SOME SIAMESE TABANIDAE. 453 



neutral grey or deep neutral grey pollinose, all three pairs of coxae clothed with 

 whitish hair ; front femora olivaceous-black, neutral grey pollinose on outer side 

 below, clothed with fine black hair, which on lower border of outer side of distal 

 half is mixed with whitish or yellowish white hair ; middle and hind femora mouse- 

 grey (their distal extremities greyish cinnamon-coloured), clothed, except outer 

 surface of middle femora, with whitish hair, outer surface of middle femora clothed 

 with black hair ; tibiae, except rather less than distal half in case of front pair, 

 and rather less than distal fourth in that of middle and hind pair, ochraceous-tawny, 

 distal extremities of front tibiae blackish-brown or olivaceous-black, those of middle 

 and hind tibiae reddish-brown, tibiae clothed with black hair (flexor surfaces in case 

 of middle and hind pairs clothed with appressed cinnamon-buff hair), extensor 

 surfaces of hind tibiae (at least in ,^) fringed with fine and fairly long black hair ; 

 tarsi black (middle pair missing in case of type), first segment of hind pair paler 

 (sepia-coloured), all tarsi clothed with minute black hairs. 



Near Bangkok, vi.l921, caught in a railway carnage. With reference to this 

 species. Dr. Barnes writes ; — " I have seen a number of specimens of this fly." 



Wliat is quite possibly the opposite sex of T. pugiuncnlus to that of the type 

 is represented in the National Collection by a solitary ? taken at Phrapatoon, in 

 August, 1906 {Dr. P. G. WoGlley). While agreeing with the type in many respects, 

 such as in the presence of a pale (Naples yellow-haired) longitudinal median stripe 

 on the dorsum of the abdomen, in the character of the wings (including the shape 

 and coloration of the stigma), and in having strongly infuscated femora, this speci- 

 men exhibits certain differences — notably in the expanded portion of the third seg- 

 ment of the antennae being much deeper and entirely tawny (not dark brown at the 

 tip) ; in the dorsum of the abdomen being mainly dusky (fuscous, or olivaceous- 

 black), instead of russet with a dusky distal extremity ; in the venter (apart from 

 hind margins of segments) being uniformly neutral grey, without any trace of dark 

 median blotches ; and in the pale portion of the front tibiae being clothed with 

 glistening yellowish (Naples yellow) hair. The front is relatively rather broad 

 (4 to 4h times as long as its breadth between the lower inner angles of the eyes) ; 

 and there is a single, rather large, mummy-brown frontal callus, in shape resembling 

 an isosceles triangle, with its lower margin just above the level of the lower inner 

 angles of the eyes, and its upper extremity produced into a narrower extension, 

 nearly one-third of the front in width, which dies away at a point about one-third 

 of the length of the front from the hind margin of the vertex. The dimensions of 

 this specimen are as follows : length, 10-5 mm. ; width of head, 3-6 mm. ; width 

 of front at vertex, 0-5 mm. ; length of wing, 9 mm. 



As regards species liable to be confused with T. pugiunculus, it may be mentioned 

 that the British Museum (Natural History) contains three c?6^ of a (possibly undes- 

 cribed) species of Tabanus from Lower Burma (base of Dawna Hills, 4.iii.l908, 

 Dr. N. Annandale), which at first sight closely resemble that described above. These 

 specimens, however, may be distinguished by inter alia, their smaller heads, the 

 absence of a definite area of greatly enlarged facets in the eyes, and their pale 

 femora. 



Finally it may be remarked that Tabanus pugiunculus presents a certain super- 

 ficial resemblance to the Javanese T. cinerascens. Big., but is distinguishable, inter 

 alia, by its infuscated femora. 



13. Tabanus agnoscibilis, sp. n. 



2. — Length (one specimen) 10-4 mm. ; width of head, 3-2 mm. ; width of front 

 at vertex, 0-4 mm. ; length of wing, 9 mm. 



Small species, with apparently hare eyes, narrow front and single frontal callus in ?, 

 dorsum of thorax uniform deep greyish-olive, and tapering abdomen which, except lasf. 



