SOME SIAMESE TABANIDAE. 



435 



19 (20 



Admedian paler markings on dorsum of abdomen practically confined 

 to second segment, wfiicli bears a pair of admedian spots (similar 

 spots, if present on any of following tergites, usually much less 

 distinct) .. .. .. .. .. .. brunnipcnnis'Iiic. [7] 



Admedian paler markings on dorsum of abdomen not confined to a 

 pair of spots on second segment, but much more extensive (see 18 

 above). 



Median longitudinal stripe on second abdominal tergite more or 

 less obsolete, at least much less distinct and well developed than 

 on following tergite. . .. .. .. .. striahis, Fa.br. [8] 



Median longitudinal stripe on second abdominal tergite not obsolete, 

 in any case just as distinct and well developed as that on following 

 tergite. 



Frontal callus blackish-brown ; expanded portion of third segment 

 of antenna cinnamon-rufous . . . . . . virgulatus, sp. n. [9] 



Frontal callus chestnut-brown or russet-coloured ; expanded portion 

 of third segment of antenna mainly or entirely blackish or blackish- 

 brown . . . . . . . . . . . . rubidus, Wied. [10] 



1. Tabanus barnesi, sp. n. (lig. 1). 



?. Length (one specimen), 15 mm. ; wddth of head, just under 5 mm. ; width of 

 front at vertex, 0-6 mm. ; between lower inner angles of eyes, 0-4 mm. ; length of 

 wing, 15 mm. 



Fig. 1. Head of Tabanus barnesi, Austen, sp. n., ^ ; a, front view ; b, profile. 



Dorsum of thorax, except scutellmn, olivaceous-black* scutellum, except extreme 

 base, smoke-grey pollinose, clothed above with silvery white hair ; abdomen black, first 

 five [visible) tergites each with a transversely elongate patch of short, whitish, appressed 

 hairs in each posterior angle ; wings with costal cells light cinnamon-broivn, and a 

 mummy-brown transverse band before distal extremity ; first posterior cell closed about 

 0-5 mm. from iving margin. 



* For names and illustrations of colours used for descriptive purposes in the present paper 

 see Ridgway, " Color Standards and Color Nomenclature " (Washington, D.C. Published by 

 the Author, 1912). 



