CHRYSOGASTER. 275 



sometimes inteiTupted, and in some species are replaced by indistinct 

 wrinkles. 



These flies chiefly frequent tlie Ranuncidi and Caltlia paludris 

 on moist ground during the spring and the summer. The species 

 may be thus grouped : — 



a. Thorax with three longitudinal striae. Species 1. 

 a a. Thorax without stria\ 



h. Third joint of the antennae round. 

 c. Epistoma with tubercles. 



d. Wings at the base and stigma yellow. Species 2, 3. 

 d d. Wings at the base not yellow. 



e. Antenua3 with the third joint red. Species 4. 

 e e. Anteimai piceous. Species 5. 

 c c. Epistoma without tubercles. 



/. Eroiit transversely furrowed. Species 6. 

 //. Front without furrows. Species 7. 

 b h. Third joint of the antennae almost linear. Species 8. 



1. splendens, Mg. zw. iii. 266. 1 (1822); Mg. ; Lw. Viridi- 

 £enea, antennis ferrugineis, thorace striato, scutello marginato, alls 

 subcincreis, abdomine atro lateribus cuprco apice et subtus a^neo. 

 Long. 3i-3i ; alar. 7-8 lin. 



Greenish-ffiueous. Head greenish-black, punctured. Antenna? fer- 

 ruginous. Thorax with three very slight furrows ; a transverse furrow 

 near the tip of the scutellum. Wings pale grey. Halteres tawny. 

 Abdomen deep black, cupreous along each side, aeneous at the tip and 

 beneath. 



Not rare. (E. I.) 



2. chalybeata, Mg. zw. iii. 267. 4 (1822); Mq. ; Lw. ; Ztt.— 

 cupmria ? Mg. ; Mq. Antennis rufin, alls cinereis, abdominis disco 

 purpureo ; Mas. aureo-viridis, thoracis disco cupreo-purpureo ; Foem. 

 aenea, alis ad eostam luridis. Long. 3 ; alar. 6 lin. 



Antenme black ; second and third joints red ; third round. Wings 

 grey. Halteres yellow. Disc of the abdomen dark pm*ple. Tarsi 

 black. Male. Golden-green. Disc of the thorax cupreous-purple. 

 Fern. JEneous. Vertex broad, transversely fuiTOwcd on each side. 

 Wings with a lurid tinge along two-thirds of the costa. 



Rare. In the collections of the Entomological Club and of 

 Mr. Stephens. 



3. famipennis, Stph. Cuprea, capite nigro-viridi, antennis pedi- 

 busquc piceiH, alis subcincreis ; Mas. abdomine basi lurido. Long. 

 2^-31; alar. 6-7 lin. 



Cupreous. Head greenish-black, Antenna? piceous. Wings pale 

 grey, brownish beneath the stigma, which is tawny. Halteres tawny. 



