CHRYSOGASTER. 275 



sometimes interrupted, and in some species are replaced by indistinct 

 wrinkles. 



These flies chiefly frequent the Ranunculi and CaltJia palustris 

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

 may be thus grouped : 



a. Thorax with three longitudinal stria?. Species 1. 

 a a. Thorax without stria3. 



b. 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. Antennae with the third joint red. Species 4. 

 e e. Antenna) piceous. Species 5. 

 c c. Epistoma without tubercles. 



/. Front transversely furrowed. Species 6. 

 //. Front without furrows. Species 7. 

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



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

 lenea, antennis fcrrugiueis, thorace striato, scutcllo marginato, alis 

 subcinereis, abdomine atro lateribus cupreo apice et subtus a3neo. 

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



Greenish-aeneous. Head greenish-black, punctured. Antennae 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. 

 cupraria ? Mg. ; Mq. Antennis rufis, alis cinereis, abdominis disco 

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

 Eenea, alis ad costain luridis. Long. 3 ; alar. 6 lin. 



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

 grey. Halteres yellow. Disc of the abdomen dark purple. Tarsi 

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

 Fern. j^Eneous. Vertex broad, transversely furrowed on each side. 

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



Bare. In the collections of the Entomological Club and of 

 Mr. Stephens. 



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

 busque piceis, alis subcinereis ; Mas. abdomine basi lurido. Long. 

 2i-3i ; alar. 6-7 lin. 



Cupreous. Head greenish-black. Antennae piceous. Wings pale 

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



