i26 Ml-. E. E. Austen on new 



darker femora, wliicli are dark brown at the ti])s, by its 

 shorter stigma (the dark portion being confined to the distal 

 half), by the light mark in the wing beyond the stigma 

 being more elongate, by the palpi being clothed with black 

 instead of yellowish or ochraceous hair, and by the first joint 

 of the antennae being rather more elongate and less swollen 

 (the second and third joints are wanting in the type of 

 H. unicolor). The frontal callus in the type of H. duttoni is 

 similar to that of H. uniculoi' in colour and size, but has a 

 well-marked median upward process ; the median dark 

 brown spot below the callus is also well-marked, though, as 

 usual, of small size, and is apparently what Newstead means 

 by " a broad rectangular spot of light rich chestnut between 

 the eyes " {op. cit. p. 42), Avhile the " clypeal spots" referred 

 to by the author {op. cit. p. 42) are merely the usual punc- 

 tured depressions on the face, which are common to the 

 gcnus< 



Genus Tabanus, Liim. 



Tabanus ivilliunisii, sp. n. 



5. — Length (1 specimen) 12-3 mm.; width of head 

 4*2 mm. ; width of front at vertex 0-4 mm. ; length of wing 

 10 mm. 



Allied to T. ive/lmaniinud T. sharpei, Austen, and T. arrjen- 

 teus, Surcouf. — Front extremely narrow, upper part silvery 

 ivhite when viewed from above, a quadrate area on vertex clove- 

 brown ; dorsum of thorax clove-brown, with a transverse band 

 of silvery white pile on hind border, and in front with a pair 

 of light grey stripes scarcely extending beyond transverse suture ; 

 scutellum mouse-grey, extreme base olive-grey, entirely clothed 

 with pale chrome-yellow mi.vad with longer yellowishor brownish 

 hair ; abdomen clove-broivn, second segment dark seal-brown, 

 hind angles of alt segments except last clothed with short 

 yelloivish hair, third and fourth segments each with a large 

 bluntly triangular or semicircular median spot clothed ivith 

 similar hair. 



Head: face, jowls, and occiput light grey, pollinose, face 

 and jowls clothed with silvery hair; frontal callus and sub- 

 callus (? denuded) dark brown, former elongate quadrate, 

 extending from eye to eye ; front between dark ocellar or 

 vertical area and callus -clothed, with minute whitish hairs, 

 its sides converging below ; terminal joint of palpi fairly 

 stout, fawn-coloured, clothed on outer side with minute 

 appressed silvery hairs ; first joint of antennae smoke-grey, 

 fawn-coloured on distal half of inner side, clothed with 



