Hutton. — On the Diptera brachycera of New Zealand. 11 



divided into distinct joints, always without style or bristle. 

 Empodium much developed and pulvilliform " (Loew). 



Key to the Genera. 



Hind tibia? without spurs ; no ocelli. 



Third joint of the antennae with a basal tooth . . Tabanus. 



Third joint of the antennae without a basal tooth . . Sylvius. 

 Hind tibiae with spurs ; ocelli present. 



Proboscis much longer than the palpi . . . . Pangonia. 



Proboscis hardly longer than the palpi . . . . Apatolestes. 



Genus Tabanus, L. 



Proboscis inclined backwards in the male, perpendicular in 

 the female. Third joint of the antennae elongated, divided 

 into five divisions, of which the four last are small, and the 

 first division has a tooth at its base. Eyes in the male con- 

 tiguous, slightly separated in the female. No ocelli. Middle 

 tibiae spurred, but not the hinder ones. The eyes have long 

 hairs in the male, and generally short hairs in the female. 

 The second longitudinal vein is simple. 



Key to the Species. 

 Abdomen reddish. 



Smaller; length, 9-10 mm. 

 Larger; length, 12-14 mm. 



Abdomen with a dark dorsal streak. 

 Thorax without bands .. 

 Thorax with three pale bands 

 Abdomen without a dark dorsal streak 

 Abdomen blackish, with reddish spots on the sides. 

 Spots on the first three segments 

 Spots on the first and second segments 

 Spots on the second segment only 

 Abdomen pitch-brown, without tawny spots. 

 Thorax with pale bands 

 Thorax without pale bands 



T. transverstis. 



T. oplus. 

 T. sordidus. 

 T. impar. 



T. impar. 



T. bratranchii. 



T. gravis. 



T. sarpa. 

 T. viridis. 



Tabanus impar. 



Tabanus impar, Walker, Gat. Dipt, in Brit. Mus., part v., 

 Supp., p. 258 (1854) ; Hutton, Cat. Dipt. N.Z., p. 19. 



Palpi pale-tawny, the proboscis dark-brown ; antennae 

 fuscous at the tip. Thorax dark-brown, with short pale hairs. 

 Wings brownish, darker in the costal, marginal, and interior 

 basal cells. The sexes differ. 



Male. — First and second joints of the antennae dark red- 

 dish-brown. Abdomen blackish -brown, with a triangular 

 white spot in the centre of each segment ; margins of the seg- 

 ments and a large spot on each side of the first three segments 

 dull-red. Legs brown, the fore and middle tibiae tawny in the 

 basal half, but the colours are variable. 



Female. — Head and first two joints of the antennae pale- 

 tawny. Abdomen dull-red, fuscous at the tip. Legs tawny, 

 the tarsi fuscous. 



