TEEIAS. 169 



18. Terias cepio, sp. n. (Tab. LXIV. figg. 5, 6 6 , 7, 8 $ .) 



Terias delta, Butl. P. Z. S. 1871, p. 533 (partim) 1 . 



d alis sulphureis ciliis albicantibus, anticis limbo costali fusco atomato, apice late fusco introrsum arcuato, 

 angulum analem versus sinuato, ante angulum analem ipsum abbreviate, vitta margini interno parallela 

 fusca cano pilosa, margine interno infra earn aurantio ; posticis plaga magna subtriangulari ad angulum 

 apicalem, punctis quibusdam ad marginem externum fuscis : subtus ochraceo-gilvis, anticis interne 

 sulphureis, posticis undique fusco atomatis, maculis irregularibus discalibus fuscescentibus. 



$ mari similis, sed alis supra vitta interna fusca nulla et subtus parte gilva rufescentiore. 



Hob. Mexico, Mazatlan (G. F. Mathew), Presidio (A. Forrer), Acapulco (A. H. 

 Markham), Tepetlapa, Cuernavaca (II. H. Smith), Patzcuaro (F. I). G.), Puebla, 

 Orizaba (E. J. Elwes), Cordova (Bumeli), Atoyac (II. II. Smith). 



We have described and figured a male and female captured in October, 1888, by 

 Mr. H. H. Smith at Tepetlapa, in the State of Guerrero, at an altitude of 3000 feet 

 above the sea. As a rule T. cepio may be distinguished by the bright yellow colour of 

 its wings on the upperside, and by the rufescent tint of the secondaries beneath, espe- 

 cially those of the females ; these characters are more strongly shown in specimens from 

 Western Mexico than they are in those from the eastern side of the Cordillera, where 

 some intermediate forms occur leading to T. persistens. The nearest ally, however, to 

 this form is T. delta of the Eastern States of North America. T. delia, however, may 

 be readily distinguished by its rufous fringe to the wings, and the deep ferruginous tint 

 of the secondaries beneath. T. cepio enjoys a wide range in altitude, occurring at the 

 sea-level at Mazatlan, and as high as 7000 feet at Puebla. It appears to occur all the 

 year round, but is more abundant in the wet season. 



19. Terias sidonia. (Tab. LXIII. figg. 16, 17 s , 18, 19 $ .) 



Terias sidonia, R. Feld. Verh. zool.-bot. Ges. Wien, p. 465 1 i Butl. P. Z. S. 1871, p. 532 \ 



3 alis sulphureis, anticis limbo costali fusco plus minusve flavo atomato, apice late fusco introrsum arcuato, ad 

 angulum analem trisinuato, vitta interna fusca cano pilosa, margine interno infra earn aurantio ; posticis 

 late fusco marginatis, interdum undique fusco atomatis : subtus sericeo-albis, immaculatis. 



$ mari similis, sed alis sordide albo nee flavo tinctis, et undique fusco atomatis. 



Hab. Mexico 2 , Ventanas in Durango (Forrer), Acapulco (J. J. Walker, A.H. MarJcham, 

 H. II. Smith), Eio Papagaio, Rincon, Tierra Colorada, Acaguizotla, Dos Arroyos, Venta 

 de Zopilote, Hacienda de la Imagen, La Venta, Tepetlapa, Xucumanatlan, Chilpancingo, 

 Amula, all in the State of Guerrero (H. H. Smith), Cuernavaca (mus. Felder l & H. H. 

 Smith), Oaxaca (Fenochio), Cordova (Humeli), Orizaba (F. D. O.), Teapa in Tabasco 

 (H. H. Smith), Campeche (mus. Felder), Valladolid in Yucatan (Gaumer). 



We have described and figured a pair taken together by Mr. H. H. Smith at Acapulco 

 in September 1888 ; these agree sufficiently with a specimen from Oaxaca compared 

 with Felder's type. The species is a very variable one, especially as regards the width 

 and definition of the marginal border of the secondaries in the male, and the extent 



biol. cente.-amee., Rhopal., Vol. II., November 1889. z 



