116 NOVITATBS ZOOLOGICAE XXIII. 1916. 



edged on the outer side by a conspicuous, somewhat broader, whitish grey line ; 

 the line straighter on the forewing than in P. trilineatus ; the proximal discal 

 line of the forewing obsolescent (for the greater part absent in our somewhat 

 abraded specimen) ; the corresponding line of the hind wing not accompanied by 

 a fuscous diffuse band on the outer side, as is generally the case in P. trilineatus ; 

 marginal area of both wings darker blackish grey than the proximal half of the 

 wings, of a dark hair-brown tint (Ridgway, Nomencl. Colours, pi. 3, No. 12). 



Genitalia quite different from those of P. trilineatus and dentatus. Tenth 

 tergite ending in a broader and more obtuse hook than in P. trilineatus ; the sternite 

 represented by a large plate, which is convex on the upperside and apically 

 sinuate, the two lobes separated from one another by the sinus are broad, rounded, 

 and slightly bent downwards. The clasper (text-fig. 1) is very much larger than 

 in P. trilineatus ; it is divided distally by a slit into a rather soft, scaled, upper 

 lobe and a more strongly chitinised, more or less naked, lower portion, of which 

 the apical margin is rounded, curving upwards and ending in a slender, apically 

 brown, process, which lies on the inner surface of the dorsal apical lobe. Below the 

 tenth sternite two spiniform processes, as in P. trilineatus, but straighter apically. 

 The penis-funnel a simple ovate ring. The impair ventral process of P. trilineatus 

 absent. 



2. Nyceryx eximia spec. nov. 



Nyceryx tacita, Rothschild & Jordan, Nov. Zool. ix. Suppl. p. 418. no. 351. pi. 47. fig. 2, pi. 53. 

 fig. 47, pi. 54. fig. 4 (1903) (partim ; Chiriqui). 



The specimens described in the Revision as tacita Druce are not this species. 

 We have now two examples of true tacita, the possession of which allows us to 

 compare the genitalia. The two species are certainly very similar both in colour 

 and structure, but perfectly distinct. 



In tacita the dark patch placed on the upperside of the forewing in front 

 of the hindmargin is sharply bounded on the proximal side by a straight grey line, 

 which is vestigial to the costa and ends here near the upper one of the two black 

 clots situated at the apex of the cell. In eximia, the forewing of which is rather 

 more purplish brown, this patch is posteriorly produced towards the base of the 

 wing, its inner edge being curved. The whitish grey lines on the forewing of 

 eximia are more irregular in shape than in tacita, the postdiscal line which runs 

 obliquely from the costa towards the distal margin particularly being straighter in 

 tacita than in eximia; the whitish grey submarginal curved line which extends 

 from the brown apical spot to the central tooth of the distal margin bears 

 in tacita a very distinct white dot, but not in eximia. The ochreons area of the 

 hindwing is much more extended in eximia than in tacita, the blackish brown 

 marginal border being 5 or 6 mm. wide at the subcostal in tacita, and at the most 

 3 mm. in eximia. 



The underside of the wings is almost the same in the two species ; tacita is 

 a little duller in tone and its marginal border contrasts slightly less with the 

 rest of the wing, in eximia a tooth projecting from the centre of the marginal 

 band on the forewing being especially deep brown. 



The whitish lateral dots on the abdomen are rather larger in eximia than in 

 tacita, while in tacita the first two abdominal sternites are more densely scaled 

 with purplish white, contrasting rather strongly with the other segments. 



The genitalia of the <$ of eximia are figured in the Revision, I.e. The 



