MNASALCAS.— MASTOK. 567 



MNASALCAS, gen. nov. 



Pamphila uniformis, Butl., from Costa Rica, described from a single female example, 

 has a conspicuous and very peculiarly shaped brand on the primaries of the male, and 

 as it also differs in some other particulars from the species of all the allied genera we 

 are compelled to place it by itself. 



The antennae are about two-thirds the length of the costa, and have a rather stout 

 club, terminating in a long crook. The third joint of the palpi is very short, conical, 

 and almost concealed. The primaries are moderately elongate, blunt at the tip, and 

 have the costa arched at the base ; the cell is less than two-thirds the length of the 

 costa ; the discocellulars are oblique, the upper one being fully three times the length 

 of the lower, the latter about equal to the third median segment, which is very short ; 

 the lower radial is considerably depressed at the base ; the first branch arises a little 

 beyond the middle of the median nervure, the second almost at the lower angle of the 

 cell. The secondaries are rounded at the anal angle ; the discocellulars are faint. The 

 body is slender. The middle tibiae are without spines, and the hind tibiae have two 

 pairs of spurs. The primaries of the male (Tab. C. fig. 30) have the brand formed of 

 three portions: (1) a longitudinal streak extending along the second median segment 

 to beyond the base of the second branch and filling the angle between it and the first 

 branch ; (2) a short longitudinal streak immediately below this ; (3) a triangular piece 

 extending forwards from the middle of the submedian nervure. 



1. Mnasalcas uniformis. (Tab. C. figg. 30, 31, 6 .) 



Pamphila uniformis, Butl. Cist. Ent. i. p. 113 \ 



Alis nigro-fuscis, unicoloribus : subtus brunnescentioribus, anticis margine interno pallidioribus ; palpis pilis 



fuscis. 

 $ mari similis. 



Hab. Costa Rica (Van Patten 2 ), Cache, Irazu (Sogers). 



Dr. Butler's description of this insect was taken from a very worn specimen in 

 Van Patten's Costa-Bican collection, which is now in our possession, and with this we 

 associate four males from the same country. M. uniformis closely resembles numerous 

 other Tropical- American species, but the form of the brand in the male will distinguish 

 it from all its allies. For the genitalia of the male, see Tab. C. fig. 31. 



MASTOR, gen. nov. 



The species we refer to this genus have the primaries comparatively short, and rather 

 blunt at the tip, approaching in this respect Poanes and Poanopsis, from which they 

 differ in having a more slender club and a longer crook to the antennae, the primaries 

 less rounded at the apex, &c. In M. anubis, which we take as the type, and M. bellus 

 (W. H. Edwards) there is a slender, interrupted, linear, oblique brand on the primaries 



4n '1 



