DIPTERA. 31 



club-sliaped, shining, pitchy ridge on the fore-crown -. eyes bronze, parted 

 above by a rather broad interval ; facets very small, but slightly increasing 

 in size towards the inner fore part: sucker black, stout; lancets bright 

 pale ferruginous ; palpi dark tawny, thickly clothed with veiy short black 

 hairs : feelers black, long ; first and second joints clothed with black hairs ; 

 third joint convex beneath, its horn very long, much curved downward ; com- 

 pound joint long, hardly curved upicard : chest grayish-black, dark ferru- 

 ginous and tinged with hoary on each side, adorned with two slender hoary 

 stripes : breast hoary, partly clothed with whitish hairs : abdomen slightly 

 obconical, finely punctured, clothed with short black hairs, longer than the 

 chest ; a patch of white hairs on each side of the first and second seg- 

 ments, and another patch on the hind border of the fourth segment ; under 

 side adorned with a patch of white hairs on each side of the hind border 

 of every segment: legs black, clothed with short black hairs; foot-cushions 

 tawny : wings gray, tawny at the base and along the fore border as far as 

 the brand, which is dark brown ; a large brown spot below the brand 

 clouds also the borders of the veins in the disk ; wing-ribs ferruginous ; 

 veins black, ferruginous towards the base and along the fore border ; 

 angle of the tip cross-vein distinct, slightly obtuse, sending forth a short 

 stump ; (in one wing of the insect described the angle is slightly rounded 

 and has no stump) scales gray, with ferruginous borders ; poisers pitcliy, 

 with tawny tips. Length of the body 7^ lines ; of the wings 16 lines. 



Columbia. 



Tabanus detersus, Feni. 



Niger, thoracis tateribus pectore ventris vittis duabus et segmentorum inar- 

 ginibus posticis ferrugincis, antennis ferrugineis apice nigris, pedibus 

 fcrrugineis, tarsis anticis piceis, aiis cinereis. 



Body black : head tawny in front, clothed beneath with hoary hairs : 

 eyes bronzed ; the facets as usual : sucker black ; lancets and palpi ferru- 

 ginous . feelers dark ferruginous; first and second joints clothed with short 

 black hairs; third slightly convex beneath, forming above a shalloio and ex- 

 tremely obtuse angle, whose fore side extends to the tip and is twice the 

 length of the hind side ; compound joint black, slightly curved upward, much 

 shorter than the third joint : breast and sides of the chest ferruginous, with 

 a hoary tinge : abdomen linear, conical at the tip, mucli longer than the 

 chest; hind borders of the segments and a Iiroad stripe on each side be- 

 neath dark ferruginous : legs ferruginous : fore-feet and tips of the otlier 



