EEISTALIS. 



Mesonotum otherwise marked or uniform in colour; eyes 

 pilose 2. 



2. Mesonotum uniform in colour, or with feeble markings . 3. 

 Mesonotum conspicuously opaque-black and ashy ... 9. 



3. Large, black species ; all the tarsi and the four anterior 



tibise light yellow persa, sp. n. 



Tibiae and tarsi not so marked 4. 



4. Arista plumose ; thickly fulvous-pilose ; abdomen of the 



male for the most part red, of the female black . . circe, sp. n. 

 Arista barc 5. 



5. Hind tibire compressed and densely ciliate ; large species ; 



thorax densely f alvous-pilose 6. 



Hind tibiae not compressed and ciliate 7. 



6. Front below and frontal triangle wholly light yellow- 



pilose ; abdomen light yellow-pilose, with opaque black 



and metallic green cross-bands obsoletus, Wiedem. 



Front, frontal triangle, and abdomen chiefly black-pilose, 

 the latter in great part shining black ; wings with a 

 brown spot pachypoda, Bigot. 



7. Mesonotum shining greenish-black, clothed with yellow 



or yellowish pile ; second abdominal segment with a 

 posterior, velvety black, interrupted or subinterrupted 



cross-band latifrons, Loew. 



Mesonotum otherwise coloured; no shining black on the 

 second abdominal segment 8. 



8. Head and thorax yellow or brownish-yellow, the meso- 



notum not shining ochraceus, Willist. 



Head and thorax black bellardi, Jaenn. 



9. Mesonotum with four opaque black stripes, the median 



pair in the shape of a tuning-fork furcatus, Wiedem. 



Mesonotum not striped 10. 



10. Mesonotum, behind the suture, with three opaque black 

 spots — the median one suboval, the lateral ones 

 triangular trigonus, sp. n. 



Mesonotum opaque black behind the suture, with two 

 median, oval ashy spots, and a similarly coloured 



lateral, oblique one . . cosmius, Schiner. 



* 11. A shining or opaque grey band in front of the scutellum . 15. 



Mesonotum opaque black behind the suture to the 

 scutellum; eyes pilose 12. 



12. Pile of frontal triangle light yellow or white, of the front 



black above only ; hind femora but little thickened . 13. 

 Pile of the frontal triangle and the front below more or 

 less black 14. 



13. A black band before the ashy sutural band ; second 

 biol. centr.-amek., Dipt., Vol. III., February 1892. 



