166 RHOPALOCERA. 



any other part ; but with widely margined individuals others with scarcely any margin at 

 all occur, and every intermediate link between these extremes is represented. 



Of the names that have been applied to this insect T. tenella of Boisduval seems the 

 most applicable, and was based on a Brazilian insect; we have compared a male from 

 Minas Geraes in Brazil with another from the Mexican State of Guerrero and find them 

 absolutely alike. The same species has no doubt been frequently called T. nise of 

 Cramer ; but this name, based upon a female example said to have come from Jamaica, 

 has been so variously applied by different writers as to be practically unintelligible, and 

 for this reason we discontinue its use altogether. 



T. nisella appears to us, from a specimen compared with the type, to have been based 

 upon a female of T. tenella. T. nelphe of Felder applies to an insect of Eastern Mexico, 

 which offers no practical difference from the typical form. Of T. venustula we have a 

 specimen compared with Dr. Staudinger's type from Chiriqui ; it seems to us to agree 

 with average examples of the ordinary form of T. tenella. T. circumeincta of Bates, of 

 which the types are before us, are of rather a richer yellow than the majority of our 

 specimens, but we cannot think this difference important. The specimens called 

 T. stygmula by Messrs. Butler and Druce appear to us to be small females of 

 T. tenella. 



T. tenella is an excessively common insect, being found (except in the more northern 

 districts) throughout our region from the sea-level to an altitude of upwards of 5000 

 feet. In Mexico it probably flies throughout the year, but is perhaps most common in 

 the wet season, from May to October. 



b'". Wings white. 



15. Terias albula. 



Papilio albula, Cram. Pap. Ex. t. 27. f. E 1 . 



Terias sinoe, Butl. P. Z. S. 1871, p. 530 2 ; Butl. & Druce, P. Z. S. 1874, p. 359*. 



Terias sinoe, var. A, Boisd. Sp. Gen. p. 683 \ 



Terias marginella, Feld. Wien. ent. Mon. v. p. 97 5 ; Butl. P. Z. S. 1871, p. 530 6 . 



Terias albula, var. marginella, Butl. & Druce, P. Z. S. 1874, p. 359 \ 



Terias celata, R. Feld. Verh. zool.-bot. Ges. Wien, 1869, p. 466 8 . 



Terias leucilla, R. Feld. Verh. zool.-bot. Ges. Wien, 1869, p. 466 9 . 



Alis albis, apice et margine externo late fuscis, illo angulum analem versus decrescente et interdum non 

 attingente ; posticis interdum ad apicem fusco marginatis : subtus albis, basin versus flavo tinctis, interdum 

 apice et posticis omnino quoque flavescentibus, his maculis indistinctis notatis. 



Hab. Mexico, Cordova (Burnett), Atoyac (H. H. Smith), Vera Cruz (F. D. G.), Oaxaca 

 (Fenochio), Frontera, Teapa (H. H. Smith), Valladolid in Yucatan (G. F. Gaumer); 

 Beitish Hondueas, Corosal (Boe) ; Guatemala, Choctum, Polochic and Motagua valleys, 

 Pacific coast (F. I). G. & 0. S.), Panima, Zapote (Champion); Hcwdueas, Kuatan 

 Island (G. F. Gaumer), San Pedro ( Wh itely) ; Nicaeagua, Chontales (Belt, Janson); 



