''^im" ] PROCEEDINGS OF THE NATIONAL MUSEUM. 227 



outer borders and pale fringes. Beneatb, powdery, markings of sec- 

 ondaries more or less distinctly reproduced. A variably distinct outer 

 line and discal spots. Head and thorax concolorous with primaries. 



Expands 30 to 37""" (1.20 to 1.48 inches). 



Habitat. — Europe and North America. 



The Museum series contains twelve specimens, and others are among 

 tliedui)licates. The localities are: Albany, New York, May IS, June 10, 

 August!), 12 (Meske,C. V. R.); Boston, Massachusetts (J. B. S.)-. District 

 of Columbia, May 22; Central Missouri, May 18, June 2 and 30 (C. V. 

 K.); Denver, Colorado, Bruce (Coll. U. S.N. M.); New Jersey, Iowa, 

 northern Illinois, Arizona. 



A widely distributed and very common species, which is readily rec- 

 ognized by the large reniform, which isinferiorly darkish, as well as by 

 the usually gray luleous color of primaries. It can not be confused with 

 any other of the species with prominent W-mark to s. t. line. 



The type form is rather pale luteous, very strongly frosted or powdered 

 with gray; the maculation is all present, but is obscure and not con- 

 trasting. This is the common eastern form. 



Marmorosa is applied to an even luteous form with very distinct macu- 

 lation, the black dashes prec^ling s. t. line being especially prominent. 

 It is a European form and occurs again in Arizona. I have not seen it 

 from any eastern locality. 



Orccjonica is densely powdered with fuscous, tiie markings hardly re- 

 lieved; secondaries distinctly yellow tinged. This is from Mt. Hood 

 and may be like microdon Gn., which Staudinger cites as an aberratic 

 variety from the Alps and (?) Labrador, and of which he says " multo 

 obscurior." 



The genitalia of the male are very strongly marked. The hari)es are 

 iiHMubranous, broad at base, suddenly and strongly constricted into a 

 narrow, short, curved neck, whicli dilates at tip into a rounded, con- 

 cave lappet, fringed inwardly with a row of spinules. The clasper is 

 very stout, chitinous, and of an almost indescribable form. A reference 

 to the tigure must serve in lieu of words. 



This insect is of economic importance and the life history has been 

 written in economic publications by Dr. Kiley and others. 1 have not 

 included these economic references, nor have I made any attempts at 

 giving the European bibliography. 



Group VINDEMIALIS. 



The species here associated agree in color and general habitus only, 

 and the group is easily characterized as consisting of rather large red 

 or blackish-brown species wliicli do not by structural peculiarities 

 belong to other groui)s. 



They are all rather robust in build, with moderately large wings, 

 rather rouglily clothed and indistinctly tufted thorax, and more or less 

 incomi)lete maculation. The species are easily distinguished. 



