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annulations of which the first is slightly longer than the followings 

 together and is itself faintly annulated and is distinctly dilated near 

 its base, but the three following ones are very short, and the apical 

 one is blunt at the tip, bearing no trace of an apical style and shorter 

 than the three preceding ones together. Proboscis considerably 

 produced but about equal as long as the depth of the head and with 

 rather large sucker-flaps ; palpi about half as long as the proboscis and 

 lying against it in the female, or directed rather upwards in the male. 



Thorax almost quadrangular with the angles rounded off, but 

 in the male almost round ; humeri rather small, the praealar callosities 

 large but very slightly convex and triangular ; pubescence fairly 

 abundant especially towards the sides, but is almost always denuded 

 on the disc when the flies caught by net ; pleurae considerabely pubes- 

 cent on the upper part and on the meta-pleurae and ptero-pleurae ; 

 but there is no trace of bristles or bristly hairs on the thorax or 

 scutellum ; scutellum usually triangular with the apical angle rounded 

 off, covered with rather dense pubescence. 



Wings with blackish costal margin, and with conspicuous 

 blackish markings, which usually form an irregular band across the 

 wing, and which are more extended in the male than in the female, 

 the .blackish band of the wing is one of important point of specific 

 characters ; in life the wings are extended half open when at rest. 

 Venation of the normal type of the Tabanidae ; the four posterior cells 

 always wide open, and not even contracted at the tip ; anal cell 

 usually closed, but sometimes slightly open. Squamae rather large, 

 bearing very slight fringes except near the angle on the alar pair, 

 llalteres with the knob rather large and almost globular. 



Fore coxae considerably lengthened, about two-thirds the length 

 of the femora ; femora slightly shorter than the tibiae, the fore one 

 covered with fairly abundant pubescence ; middle and hind tibiae with 

 two rather unequal apical spurs, the latter somewhat dilated ; pulvilli 

 three, very distinct. 



