ABAGROTIS BIMARGI'NALIS, Grt. 



1883. Grt. Ann. & Mag., N. H., XI, Fifth Series, (London), 53, AgroUs. 



1883. Grt., Trans. Kans. Ac. Sci., VIII (1881-2), 54 (Reprint) Agrotis. 



1890. Sm., BiiU. U. S. N. M., XXXVIII, 26 Bhynchagrotis. 



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



1903. Hamp., Cat. Lep. Phal. B. M., IV, 634, pi. LXXVII, fig. 6, THp/iae«a. 



Ifi08. Sm., Can. Ent., XL, 223, Rhynchagrotis. 



AGROTIS BIMARGINALIS, n. s. 



Allied to variata and observabilis. Head and thorax rich orange- 

 brown; a broad pale leather-brown or fawn-coloured costal stripe to termi- 

 nal posterior line; terminal sjjace frosted with white. Rest of the wing 

 deep brown, shaded with black. Terminal j^osterior line even; stigmata 

 obscured by the blackish shading; subterminal space black on costa. Hind 

 wings pale fuscous; abdomen brownish terminally. Beneath with dots 

 and a common even exterior shade band. No. 924. Expanse 36 ■"'". 



Type Locality: Gallinas Canon, Las N'egas, New Mexico. 



NuBiBER Axi) Ssx OF Types : 1 5? Neumoegen Collection; 1 2, Snow 

 Collection. 



Types ix: Neumoegen and Snow Collections. 



Specimens Examined: 1 $, Jemez Springs, N. Mex; 1 $, comj^ared 

 with type, Redington, Ariz, (in the Barnes Collection); I9, compared 

 with type in Brooklyn Museum, hj Messrs. Doll and Engelhardt (in the 

 Neumoegen Collection). 



Gexitalic Slides: 1, $ , Jemez Springs, N. M. 



This is apparently a rare species, as Dr. Smith had no speci- 

 mens, and the Barnes Collection only possesses two males. 



It is easily separated from all species of tlie genus Lampra by 

 its buff costa, except for an occasional specimen of vittifrons. Only 

 the females can be confused as the male of bimarginalis has ser- 

 rate antennae, which places it in the subgenus Abagrotis. The 

 serrations are between those of erratica and alcandola in size. 

 Toward the tip, the antennae appear lamellate ; the serrations and 

 lamellations reaching about three-fourths of the length of the shaft. 

 The occasional female that may be confused with vittifrons can 

 easily be distinguished by its larger size; about one and one-half 

 inches, as against one and one-quarter inches for the largest vitti- 

 frons. The more obscure maculation, the collar not concolorous 

 with the costal margin of the primaries and the fuscous secondaries 

 are additional .characters, by which bimarginalis differs from the 

 more definite maculation, collar and costal margin concolorous, and 

 pearly white secondaries (with only the veins and margins fiiscous) 

 of vittifrons. '^ " 



Genitalically the two are quite distinct ;btTt similar in general 

 appearance. 



81 



