igii.] G. RiCARDO : Revision of the species of Tabanus. i8i 



brown-red the margins of the segments posteriorly with pale mar- 

 gins and very short white hairs. 



Wings sub-Hmpid, the costal border brown yellowish, the 

 stigma browner. Calyptera ferruginous. Halteres with the knob 

 yellow, the stem red. Legs brown-red ; the apices of femora and 

 tibiae and all tarsi blackish. Rondani, Ann. Mus. Civ. Genova, vii, 

 p. 457. From vSarawak Province. 



Type 9 in Nat. Hist. Museum , Genoa. A specimen 9 in Brit. Mus. 

 coll. from Sandakan, N. Borneo, compared with type, is identical. 



The type in good preservation, measures 20 mm., the black spots 

 mentioned in original description seem accidental stains or marks, 

 the median spots only commence from the third segment, the 

 thorax and scutellum are covered with grey tomentum, being 

 reddish in colour. 



A species nearly allied to Tahanus dissimilis, n. sp., distin- 

 guished from it by its lighter redder thorax, abdomen and legs. 

 The abdomen is shining, uniformly reddish with grey median spots 

 from the second to the sixth segments, and with greyish narrow^ 

 segmentations, the little pubescence present, cliiefly black. 

 Forehead, frontal callus and palpi similar to those of Tahanus dis- 

 similis. Legs reddish brown, the tarsi and apices of tibiae darker, 

 the fore femora on under side and hind tibiae at base with some 

 white hairs, the pubescence otherwise black. The specimen from 

 Sandakan measures 22 mm. This species is not unlike Tabanus 

 yubicundus, Macq., but is distinguished from it by the greater 

 narrowness of the forehead anteriorlv. 



Tabanus nexus, 9 , Walker, 



Proc. Linn. vSoc, i, p. no (1875). 



Type 9 from vSarawak, Borneo (Saunders coll.). 



A large species very nearly similar to Tabanus ignobilis, 

 Rondani, from which it is only distinguished by the wings being not 

 quite clear, but deeply tinged with yellowish brown on the fore 

 border along the veins, and in the discal cell, reaching beyond its 

 borders. The palpi are stouter, almost the same width throughout, 

 so that their apices are obtuse. There are no white hairs on the 

 hind tibiae, but the white pubescence on all the femora is distinct, 

 thickest on the fore pair. 



Forehead about nine times as long as it is broad, and hardly more 

 than a third narrower anteriorly, frontal callus not reaching eyes ; 

 owing to its great similarity to Tabanus ignobilis, Rondani, this spe- 

 cies is placed next to it though strictly speaking it should go under 

 the heading of foreheads one-third narrower anteriorly in the table. 



Tabanus signifer, cf , Walker. 

 Ins. Saund. Dipt., i, p. 452 (1856). 

 Type cf from China. 



