FAMILY TABAXID.E THE HORSE FIJES 



153 



15. Third antennal segment with four annuli; frons of female wide; fork 



of third long-itudinal vein with appendix (7, 28) . . .Hjematopota Meigen 

 Third antennal segment usually with five annuli; when with less the 

 frons of female is narrow and the fork of third longitudinal vein 

 bears no appendix 16 



IG. Third antennal segment not at all or barely angulated above 17 



Thiril antennal segment with distinct angle or process near the base 

 above; ocelli rudimentary or absent 20 



17. Ocelli present and of normal size; all tibige not or hardly swollen. 



Merycomyia Hine 

 Ocelli absent; at least fore tibi« swollen 18 



18. Fore tibiae swollen; mid and hind tibise normal; palpi swollen at base, 



pointed at apex (8, 18) Diachlorus Osten Sacken 



All tibite swollen, the fore pair most; palpi flat and broad 19 



19. Third antennal segment broad and flat; subcallus divided by a median 



line Selasoma Macquart 



Third antennal segment narrow and slender; subcallus not divided 

 medially (6, 17, 21 ) Lepiselaga Macquart 



Tabanidffi III. — 28, Haematopota punctulata; 29, Esenbeckia prasiniventris ; 30, Stibasoma 

 fulvohirtuin ; 31, Buplex rasa; 32, Tabanus nervosus; 33, Biiplex rasa; 34, Melpia venosa; 

 3r>, Meipia. 



