igii.j G. RiCARDO : Revision of the species oi Tabanus. 117 



16. Large yellowish s]>ecies with blackish 



bands on the abdomen . . aurifiamma, Wlk. 



Group VII. 



17. First posterior cell closed. Yellow- 



ish species with indistinct median 



black stripe on abdomen . . annainitus , c , Bigot. 



First posterior cell open . . 18. 



18. Frontal callus oblong or narrow with 



lineal extension. Forehead at 

 least five times as long as it is 

 broad . . . . . . 19. 



Frontal callus large, somewhat pro- 

 tuberant, almost square, with 

 short lineal extension. Forehead 

 three or four times as long as it 

 is broad . . . . . . 36. 



ig. Abdomen with a median stripe and 



lateral stripes or spots . . 20. 



Abdomen with one median conti- 

 nuous stripe only, no lateral spots, 

 or only isolated ones on the second 

 segment . . . . . . 27. 



Abdomen with lateral stripes only . . 35 . 



20. Frontal callus with a spindle-shaped 



lineal extension . . . . 21. 



Frontal callus with the lineal exten- 

 sion not spindle-shaped . . 22. 



21. Abdomen blackish or reddish brown 



with grey median and lateral 

 stripes, almost all the same 

 length .. .. .. styiatus,'FahT. 



Abdomen with the grey median stripe 

 beginning only on the third seg- 

 ment, and with lateral stripes end- 

 ing on the third or fourth seg- 

 ment .. .. .. Iiilans, Wlk. 



22. Abdomen with a median stripe, the 



side spots small and indistinct . . 23. 



Abdomen with a median stripe, the 



side spots large and distinct . . 24. 



23. Smaller species. Abdomen reddish 



yellow, darker at apex. Thorax 

 blackish. Forehead eight times 

 as long as it is broad • • abhreviatus , Bigot. 



24. The median abdominal stripe com- 



posed of almost equal sized spots, 

 not very large 



25. 



