Vol. xh, 



PROCEEDINGS OF THE NATIONAL MUSEUM. 491 



vestiture is entirely hairy or at least with but a few capitate hairs inter- 

 mixed. 



Normalis heads the list in the first group, and is our largest species. 

 It lacks all tnaculation save the pale, deep black ringed, ordinary spots, 

 and is thus readily recognized. The genitalia are unique. 



Inferior is a small species of a dull ash-gray color, densely irrorate 

 with black scales; the ordinary spots are barely defined and hardly 

 paler in ground color. 



Plusiiformis is a handsome species, larger than the preceding and 

 paler ash gray in color. The ordinary spots are distinctly outliued 

 and the s. t. line is marked. In genital structure this species agrees in 

 essential characters with inferior and muricina, the peculiar feature 

 being a broad corneous plate, which at tip is emarginate, the projecting 

 edges variably curved to form the clasper. 



Muricina aud Behrensiana differ from all the preceding by having the 

 terminal space much paler than the other portions of the wing. The 

 former is a pale, grayish brown, the Hues obsolete or indistinct. The 

 latter, which is unknown to me in nature, is said to be dark brown, 

 coarsely irrorate with black, costal margin carneous, transverse lines 

 distinct, pale. 



The remaining species belong to the second group in which the ordi- 

 nary spots are not confluent. 



Pulchella is very readily recognized by the deep red brown ground 

 color, aud the pale, blue gray terminal space. The transverse lines, so 

 far as traceable, are also pale. 



Erytlirolita and transparens differ in not having the terminal space 

 paler, or discolorous. The former is variable in grountTcolor, and has 

 the s. t. line well marked, though not continuous. Transparens is a 

 dull red brown, with the s. t. line wanting and all ornamentation sub- 

 obsolete. 



Per. prccses Grt. seems to me better referred as a Tamiocampa. 



The species are Western and seem not common usually. 



A more comprehensive division of the genus is as follows : 

 Ordinary spots couflueut, large, pale. Vestiture with scales or capitate hairs inter- 

 mixed. 



S. t. space concolorous. 

 Dark fuscous brown; all lines wanting; ordinary spots, pale ringed, black shaded. 



NORMALIS 



Ash gray, dark, uniform, maculation obsolete inferior 



Paler, with a rufous tint ; s. t. line marked, ordinary spots outliued. 



TLUSIIFORMIS 



S. t. space paler. 



Pale gray-brown; transverse liues obsolete muricina 



Dark brown, coarsely irrorate with black, costal margin carneous.. reiirexsiaxa 

 Ordinary spots normal, not confluent; vestiture hairy. 



Terminal space discolorous, pale. 

 Deep red-brown ; transverse liues and terminal space bluish gray.. ..itlchella 



Terminal space concolorous. 



Mouse-gray to leather-brown ; s. t. liue marked erytiirolita 



Dull red-brown. S. t. line obsolete TRAXsr-ARENS 



