A REVISION OF THE DELTOID MOTHS — SMITH. 103 



to smoky black; in the female often with a vague discal luunle, in the 

 male imiuaculate. lieneath, ashen to smoky, with a iiior<' or less 

 marked outer line and discal liinule ou all wiiifjs. 



Expanse of wings, '-'4 to 32 mm.=0.*.>5 to I..'{() inches. 



Habitat. — Canada to Texas; Central States; South Dakota; Dela- 

 ware in June. 



Of the s])ecinions before me from the United States National Museum, 

 one is marked No. 1*841, Sept. Oth, 'Si*, and this is an undersized female, 

 expanding 1*4 mm., or less than an inch. Few specimens expand less 

 than 28 mm., and .'50 mm. is about a fair average expanse. This expla- 

 nation is made in view of the fact that />. sordidiiUi resembles this 

 species in the female so nearly that errors are possible, and size is an 

 im])ortant factor m distinction. A se(!ond specimen from the National 

 Museum is marked ''Larva on Walnut, i)Ui)ated Aug. 12, \S3. Issued 

 April 16, '84." This specimen is a full sized male. The sexual differ- 

 ences in this species are strongly marked, tlie dark, robust, broad- 

 winged male bearing little resemblance to the lighter, more frail female. 

 To Mr. Butler belongs the credit of pointing out this relationship, which 

 had not been theretofore suspected. We have in the male, which is 

 best known as Hypena profecta, the most robust of our species and the 

 broadest winged. It is a common species locally. 



Bomolocha sordidula, (irotc. 



1872. Grf)te, Trans. Am. l^utoinological Soc, IV, \0?>, Hj/poia. 

 1876. Grote, Check List Xoctaidit', 45, liomoJocha <i~ Kithijpena. 



''Male. — Size and color and form of H. tormta. Sooty black, pow 

 dered with gray scales. The ordinary lines are faintly apparent, nearly 

 l)erpendicular, brought into relief by i)ale powderings, waved or undu- 

 late. Transverse posterior line usually marked by pale scales on costa. 

 Several anteapical minute pale costal dots. Fringes interrui)ted with 

 whitish on both wings, short. Secondaries deej) blackislu with discal 

 dots apparent. Beneath i^aler, dusted with pale scales, without mark- 

 itigs. except terminal lines as on upper surface, and discal marks." 



The above original characterization apj)lies fairly well, and it need 

 only be added that while some specimens become almost immaculate, 

 with a bronze glistening reflection, others have the transverse posterior 

 line traceable, and in such cases it is as in the female, which has not 

 been described. 



Female. — (rround color, dirty luteous brown. Head and thorax con 

 colorous, abdomen i)ale luteofuscous like secondaries. Primaries with 

 the median space a little <larker, a bluish gray shade following the 

 transverse posterior line and lost before reaching the subterminal line; 

 terminal space sometimes a little paler. Transverse anterior line (luite 

 remote from basis enlarging the basal space, which is sometimes a 

 little lighter in shade; brown, single, feebly marked, with two distinct 

 outcurves. Transverse posterior line pale, inwardly margined by a 



