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known as the frontal triangle and the latter as the ocelligerous tubercle. 

 Face broad, with broad cheeks all down the sides which are much 

 more prominent than the epistoma and the cheeks bear more or less 

 bushy pubescence which continues on to the jowls and thence to the 

 lower part of the back of the head ; upper part of the back of the 

 head is hollowed, but the eye-marginal area is usually very little puffed 

 out in the female. Ocelli present or absent, but never conspicuous. 

 Proboscis powerful, produced, and bearing rather large sucker-flaps 

 which are usually furnished with a few short pubescence beneath. Palpi 

 very conspicuous, two-jointed ; basal joint short ovate and bearing a 

 long pubescence ; second joint elongate, in the male globular and 

 outstanding with a more or less blunt tip, and bearing a rather long 

 pubescence, in the female cylindrical and drooping to a point, lying on 

 the proboscis and mainly covered with rather depressed bristle-like 

 hairs. Antennae three-jointed, yellowish to blackish, in the female 

 roughly as long as, or in the male almost always distinctly shorter than 

 the head ; basal joint short but longer than the second, and often 

 produced cap-like over the base of the second, bearing numerous short 

 usually black bristle-like hairs and usually some rather longer thin 

 pubescence ; second joint very small somewhat cup-shaped, and furnished 

 with abundant short black bristles placed more or less in a subterminal 

 circlet; third joint elongate and five-annulated, the apical four annula- 

 tions forming a very stout style, the basal annulation large and long, 

 enlarged about its base and bearing on its upper side before or at the 

 middle a peculiar hump which varies in an extent from a moderately raised 

 hump to an arched hood. Eyes large, practically bare, or distinctly pubes- 

 cent, or sometimes only indistinctly pubescent in one or both sexes; in the 

 male usually conspicuously large, and touching for a long space, while 

 in the female quite separated by the frontal stripe ; eyes in life brilliant 

 coloured in some iridescent or opalescent tint of green, and usually 

 with purplish transverse bands; the eye-facets in the female all equal 

 but in the male often conspicuously or moderately enlarged on the 



