48 Families and Genera of 



inal voins, and subparallel with tliem, crossing- the anterior cross-vein, 

 a false or spurious vein, nearly always present, and characteristic; 

 face without subantennal grooves. 



Flower-flies, usually only to be found in liriglit sunshiny weather. 

 Larvaj found in decomposing organic matter, under bark, in soft 

 mud, etc.; pup;o enclosed in the larval skin, the fly escaping/througli 

 a circular anterior orifice (Di])tera cy cl or r h a ]>li a ). 



1. Antenna' with a terminal style. ..... 2 



Antennie with a dorsal bristle. . . . . . . '•> 



2. Antenna* cylindrical, first two joints elongate. . Ceki.a^ 

 First two joints short, third compressed. . . Pei.ecocera 



;]. Marginal cell of the wing closed and petiolate. . . 08 



Marginal cell open. ........ 4 



4. Anterior cross-vein of the wing distinctly before the middle of 



the discal cell, usually rectangular. . . . . . •'> 



Anterior cross-vein ending near or beyond the miildle of the dis- 

 cal cell, usually oblique. ....... 4M 



5. Antennae elongate. ........ (i 



Antennae short 11 



6. Dorsum of thorax without yellow lateral stripes. . . 7 

 Dorsum of thorax with yellow lateral stripes ; large species. 



' ClIKYSOTOXU.M 



7. Face rounded, pilose, not tuberculate, oral margin not project- 



ing. ........... 8 



Face not evenly arched; tuberculate, or the oral margin pro- 

 jecting. .......... !' 



8. Large species; scutellum flattened, usually with spines or tuber- 



cles; a stump of vein in the first posterior cell from the third 



longitudinal vein. Mkrodon 



Small species ; scutellum without i)oints ; no such projecting 

 stump I'iPizA 



9. Body clothed with sparse tomentum ; all the femora thickened 



and with a row of short spines below (see, also, Myiolepta 

 strigilata) o LEriDOSxoi.A 



Body not tomentose; all the femora not thickened and with 

 spines below. ......... 10 



10. Face tuberculate below, partly or wholly yellow ; epistoma re- 

 ceding ; face and front not wrinkled. . . 1'ahagus 



Epistoma projecting; front and face black. ... 10 



