SOME SIAMESE TABANIDAE. 



451 



(front pair sometimes cinnamon-buff), their distal extremities dark brown, front and 

 middle tibiae clothed mainly with buff-yellow hair, distal extremities in both cases, 

 and distal two-thirds of extensor surface of middle tibiae clothed with black hair, 

 flexor surface of hind tibiae, except at tip, clothed with bright ochreous or ochraceous- 

 orange hair, extensor surface of hind tibiae fringed with black, or black mixed with 

 ochreous hair, tips of hind tibiae clothed with black hair ; tarsi blackish-brown 

 (first segment of middle tarsi more or less reddish brown), clothed above with minute 

 black hairs, third and fourth segments of front tarsi in female moderately expanded. 



Doi Chom Chang, near Chiengmai, alt. 5,500 ft., 12.iv.l921. Of the holotype 

 and the single paratvpe of T. pitgnax, Dr. Barnes writes : — " These flies attacked 

 me at about 10 o'clock a.m., at an altitude of 5,500 ft. ; this species is not uncommon." 



What would appear to be a variety of T. pugnax is represented in the National 

 Collection by two $9 from Siam (precise locality unknown), taken at light, 3.iii.l914 

 {K. G. Gairdner). These specimens, which are in poor condition, shrunken and 

 partly denuded, having originally been preserved in spirit, differ from the typical 

 form as described above mainly in the coloration of the femora, which are largely 

 or chiefly cinnamon or pinkish cinnamon-coloured, although, in the case of one 

 specimen, those of the hind legs are in places strongly tinged with brownish. 



The species just described is allied to Tabanus fulvimedius, Ric. (Rec. Ind. Mus., 

 Calcutta, iv, p. 197 (1911) — ncc Walk.), of Formosa, and to T.fidvimedioides, Shirak, 

 (Blood-Sucking Ins. Formosa, Pt. 1, Tabanidae, Taihoku, p. 219, pi. v, fig. 8, pi. xi 

 figs. 6, 7 (1918)), which is stated by its author to be fairly common in the south of 

 Japan. From both of these, however, in the ? sex at any rate, T. pugnax is distin- 

 guishable by its narrower front ; by the frontal callus (what is the lower callus in 

 T.fitlvimedioides, Shir., in which there are two frontal calli) being narrow and elongate, 

 with its upper extremity — instead of suddenly and abruptly contracted, as in 

 T. fulvimedius, Ric. — smoothly and directly continuous with the raised, lanceolate 

 ridge representing the upper callus ; and by the expanded portion of the third 

 segment of the antenna being deeper and shorter. 



12. Tabanus pugiunculus, sp. n. (fig. 7). 



o- — Length (one specimen), 13 mm. ; 

 10-6 mm. 



width of head, 4-5 mm. ; length of wing, 



Fig. 7. Head of Tabanus pugiunculus, Austen, sp. n., ^ ; a, front view ; b, profile. 



Dorsum of thorax, including scutellum, deep greyish-olive pollinose, uniforndy clothed 

 ivith minute, appressed, glistening Naples yelloia hairs, mixed with fine, erect, cream- 

 coloured hair ; dorsum of abdomen russet, fifth to seventh segments, inclusive, except 

 lateral and liind borders, olivaceous black, a smoke-grey pollinose, and from certain angles 



