SOME SIAMESE TABANIDAE. 437 



of discal cell (in the case of the type, in practically every cell crossed by the band 

 the latter is interrupted by a large hyahne streak, so that the band itself is composed 

 of mummy-brown borders to the veins, but this condition is doubtless due to individual 

 aberration). Squamae, deep mouse-grey, scantily fringed with fine yellowish hair ; 

 borders of squamae mummy-brown, outer edges ivory-yellow. Halteres, cream-buff, 

 stalks and under surface of knobs more or less mummy-brown. Legs : entireh- black 

 and clothed exclusively with black hair ; front tibiae not thickened ; front tarsi 

 in 2 not conspicuously expanded, but with distal angles of penultimate segment 

 considerably produced. 



Chiengmai, lO.v.1921. With reference to the holotype of this species. Dr. M. E. 

 Barnes, in whose honour the author has much pleasure in naming it, writes as 

 follows : — " Caught at about 5.0 o'clock p.m., attacking me while I was seated on 

 the verandah of my house ; this is the only specimen that I have seen." 



In addition to the foregoing specimen, the British Museum (Natural History) 

 also possesses an old, considerably damaged, and much faded ? of this species, taken 

 upwards of fifty years ago at Chantabun, S. Siam ( — Mouhot), and formerly in 

 the collection of the late W. W. Saunders. While certain differences from the specimen 

 selected as the type are noticeable, none of the points as to which divergence appears 

 can be regai'ded as more than varietal, and in some respects, as in the condition of the 

 transverse band on the wing, the example from Chantabun is probably the more 

 truly typical of the two. In the Chantabun $ the rib-like upward extension of the 

 frontal callus is concealed by the pollinose covering of the front, from a point a little 

 below the middle of the latter ; so far as can be seen, there is no trace of lateral 

 patches of whitish hair on the dorsum of the abdomen ; the anterior branch of 

 the third vein is without even a vestige of an appendix ; and the mummy-brown 

 transverse band on the wing is not interrupted by hyaline streaks. 



Tabaniis barnesi resembles T. {AtyJotus) nephodes, Bigot, of which the type, from 

 the Naga Hills, Assam {Captain Butler), and a second ?, from Sibsagar, Assam, 

 are now in the National Collection. While agreeing with the species in question 

 in its wing-marking, and in the first posterior cell being closed at some distance from 

 the wing margin, T. barnesi is, however, distinguishable (in the $ sex) inter alia by its 

 smaller size ; by the frontal callus being, if anything, somewhat larger and more 

 clearly differentiated from its rib-like upward extension ; by the jowls, pleurae and 

 lower part of the face being clothed with dark brown or black, instead of with whitish 

 hair ; by the dorsal surface of the scutellum, except at the base, being smoke-grey 

 pollinose, and clothed with glistening silvery-white hair ; by the total absence of 

 median, white-haired triangles on the dorsal surface of the abdomen ; and by the 

 appendix to the anterior branch of the third vein, which is long in T. nephodes, being 

 vestigial or absent. 



2. Tabanus nigrotectus, Big. 



Bellardia nigrotecta, Bigot, Nouv. Archiv. Mus. Hist. Nat., Paris (3) ii, 

 p. 204 (1890). 



Though stated by Bigot to be from " Laos," the type of this species, which 

 Baron Surcouf has most courteously sent to the writer for examination, bears labels 

 identical with those attached to that of Haematopota cilipes, Bigot (see above, p. 432). 

 T. nigrotectus therefore occurs in Southern Siam. The species was not among those 

 of which examples were forwarded by Dr. Barnes, but is represented in the National 

 Collection by a 9 from Cambodia, 1909 {John Surcouf, presented by Baron J. M. R. 

 Surcouf) . 



3. Tabanus insidiator, sp. n. (fig. 2), 



2.— Length (five specimens), 10 to 10-6 mm. ; width of head just under 

 4 to 4-5 mm. ; width of front at vertex, 0-6mm. ; length of wing, 9-4to 10mm. 



