GENUS CASTNIA AND SOME ALLIED GROUPS. 201 



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

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

 wings being of a remarkable form in the latter sex. 



I[ab. Swan River, Nov. Holl. [Diggles). In Mus. Britann., Hopeiano Oxoniae. 



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. 



Hr. Boisduvars species of Orthia, O. augias and O. nexa, must be referred to the 

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

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

 Prom JEgocera they are distinguished by their geographical distribution being con- 

 fined to Soiith America. 



In 0. aiigias (Plate XXIX. figs. 18, 19) the fore wings have a small postcostal ceU, 

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

 cellular vein or, rather, fold. 



1. Othma auoias. " Ailes noires sans aucun reflet ; les ailes superieures, dont les 



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

 la cote k 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^. 



Ortkia auffias (Boisduval, MS.), Herr.-ScIiafFer, Aussereiir. Schmett. f. 18; Boisduval, H. n. L^p. Het. 

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



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

 In Mus, Hopeiano Oxonise, Boisduval. 



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



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

 augias. Les ailes superieures sont traversees, du milieu de la c6te a Tangle interne, 

 par unebande d'un jaune d'ocre tres-pale unpeu recourbee a son extremite comme 

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

 une variete femelle d.'augias. EUe ne differe que par la bande des ailes superieures 

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

 et par le dessous des ailes superieures dont la c6te est piquee de gris." 



Sab. ? In Mus. Boisduval. 



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



