GENUS CASTNIJ AND SOME ALLIED GROUPS. 201 



Obs. The typical specimen of this species, described by Mr. "Walker as a male, is a 

 female, wanting the vitreous spot of the fore wings, which exists in the true male, the 

 wings being of a remarkable form in the latter sex. 



Sab. Swan River, Nov. Holl. (Diggles). In Mus. Britann., Hopeiano Oxonise. 



The insects described in the remaining portion of this memoir have been regarded by 

 various authors as belonging to the group of which Castnia is the type — from which, 

 however, they are entirely distinct, belonging to other Heterocerous groups. 



Genus Othria, Westw. 



Dr. BoisduvaTs species of Ortlda, O. augias and O. nexa, must be referred to the 

 Agaristides, the veining of their wings agreeing exactly with that of Agarista. I propose 

 to place them therefore as a separate genus of Agaristides, under the name of Othria. 

 From JEgocera they are distinguished by tbeir geographical distribution being con- 

 fined to South America. 



In O. augias (Plate XXIX. figs. 18, 19) the fore wings have a small postcostal cell, 

 the branches b 2 and b 3 arising far beyond the cell, as does also b 5, whilst b 5* springs 

 from a little branch from the middle of the hinder margin of the postcostal cell, and the 

 discoidal cell of the hind wings is imperfectly closed by a very slender arched disco- 

 cellular vein or, rather, fold. 



1. Othria atjgtas. " Ailes noires sans aucun reflet ; les ailes superieures, dont les 



nervures forment des stries grisatres longitudinales sont traversees, du milieu de 

 la cote a, Tangle interne, par une bande d'un jaune d'ocre, tres-droite. Ailes infe- 

 rieures sans taches, avec les nervures un peu plus claires." Exp. alar. ant. unc. 2^. 



Orthia augias (Boisduval, MS.), Herr.-Schaffer, Aussereur. Schmett. f. 18; Boisduval, H. n. Le"p. Het. 

 p. 542 (incorrectly referred in his text, but with doubt, to Orthia pelasgus) . 



Sab. Brasilia (Bio Janeiro), Minas Geraes (Rogers), Brasilia occidentalis (Sogers). 

 In Mus, Hopeiano Oxoniae, Boisduval. 



2. Othria istexa. " Elle a le port et la taille de O. augias ; ses quatre ailes sont d'un 



noir terne, sans aucun reflet, avec T extremite des nervures grisatre comme chez 

 augias. Les ailes superieures sont traversees, du milieu de la cote a Tangle interne, 

 par une bande d'un jaune d'ocre tres-pale un peu recourbee a son extremite comme 

 dans pelasgus ; les ailes inferieures sont sans taches. Cette espece pourrait bien etre 

 une variete femelle d? augias. Elle ne differe que par la bande des ailes superieures 

 notablement plus pale, formant un tant soit peu le crochet a son extremite inferieure, 

 et par le dessous des ailes superieures dont la cote est piquee de gris." 



Sab. ? In Mus. Boisduval. 



Orthia nexa, Boisduval, H. n. Lep. Het. p. 543, 



