HABROSYNE, Hiibner (1816). 
Type: Noctua derasa, Linnaeus. 
seripta. 
T hyatira scripta, Gosse. 
Thyatira abrasa, Guenée. 
Canada; New York; Pennsylvania; Virginia. 
THYATIRA, Ochsenheimer (1816). 
Type: Noctua Batis, Linnaeus. 
pudens, Guenée. ' 
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, corresponding in the main with M. Guenée’s Trifi- 
dae and Quadrifidae, but based on other and comparative characters. 
Lederer had previously shown that M. Guenée’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 differ- 
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. Walker’s 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. 
