328 PROCEEDINGS OF THE ACADEMY OF 



July 6. 



The President, Dr. Ruschenberger, in the chair. 



Thirteen members present. 



A paper entitled " Descriptions of new Species of American Land 

 and Fresh-water Shells," by Jas. Lewis, M.D., was presented for 

 publication. 



On Orthosia ferrugineoides. The Secretary read the following 

 communication from A. R. Grote : 



Mr. Morrison gives the synonymy of Orthosia ferrugineoides 

 on page 66 of the Proceedings of the Academy of Natural Sciences 

 of Philadelphia, I think quite incorrectly. Whether bicolorago, 

 Guen., is this same species or not seems doubtful. On the other 

 hand, spurcata, Walk., is founded on blackish specimens. In the 

 British Museum, the ordinary ferrugineoides was determined as 

 bicolorago; hence in earlier papers I have spoken of the species 

 under this name. If they are the same, then bicolorago has priority 

 for the species. A name proposed for a variety cannot obtain 

 against a name proposed for a species. The most important 

 reference, that of the species to its proper genus, is incorrectly 

 omitted by Mr. Morrison. Orthosia ralla is, also, incorrectly 

 made synonymous. O. ralla is a smaller species with pellucid 

 yellowish, unclouded hind wings. The t. p. line is shaded and 

 dentate in ralla, dotted in ferrugineoides. The subterminal line 

 is represented by distinct interspaceal spots in ralla ; in its alby it 

 is linear, faint, shaded, of the usual undulate shape. The fine 

 wings are more angulate in ralla, and the under surface paler and 

 less notieeabby marked. The synonymy of ferrugineoides, until 

 we have more certainty as to what bicolorago is, will stand as fol- 

 lows: 



Orthosia ferrugineoides. 



Xanthia ferruginea var. ferrugineoides, Guen., Noct. i. 398. 



Xanthia bicolorago, Walk., C. B. M. Noct. 464. 



Orthosia ferrugimoides, Grote, Bull. Buff. Soc. Nat. Sci. 2, 124. 



var. spurcata, Walk., C. B. M. Noct. 749. 



? Xanthia bicolorago, Guen., Noct. i. 397. 



Hab. Eastern and Middle States and Canada. 



