POTAMANAX. By Dr. M. Dratot. 899 



wing shows a very broad hyaline discal band and a narrow one behind it, Beneath white with greyish -black, 

 spotted transverse bands. From kSurinam. 



26. Genus: Potamaiiax Wts. 



ITiis genus contains more than a dozen of rather small species with comparatively short and broad 

 forewings, -with, a rather romided apex, mostly darlc-coloured, with a whitish or yellowish discal area. The 

 antennal club is strong, bent. The 3rd palpal joint is rather long, straightly porrect. The cell of the forewing 

 is short and narrow, the lower median vein rises almost just as distant from the base as from the upper median 

 vein, the latter rising rather near the lower cell-angle. The posterior tibiae exhibit 2 pair of spurs, but no hair- 

 pencil. 



P. pammenes G. & S. (175 e) is a small species, above blackish-brown with a rather broad, white pammenes. 

 discal band which is rounded and narrowed on the forewing, not reaching the costal margin and with a faint 

 yellow tint towards the proximal margin. The dark ground-colour is postdiscally somewhat lighter in the .shape 

 of a band. The under surface is much lighter, the hindwing as far as the base greyish-white. From Nicaragua. 



P. unifasciata Fldr. (175 e) approximates the preceding, but it is easily discernible by 5 minute, unifa-sciata. 

 white, subapical dots and orange-yellow colouring at the proximal margin of the white discal band on the fore- 

 wing. Colombia (Bogota). 



P. thoria Heiv. differs from pammenes (175 e) by a considerably narrower white discal area, particularly thoHa. 

 on the forewing. Ecuador. 



P. melicertes G. cfc S. (175 e) is likewise closely allied to the preceding and separable by the white melicertes. 

 discal area being slightly smoked in a brownish shade, reaching the costal margin on the forewing and being 

 somewhat snapped off below the median veins, whilst on the hindwing it does not reach the proximal margin^ 

 From Panama (Chiriqui) and Costa Rica. 



P. flavofasciata Hew. (175 f) has only on the forewing a band of j^ellow colour shaped sid in pammenes, flavojasda- 

 the hindwing remaining quite black, except a lighter part at the costal margin at most. Ecuador, Bolivia. '^" 



P. xantholeuce Mah. (175 f) has likewise a yellow discal band occurring, however, also on the hmd- xantholeuce, 

 wing. The wings are of a lighter brown, before the margin somewhat dark in the shape of a band, and also 

 postdiscally at the costal margin and behind the cell clouded darker. Beneath the hindwing is bluish-grey in 

 the anal half and at the base. Panama. 



P. fassli sp. nov. (175 f) is somewhat similar, but the yellow discal band on the forewing has the fassU. 

 shape of an oval spot and reaches neither the costal margin nor the proximal margin. The light distal area is 

 veined dark, while the band is not. The spot of the hindwing is of a purer white, at the costal margin ver3'^ 

 much expanded and scarcely extends beyond the median. Beneath the hindwing is almost enthely white, 

 except a narrow brownish-grey marginal part with some small light spots in it, at the base it is somewha^t bluish. 

 Several specimens from Colombia (Rio Negro, Sosomoco) and Bolivia (Songo). 



P. latrea Heiv. (175 f) initiates another group of mostly somewhat larger species, in which the forewing lafrea. 

 shows behind the white, mostly darker veined discal area a second brownish, smoked band sharply intersected 

 by the black veins, appearing in the present species between the median vein and lower radial vein and exliibiting 

 above it towards the margin 2 smaller spots besides; the forewing exhibits an indistinct, antemarginal row of 

 brownish dots. The white discal area is smoked brown towards the costal margin. From Nicaragua. 



P. thestia Heiv. (175 f) is in the (^ similar, the band of the forewing broader, as far as the costal the^tia. 

 margin of a pure white, not reaching the proximal margin on the hindwing; on the forewing there is a yellow 

 spot in the submedian area near the base. In the 2 the band of the forewing is smoked grey. Ecuador. 



P. paralus G. & S. (= thestia Drc. neo Hew.) (175 f, g) is almost the same, but it has a considerably paralus. 

 narrower white band being still more shortened particularly on the hindwing. Peru. 



P. effusa sp. nov. (175 g) is the most closely allied to fassli (175 f). The ground-coloiu- is a much effusa. 

 duller greyish-brown, the broad, whitish band extending from the costal margin to the proximal margin is 

 distaUy not sharply defined; behind it there are yet some whitish diffuse spots, particularly distinct in the 

 submedian area and between the radial veins. Hindwing as in fassli. Beneath almost entirely Avhite. From 

 East Colombia (Rio Negro). 



P. confusa sp. nov. (175 g) is very similar, the band much narrower, quite faded and ochreous- confusa. 

 yellow ; also on the hindwing it is narrower and extends farther to the proximal margm, which is haired light 

 greyish-blue. Beneath white, tinted ochreous, with a light blue base of the hindwmg and a light brownish- 

 grey apical part of the forewing and distal margin of the hindwing in which there are small light spots. From 

 Panama. 



