TABANID^ 



325 



broader than long, with a frontal tubercle (in European species) 



about four times broader than long. 



1. H^MATOPOTA. 



5 



(4) Wings mainly hyaline without spots or dots (in British species). 

 Third antenna! joint dilated and dorsally humped near its 

 base (fig. 214), and with four subsequent annulations. Trons 

 of the female much longer than broad, with the frontal tubercle 

 absent, quadrate, or longer than broad. 2. Tabanus. 



Fig. 212. — Hexatoma pellucens (J. x 13. 



Fig. 213.— Hcematopota pluvialis ,$. x 16J 



1 (4) Eyes pubescent. 



2 (3) Ocelligerous tubercle more or less distinct. Upper branch of the 

 cubital fork simple. Thekioplectes. 



3 (2) Ocelligerous tubercle absolutely absent. Upper branch of the 

 cubital fork (in British species) with a recurrent veinlet (fig. 215). Atylotus. 



4 (1) Eyes bare. Ocelligerous tubercle absent. 



Tabanus (sensu stricto). 



Fig. 211. — Tabanus aiUiimnalis ? . 

 X 20. 



Fig. 215.— Atylotus fulv-us 9. x 6J. 



6 (1) Hind tibiae with apical spurs (fig. 216). Ocelli usually 



present. PANGONiNiE (p. 422). 



7 (8) Second antennal joint as long (or almost as long) as the first. 



Wings with conspicuous black bands or markings. Frons of 

 the female with a tubercle or callus. 3. Chrysops. 



8 (7) Second antennal joint distinctly shorter than the first. Wings 



without black bands or markings, even though there may be 

 small spots or a brownish smudge across the middle. 



9 (10) Third antennal joint with eight annulations of which the first is 



broad and short, being not much longer than broad (fig. 217). 

 Proboscis exceedingly produced, horny, with very small pointed 

 sucker-flaps. Face (and frons of the female) without any 

 tubercle or callus. Pangonia. 



