77 



HABROSYNE, Hiibner (1816). 



Type : Noctua derasa, Linnaeus. 

 scripta. 



Thyatira scripta, Gosse. 



Thyatira abrasa, Guenee. 

 Canada ; New York ; Pennsylvania ; Virginia. 



THYATIRA, Ochsenheimer (1816). 



Type : Noctua Batis, Linnaeus. 

 pudens, Oueme. 

 New York ; Pennsylvania. 



The tribes I have adopted in the Moths are founded upon a more 

 intimate resemblance among groups of genera ; they may possibly 

 assist us in placing the different forms into a natural position. 



Dr. Packard has shown the existence of two Subfamily types in 

 the Noctuidae, cotrresponding in the main with M. Guenee's Trifi- 

 dae and Quadrifidae, but based on other and comparative characters. 

 Lederer had previously shown that M. Guenee's definitions are inex- 

 act, and had contended that the Noctuidae are not susceptible of 

 any Subfamily division. 



The species thrown together under Acronycta appear susceptible 

 of generic division, while our knowledge of the difficult forms is as 

 yet extremely defective. The early stages must be studied, since we 

 find the statements of authors that these differ widely in otherwise 

 closely allied species. I here indicate, I fear imperfectly, the difier- 

 ent groups into which it seems our species may be divided, not 

 changing the general generic designation, and leaving many ques- 

 tions for the moment unsolved. 



In 1868 we recorded our opinion of Mr. Walkers description of 

 American Moths, based upon our personal examination of the 

 British Museum collections. So many authorities concur in an 

 unfavorable opinion of Mr. Walker's labors, that we need no excuse 

 for omitting here any reference to the British Museum Catalogue, 

 except where we have identified Mr. Walker's descriptions. 



