l.S< 



XIII. On Certain Species of Black-winged Catocala 



BY AUG. R. GROTE, 

 [Read before this Sjcidy, Feb. 2, 1877.] 



I HAVE recently' arnmged tlie difrerent North American forms 

 with black secondaries, belonging to the genus Calocala, into two 

 sub-groups, characterized by the fringes to the hindwingg being 

 dusky and blackish, or white. There is a great similarity between 

 several of the black-winged species in either group. In the group 

 with white fringes we have C. desperata, C. refccta and C. Jlehilis, 

 as an example of very nearly allied forms. In the black-fringed 

 grouji we have C. i/isolabilis, C. residua and C. Angusi, exhibiting 

 a parallel relationship. I have attempted a photographic represen- 

 tation on the accompanying Plate V of these three latter species, of 

 which specimens of both sexes are contained in the collection of 

 this Society. 



C. insolahilis- differs from the two allied species in the blue-gray 

 tint of the thorax and forewings, especially of the median space- 

 The internal margin is more or less suffused with blackish before 

 the transverse anterior, and behind the transverse posterior line. 

 Here the scales are slightly metallic as in C. iamibcus. At apices 

 the fringe is usually flecked with Avhitc. The reniform is reduced 

 in size. Beneath, the white median band is more obsolete or nar- 

 rower and deeply tinged with bluish. The body parts are more 

 white below, and Ave are a little reminded of C. cpione. 



C. residua' is characterized by the pccnliar dusky or smoky tinge 

 of the primaries, from the base to the gi'ay subterminal shade ; the 

 thorax being of the same hue. A similar smoky color is shown by 

 C. obscura, and C. simulatilis, which belong to the white-fringed 

 sub-group, and C. serena, which belongs to the ycIlow-Avinged 

 group. There is a black shade op})osite the cell beyond and edging 



' Can. Ent. 8, 230, Dec. 1876. 



2Giieii. Sp. Gen. 7, 94. 



^Giote, Proc. Bost. Soc. N. Uit^t. xvi, ^l-i. 



