68 BULLETIN 44, UNITEi:) STATES NATIONAL MUSEUM. 



In both tlic Graef and NeuiMoegon collections there are specimens 

 marked tenuescens INIorr., type. These can not well have served as the 

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

 incivis rather than confiua. I have adoiited Mr. Morrison's name for 

 the specimens so labeled. 



Genus PERIDROMA Hbn. 



1816. Hbn., Verzeicliniss, 227. 



P. occulta Liun.* 



1767. Linn., Syst. Nat., iv, ^\i,Noctua. 

 1816. Hbn., Verzeicliniss, 218, Eurois. 

 1852. Gn., Sp. Gen., Noct., ii, 76, Aplecta. 

 1857. Wlk., C. B. Mus., Het., xi, 551, Earois. 



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



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



docilis Grt. 

 1883. Grt., Bull. Geol. Snrv., vi., 2.59, Ayrolis. 

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



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 difierent 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 perexccllens 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 si^ecimen of occulta, similar in color, probably 

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

 It makes no j)ractical difference which specimen is accepted as type, 

 since in either case the name goes into the synonymy. 



p. praefixa Moir. 



1875. MoiT., Proc. Bost. Soc. N. H., xviii, 117, Ayrotis. 



Habitat. — Rocky Mountains. 



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



p. astiicta Morr.* 



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

 Habitat. — New York in July; New Hampshire and Northern States; 

 Canada; Colorado. 

 The type is in the National Museum. 



