568 BHOPALOCERA. 



in the male, these two insects also having the genitalia very similarly formed in this 

 sex ; but in M. perigenes, which we provisionally place here, the primaries are without 

 a brand, the neuration is slightly different, and the genitalia are dissimilar in form. 

 All three of them have the wings of a uniform fuscous colour above, with the cilia 

 more or less pale. The antennae have a somewhat stouter antenual club than in most 

 of the similarly coloured allied insects. 



The antenna? are about half the length of the costa, and have an elongate, moderately 

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

 and bluntly conical. The primaries have the costa arched at the base; the cell is 

 nearly two-thirds the length of the costa ; the discocellulars are strongly oblique, the 

 upper one twice the length of the lower, the latter a little shorter than the third 

 median segment ; the lower radial is strongly depressed at the base ; the first branch 

 arises slightly beyond the middle of the median nervure, the second at some little 

 distance before the lower angle of the cell. The secondaries are slightly lobed at the 

 anal angle ; the discocellulars are very faint. The body is rather slender. The middle 

 tibia? are conspicuously spined ; the hind tibiae have two pairs of spurs. The primaries 

 of the male (Tab. C. fig. 34) have a narrow oblique brand, extending from the base of 

 the second median branch to the middle of the submedian nervure, this being much 

 interrupted in M. anulis and absent in M. periqenes. 



a. Primaries of the male with a faint brand. 



1. Mastor anubis, s P . n. (Tab. c. figg. 32-35, <s .) 



Alis brunneo-fuscis, unicoloribus, stigmate concolore : subtus ut supra, palpis pilis aureis et fuscis iuterinixfcis 



vestitis ; antennis subtus ad clavae basin et ciliis externe ochraceis. 

 2 mari similis. 



Hab. Mexico, Omilteme in Guerrero (H. H. Smith), Orizaba (H. J. fflwes), Jalapa 

 (coll. Schaus). 



Our collection contains eighteen specimens of this obscure species. In some 

 examples a curved row of small spots is distinctly visible on the underside of the 

 secondaries, these being formed by scattered ochreous scales. M. anubis closely 

 resembles Cobalus chrysophrys, Mab., from Colombia, from which it differs in its larger 

 size, shorter antennae, and the very differently shaped brand in the male. We also 

 have an imperfect example from Costa Rica that may belong here. 



For the genitalia of the male, see Tab. C. fig. 35. 



2. Mastor bellus. (Tab. c. fig. 36, 6 .) 



Hesperia bellus, W. H. Edwards, Papilio, iv. p. 57 (J) (1884) \ 

 Pamphila bellus, Skinner, Ent. News, xi. p. 414, t. 2. ff. 11, 12 2 . 



Alis brunneo-fuscis, stigmate concolore : subtus ut supra, capite et palpis pilis ochreis vestitis • ciliis (nisi ad 



apicem posticarum) ocbraceis. ' 



2 mari similis. 



