66 PROCEEDINGS OF THE ACADEMY OF 



Hub. Jacksonville, Fla. 



This species can at once be separated from its well-known con- 

 genor by the form of the posterior wings. 



Orthosia ferrugineoides, Quen. 



" Species General," vol. v. p. 398, 1852. 



Xanthia valla, G. & R., Trans. Amer. Ent. Soc, vol. i. p. 346, pi. 7> 



fig. 49. 

 Xanthia bicolorago, Guen. vol. v. p. 397, 1852. 



We have recently seen specimens determined as X. ralla, G. & R. ; 

 this confirms our previous opinion (formed from the figure and 

 description) that it was a redescription of the common 0. ferru- 

 gineoides, Guen. 



The figure given by Grote and Robinson represents the form in 

 which the ground color is light-yellow and the markings fine and 

 interrupted ; it is of common occurrence. The form which we 

 think M. Guenee has described under the name of bicolorago, has, 

 on the contrary, the ground color of a darker obscure yellow and 

 all the markings very heavy and black, particularly the median 

 shade ; the terminal and the outer part of the subterminal spaces 

 ai'e also entirely black, and the posterior wings are crossed by two 

 distinct median lines. 



We have seen specimens in the Museum of Comparative Zoolo- 

 gy at Cambridge, in which the whole surface of the anterior wings 

 is overspread with black ; these we would also refer to this variety. 



Our American species is certainly very near to the European 

 0. circellaris, but we have compared a considerable series of them 

 both and find that there are slight but constant differences, enough 

 we think to entitle them to separate designations. 



Orthosia perpura, nov. sp. 



Expanse 31 mm. Length of body 15 mm. 



Eye naked, with lashes. Palpi with the third joint short and 

 stunted. Antennae of the male p3 r ramidal-toothed. Front and 

 thorax concolorous with the anterior wings. Abdomen short and 

 untufted. 



Anterior wings gra} r , overspread in parts with a peculiar bluish 

 cinereous color; all the markings present, although not very well 

 defined ; half-line present; interior line indistinct, from its central 

 lobe proceeds the brown evident claviform spot ; the ordinary 

 spots are close together, brown encircled, concolorous, and of 

 nearly equal size ; the median shade obsolete and the median 



