68 BULLETIN 44, UNITED STATES NATIONAL MUSEUM. 



In both the Graef and Neumoegeii collections there are specimens 

 marked teimescens Morr., type. These can not well have served as the 

 types for the description of tenuicola, and are related to simplaria and 

 Ancivis rather than conflua. I have adopted Mr. Morrison's name for 

 the specimens so labeled. 



Genus PERIDROMA Hbn. 

 1816. Hbu., Verzeiclmiss, 227. 



P. occulta Linn.* 



1767. Linn., Syst. Nat., iv, 514, Noclua. 

 1816. Hbn., Verzeiclmiss, 218, Enrols. 

 1852. Gn v Sp. Gen., Noct., ir, 76, Aplecta. 

 1857. Wlk., C. B. Mu's., Het., xi, 551, Enrols. 



1874. Grt., Can. Ent., vi, 13, 70, Eurois. 



1876. Speyer, .Stett. Ent. Zeit., xxxvi, 204, Aplecta. 



docilis Grt. 



1883. Grt., Bull. Geol. Surv., vi., 259, Agrotis. 

 1890. Smith, Bull. U. S. Nat. Mus., No. 38, 143, = per excellent. 



HABITAT. Northern and Eastern States; Canada; Colorado, Glen- 

 wood Springs in October; British Columbia; Massachusetts in June; 

 Canada, New York and Illinois in August. 



In the British Museum is a specimen marked docilis Grt. type, 

 which is without any doubt a form of occulta. It is from Snow, Colo- 

 rado, No. 894, and is entirely different from the specimen marked 

 docilis in the Edwards collection. From the description and Mr. Grote's 

 remarks on the species, I am persuaded that a form of perexcellens was 

 really what Mr. Grote intended to describe and that Mr. Edwards's 

 specimen represents the form to which the name should have been 

 attached. The small specimen of occulta, similar in color, probably 

 escaped notice among the other specimens and received the type label. 

 It makes no practical difference which specimen is accepted as type, 

 since in either case the name goes into the synonymy. 



P. preefixa Morr. 



1875. Morr., Proc. Bost. Soc. N. H., xvni, 117, Ayrolis. 



HABITAT. Eocky Mountains. 



The type is in the collection of Mr. Julius Meyer. 



P. astricta Morr.* 



1874. Morr., Proc. Bost. Soc. N. H., xvu, 135, Eurois. 



HABITAT. New York in July; New Hampshire and Northern States; 

 Canada; Colorado. 

 The type is in the National Museum. 



