96 Mv. A. G. Butler on the 



Streptostele simplex. 



Testa subulata, tenuis, imperforata, cereo-alba ; anfractus 9, apicales 

 Iseves, cajteri convexiusculi, sutura obliqua profunda discreti, lon- 

 gitudinaliter confertim striati ; apex obtusus, globosus ; apertura 

 parva, longit. totius 5 vix isquans, subquadrata ; perist. baud 

 incrassatum, antice leviter expansum ; columella subrecta, reflexa. 



Longit. 8| millim., diam. 2 ; apertura 2 longa. 



This species has rather convex whorls, is finely striated, 

 and has a deepish suture. The outer lip is scarcely thick- 

 ened and does not exhibit the sinus at the upper part which 

 is characteristic of the genus. In form and general appear- 

 ance, however, it agrees very well with the type of the group, 

 S. fastigiata, Morelet. It also bears some resemblance to S. 

 Buchholzioi Martens, from the Cameroons, but is considerably 

 smaller, and has shorter and rather more convex whorls. 



VIII. — Notes on the Genus Dyschorista, Led.^ a small Group 

 of Moths allied to Orthosia. By A. G. Butler. 



The genus Dyschorista was founded for the reception of two 

 European species, D. suspecta, Hiibn., and D. i/psilon=Jissi- 

 puncta, Hew. (see Lederer, Noct. p. 143, gen. 82). 



Accepting D. suspecta as type of the genus, it will be neces- 

 sary to include the bulk of the forms referred by M. Guenee 

 to his previously characterized genus Orthodes. 



Orthodes, Guenee, was described in the first volume of the 

 ' Noctuelites,' p. 371, no type being indicated; but Guenee 

 selected two of the species, 0. t-nigrum and 0. curvirena 

 (both Brazilian), for illustration. In the description of the 

 species of his second group Guenee pointed out that 0. cur- 

 virena differed structurally from the remainder of the genus: — 

 "L'une d'elles [Curvirena) a les palpes particuli^rement 

 ascendants et allonges." He thus restricted the identification 

 of his type to 0. t-nigrum^ the first species of his first group. 



In the Museum collection we have an example of 0. t-ni- 

 grum^ and, as may be seen from the figure in the ' Noc- 

 tueiites,' it has no connexion whatever with the remainder of 

 the species, but is in fact far more closely allied to Leucania; 

 fortunately the remaining species correspond with D. suspecta 

 in size, pattern, coloration, the ascending palpi, simple an- 

 tennjB, and heavily tufted anal decorations of the male. 



In his ' Check-list of North-American Moths ' for 1882 

 Grote rightly reduced the number of M. Guenee's North- 

 American species, Orthodes nimia and candens being sunk as 



