the following species to be separated genitalically : 



L. "placida," fiom f runty specimens of L. harnesi 



(about 20% without median ■< L. nefascia 

 shade) [ L. forbesi 



See discussion of the Nefascia Group which will reduce this still 

 further. 



Genitalic Key to Separate aberrant "PLACIDA" from 

 FORBESI, BARNESI and NEFASCIA 



I. — Penis with peculiar, conspicuous ridges besides the other 



armament Forbesi 



II. — Not so, — penis without conspicuous ridges, 



A. — Comb of penis modified into a huge plate with teeth 

 at the end and with a decided tendency to be project- 

 ing from the aedoegus barnesi 



B. — Not so, — (comb present or absent, seldom projecting, 

 never completely fitting characters given under A, 



a. — Sacculus large and lobate ; arm of valve slen- 

 der, so that when spread out the arm appears 

 as a mere crook beneath the sacculus, (comb of 

 penis present) nefascia 



b. — Not fitting this description, comb of penis either 



present or absent; very variable. "placida" 



GROUP VITTIFRONS 



This group contains a single sjDecies, vittifrons, Grt. 



The group is readily distinguished from all others in that the 

 costal margin of the primaries is creamy white, and in all speci- 

 mens examined almost concolorous with the collar. In addition 

 the thorax is without crest ; and the antennae of the male is finely 

 ciliated; with four longer cilia from each joint, all in the same 

 lateral plane. 



LAMPRA VITTIFRONS, Grt. 



1864. Grt., Proc. Ent. Soc. Phil., Ill, 527, pi. 5, f. 8, Noctua. 



1868. Grt., Trans. Am. Ent. Soc„ II, 309, Agrotis. 



1890. Sm., Bull U. S. N. M., XXXVIII, 26, Rhyncha gratis. 



1893. Sm., Bull. U. S. N. M., XLIV, 54, Rhynchagrotis. 



1895. Grt., Abh. Nat. Ver., Bremen, XIV, 18, Agrotis (Lampra). 



1903. Hamp., Cat. Lep. Phal. B. M., IV, 633, pi. LXXVII, f. 4, Triphaena. 



1908. Sm., Can. Ent, XL, 224, Rhynchagrotis. 



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