458 RHOPALOCEKA. 



long and stout, and obliquely truncate at the end, it is armed on the upper edge at the 

 base with a sharp tooth ; the left harpe has its distal portion moderately long and 

 abruptly narrowed from about the middle, it is furnished on the upper edge at the apex 

 with some sharp teeth, and at the base of the distal portion it has a short longitudinal 

 lobe serrated on its upper edge. (See Tab. XCI. fig. 18.) 



4. Thanaos pacuvius. (Tab. XCI. figg. 16, 17 <s .) 



Nisoniades pacuvius, Lintner, Thirtieth Rep. State Mas. N. Y. p. 172 (1877) \ 



T. fanerali quoad colores alarum similis, sed minor, et alis forsan grisescentioribus, posticis ciliis albis ad 

 apicem baud extendentibus, structura maris partium genitalium omnino differt. 



Bob, North America, New Mexico 1 . — Mexico, Northern Sonora {Morrison), Bolanos 

 in Jalisco {Richardson), Omilteme, Xucumanatlan {H. H. Smith). 



We refer nine specimens in our collection from Northern, and six from Western 

 Mexico somewhat doubtfully to this species. It was described by Lintner from a 

 single male example from New Mexico, some years later than the publication of 

 Scudder and Burgess's paper. The male genitalia are quite different in form from those 

 of any species of the genus figured by these last-mentioned authors. 



T. pacuvius is smaller than T.funeralis, and has the primaries less pointed and the 

 white fringe of the secondaries barely reaching to the apex. 



Three males have been dissected. 



The tegumen terminates in two short hooks : the right harpe is long, tapering, and 

 ciliate ; the left harpe is shorter than the right and bears very long fine hairs towards 

 its end, it is rounded at the apex and on its upper edge has an erect dentate lobe some 

 distance before the end. (See Tab. XCI. fig. 17.) 



5. Thanaos albomarginatus, sp. n. (Tab. XCI. figg. 19, 20, 21 s ; 22, 



23 ? .) 



Nisoniades tristis, Staud. Ex. Schmett. p. 302, t. 100 l (nee Boisd.). 



T. funerali quoque similis, sed posticis subtus albo-marginatis et ciliis albis longioribus facile distinguendus. 



Hab. Mexico, Cordova {Rumeli) ; Guatemala 1 , Chisoy Valley {F. D. G. & 0. S.), 

 San Geronimo {Champion, F. J). G. & 0. S.) ; Costa Rica {Van Patten), Irazu {Rogers) ; 

 Panama, Chiriqui 1 {ex Staudinger), Volcan de Chiriqui {Arce). — Colombia 1 . 



T. albomarginatus is distinguished from all the other Central-American species of 

 this genus by the white fringe of the secondaries being broader and not extending to 

 the apex, the outer margin also of the secondaries beneath is white. 



We have examined the genitalia of four male specimens : the right harpe has the 

 distal portion stout, moderately long, and obliquely truncate at the end ; the left harpe 

 has the distal half long and narrow, slightly tapering at the tip, and from its base 

 arises a short curved dentate process. (See Tab. XCI. fig. 21.) 



