228 SYRPHIM5, 



6. Proboscis very slendei*, euormously pro- 



duced, twice as long as the very pro- 

 duced epistome ; latter 2 to 3 times as 

 long as width of eyes in profile; vena- [p. 276. 



tion distinctly abnormal Lycastbis, Walk., 



Proboscis normal, never conspicuously 

 slender nor extremely elongate; epi- 

 stome very considerably produced (like [p. 280.. 

 that of Rhim/ia) ; venation normal. . . , Ceiorrhina, Meig., 



7. Densely pubescent species Braohypalpus, Macq., 



Inconspicuously pubescent species 8. [p. 275. 



8. Thorax with conspicuous yellow markings [et Serv., p. 261. 



apart from those on humeri Temnostoma, St. Farg. 



Thorax without yellow markings ; or at 

 most on humeri only 9. 



9. Face not cut away below antennae; outer 



side of 1st posterior cell distinctly 



angled Eumerus, Meig., p. 248.. 



Face more or less distinctly cut away 

 below antennae ; outer side of 1st pos- 

 terior cell not angled as in Eumerus . . 10. 

 10. Face subcarinate ; hind femora con- [Serv., p. 244. 



spicuously incrassate Sy'RITTA, St. Farg. et 



Face not carinate ; hind femora much less 



conspicuously incrassate Xylota, Meig., p. 231. 



Genus MYIOLEPTA, Neivm. 



Myolepta, Newman, Ent. Mag. v, p. 373 (1838). 



Xylotccja, Rondani, Nuov. Annal. Sci. Nat. Bologna, (2) ii, p. 457 



(1844). 

 Leptomyid, Walker, Ins. Brit., Dipt, i, p. 254 (1851). 

 XUoteju, Ilondaui, Archiv. Zooh iii {sep.), p. 9 (1863). 



Genotype, Musca luteola, Gmel., by original designation. 



Head short and broad, ratlier broader than tliorax ; eyes bare, 

 contiguous in J for a considerable space, not very widely sepa- 

 rated in 2 ; ^i^c^ hollowed below antennae, facial knob conspicuous 

 in c5 ) the face retreating again below it before being produced 

 over the mouth ; in § , the central knob absent, but the lower 

 production of the face is somewhat cut away on its distal 

 extremity*. Antennae with 3rd joint longer than broad, the 

 nearly basal arista bare. Thorax rather strong and arched, 

 narrower in front ; scutellum marginate behind ; both pubes- 

 cent, without bristly hairs. Abdomen as broad as thorax, ovate. 

 Legs rather strong, femora thickened towards tip, serrate below, 

 especially hind pair, without any obvious tooth ; all tibiae slightly 

 curved. Wings fairly normal in venation ; marginal cell widely 

 open, 3rd vein nearly straight, anterior cross-vein a little before 



* See Verrall, Brit. Flies, Syrphidte, p. 573, tJg. 400, J, 401, ?, heads in 

 profile. 



