PLATE I. 



All the figures were taken from Tabanus sulcifrons. 



Fig. 1. Anterior of head of male. The greater part of this view is. 

 occupied by the compound eyes on the surface of which are to be seen the 

 transverse green bands which are represented by heavy black lines. The 

 space included within the dotted lines represents the location of the enlarged 

 facets, a, vertical triangle; b, first segment of one of the antennae; 



c, frontal triangle, a plus c form the front;, d and e, face, e, cheek; f, 

 one of the maxillary palpi; g, proboscis; h, labella. 



Fig. 2. Anterior view of head of female, c, front which includes, 

 all the space down as far as the base of the antennae; b, frontal callosity 

 with linear extension above; a, subcallus ; d, f, face, f, cheek; e, basal 

 segment of antennae; g, maxillary palpus. 



Fig. 3. Side view of proboscis and maxillary palpus of female, c, 

 proboscis; d, labella; a, basal segment; b, apical segment of a maxillary 

 palpus. 



Fig. 4. Mouth parts of female, a, apical segment; b, basal seg- 

 ment of maxillary palpus; c, maxilla; d, mandibles; e, hypopharynx ;, 

 f, labrum. 



Fig. 5. Mouth parts of male, a, b, maxillary palpus; c, maxilla;. 



d, labrum; e, hypopharynx. 



Fig. 6. Dorsal view of segments 8, 9, 10 of the male abdomen., 

 n, p, q, segments 8, 9, 10, respectively; o, basal segment of clasper. 



Fig. 7. Ventral view of Fig. 6. n, q, r, segments 8, 9, 10 respect- 

 ively; o, p, segments 1 and 2 of claspers respectively. 



Fig. 8. n, o, p, dorsal view of segments 8, 9, 10 of female abdomen, 

 respectively. 



Fig. 9. Ventral view of Fig. 8. q, infraanal plate. 



Fig. 10. Same as Fig. 6, showing different position of male claspers. 



Fig. 11. Same as Fig. 7, showing different position of claspers. The- 

 second segment of the. claspers is folded under the first. 



Fig. 12. Last segment of female front tarsus, a, pulvillus; b, claw;: 

 c, empodium. 



Fig. 13. Last segment of male front tarsus lettered as in Fig. 12„ 



Fig. 14. Female antenna, i, j, k, segments 1, 2, 3 respectively. 

 The third segment is prominent at base and composed of five annulations^ 

 the basal one of which is longer than the others combined. 



Fig. 15 Male antenna. 



