Dolichopodidae. 19 



2. Colour not metallic, or at all events abdomen not me- 



tallic coloured 3. 



— Colour metallic 4. 



3. Thorax and scutellum yellow or grey, not metallic; 

 hypopygium of the male free 2. Neiirigona. 



— Thorax and scutellum metallic ; hypopygium of the male 



small and concealed 3. Eutarsus. 



4. Hind metatarsus with bristles above 5. 



— Hind metatarsus without bristles above 6. 



5. Epistoma reaching below or down to (or almost to) 



the lower margin of the eyes 4. Hygroceleuthus. 



— Epistoma not reaching to the lower margin of the 



eyes 5. Dolichopus. 



6. Epistoma reaching to or almost to the lower margin 

 of the eyes ; hind femora with a number of preapical 



bristles 6. TachytrecJms. 



— Epistoma not reaching to the lower margin of the eyes ; 



hind femora with only one preapical bristle 7. 



7. Arista distinctly hairy, almost feathered ; the radial, 



cubital and discai veins somewhat near to each other 7. Poecilobothrus. 



— Arista less hairy or apparently bare; radial, cubital 



and discai veins less approximated 8. 



8. Shape not specially slender; front tibiæ with one or 

 two ventral bristles, or, if not, the postocular bristles 

 black ; hypopygium of the male not specially long, not 



much pedunculated and without long ventral lobes . . 8. Hercostonius. 



— Shape long and slender, front tibiæ without ventral 

 bristles ; postocular bristles pale below ; hypopygium of 

 the male long, with a somewhat long peduncle, and 



with long ventral lobes 9. Hypophylliis. 



II. Diaphorinae. 



Arista dorsal, or {Chrysotus) more or less subapical; the second 

 joint not or slightly overlapping the third, sometimes to a higher 

 degree; the third joint sometimes elongated in the male. The lower 

 part of occiput with dense hairs, in Chrysotus less dense. Acrostichal 

 bristles biserial ^ More than one prothoracic bristle, or only smaller, 

 more or less bristly hairs. Hind coxæ with one or several bristles 

 on the outside. Hypopygium of the male not pedunculated, more 

 or less hidden. — This subfamily seems to me somewhat natural. 

 Aldrich takes it in another sense, and piaces Eutarsus, Teucophorus 

 and Campsicnemus into it, whilst he excludes Argyra and Leucostola, 

 placing these genera with the Rhaphiinae. 



In the males of sorne species of Argyra the acrostichal bristles may appear 

 somewhat irregularly pluriserial on account of the hairiness of the thoracic disc. 



