mq. d. n. (1827). Musca p., L. ; Gm. Syrphus p., 

 Fb. e. s. ; Pz. Eristalis p., Fb. s. a. ; Fin. Milesia p. ? LI. Chry- 

 sogaster p., Mg. ; St. F. et Srv. ; Ztt. ; Lw. ; Rdn. 



Epistoma vix elongatum, ad os prominens. Antenna basi disjunct^, ca- 

 pitis latitudine conjunction breviores ; articulus tertius ovatns vel orbi- 

 culatus ; qiiartus dorsalis ; quint us nudus. Scutellum depressum, ad 

 marginem acutum. Alfe areola discali ab margine posteriore divaricata, 

 areola subapicali intcgra, lobo axillari distincto, venis subcostali et ra- 

 diali ad marginem disjunctis, vena transversa prabrachiali ante areolee 

 discalis medium insert a. 



Body almost bare. Colour metallic. Head semicircular ; epistoma 

 protuberant towards the mouth, but little elongated horizontally ; peri- 

 stoma prominent, oblong, narrower in front, inclined upwards. Eyes 

 bare. Labrum notched at the tip. Lingua acute. Maxilla? subulate, 

 not half the length of the palpi. Palpi curved, filiform, somewhat 

 clavate at the tips, slightly hairy, longer than the labrum. Labiura 

 seinicylindrical. AntennaB 5-jointed, porrect, nutant, seated on a 

 tubercle of the front, separated at the base, jointly shorter than the 

 breadth of the head ; first and second joints small; third oval or round; 

 fourth seated on the back of the third ; fifth setiform, bare. Scutellum 

 flat, with a sharp edge. Wings finely pubescent, incumbent and pa- 

 rallel in repose. Discal areolet diverging from the posterior margin ; sub- 

 apical areolet entire ; axillary lobe distinct ; subcostal and radial veins 

 ending separately in the margin ; transverse prcebrachial vein placed before 

 the middle of the discal areolet. Abdomen oblong, depressed. Legs 

 slender. Male. Epistoma most often with some tubercles. Eyes con- 

 tiguous. Thorax beset with fine hairs. Fern. Eyes remote. Front 

 with a row of oblique transverse furrows on each side ; these are 



