SOME SIAMESE TABANIDAE. 



449 



Two ??, foot of Doi Sutep (alt. circa 1,200 ft.), near Chienginai, 7,9,iv.l921. 

 Dr. Barnes's lield-note on these specimens runs : " Caught while attacking my 

 horse ; a very common fly about horses in this localit}'." 



As shown by the series of specimens of this species already in the British Museum 

 (Natural History), the range of Tahanus rubidus extends at any rate from Bombay 

 to Hong Kong, and includes Nepal, Burma, the Federated Malay States, Singapore, 

 Cochin China and Annam. In Singapore, according to a note by Mr. P. S. Falshaw, 

 T. rubidus bites cattle as well as horses ; a $ from Pahang, Federated Malay States, 

 2,500 ft., 1916 [T. R. Hubback — presented by the Imperial Bureau of Entomology), 

 was taken on a specimen of Rhinoceros sumatrensis, Cuv. 

 11. Tabanus pugnax, sp. n. (lig. 6). 



Q. — Length (two specimens) 13-4 to 15-2 mm. ; width of head, 4-5 to 5 mm. ; 

 width of front at vertex, just over 0-5 mm. ; length of wing, 12-75 to 13-4 mm. 



Eyes bare, apparently ivith three purple bands ; a single elongate frontal callus 

 in $ ; dorsum of thorax, including scutellum, olive pollinose overlaid with greyish. 



Fig. 6. Head of Tabanus pugnax, Austen, sp. n., $ ; a, front view ; b. profile. 

 and itniformly clothed with appressed, glistening Naples yellow hair mixed with fine , 

 erect black hair ; dorsum of abdomen, brownish-tawny or brownish ochraceous-tawny , 

 with a more or less conspicuous, median, longitudinal stripe extending from front margin 

 of second {visible) to hind margin of fifth tergite, and composed of a continuous series 

 of truncate, ochreous pollinose triangles, clothed with appressed, glistening buff-yellow 

 hair ; fourth and foil oiving tergites, otherwise than as already stated, and with exception 

 of hind margins and posterior angles, mainly blackish-brown. 



Head : Front ochreous pollinose, clothed, at least on upper half, with minute, 

 fine black or blackish hairs, subcallus, face, jowls and occiput somewhat greyer 

 (dark olive-buff pollinose), sides of face clothed with fine blackish hair, occiput, 

 jowls and remainder of face clothed with pale yellowish hair, hind margin of occiput 

 fringed above with very short and inconspicuous ochreous hairs, inteiTupted behind 

 vertex by a series of somewhat longer fine black hairs ; front in $ somewhat narrow 

 or of medium breadth, slightly broader above than below, its length equal to about 

 71 or 8 times its breadth between lower inner angles of eyes, a narrow, dusky, indistinct, 

 elongate triangular mark on vertex, but no trace of an ocellar tubercle ; frontal 

 callus (see fig. 6 a), black, bottle-shaped, its base on a level with lower inner angles of 



