APPENDIX. 



Siiico tlio mamiseript of this revision was. handed in, only a few 

 months aj;o, a number of species ditferinj; from all previously de- 

 scribed have come into my hands, and these are for completeness 

 described here and inserted in their i)roper places in the list of species. 

 It has proved inexpedient to insert them in the body of the paper 

 without too much chaiiije in the text ; but I have in all cases in the 

 descriptions indicated the nearest allies, and dilferentiated the species 

 from those with which they most nearly resemble. 



Lar^e as is the assemblaii^e here, many undescribed forms ;ire still 

 in collections, and every sending from the far western States brings to 

 light new species. In the IT. S. National Museum are some species, 

 represented sometimes by one, sometimes even by several, bred speci- 

 mens which 1 couhl not place satisfactorily to myself and which are 

 therefore omitted. It is hoped that the present paper, by substituting 

 a natural arrangement for the confused mixture in Mr. Grote's lists, 

 will facilitate the proj^or determination of species in the collections. 



Agrotis aurulenta sp. tiov. 



Ground color of head, thorax and ])rimaries ])ale, whitish luteous, 

 with a variably distinct reddish suffusion. Head and thorax immacu- 

 late. Primaries usually with basal and t. a. lines obsolete; in a speci- 

 men with a strong reddish suliusion the lines well delined, of the ground 

 color, without darker margins; t. a. line then decidedly angulated. 

 T. p. line very even, nearly parallel with the outer margin, marked by 

 a series of venular short dashes, beyond which is a ligiiter shade line; 

 in the suttused specimen the median space is reddish, and the contrast 

 between it and the s. t. space defines the course of tlie line better. 

 S. t. line traceable, slightly paler, somewhat irregular. A row of sniall 

 terminal lunules. Claviform wanting. Orbicular round, small, slightly 

 darker centered, with a somewhat paler annulus ; obsolete in pale 

 specimens. Orbicular moderate, somewhat constricted centrally, 

 slightly paler ringed, inferiorly blackish ])ow<lered. Veins more or 

 less blackish marked, especially the median and internal. Secoiularies 

 in the male soiled whitish, in the female blackish. Beneath white, 

 with a more or less evident discal sjiot on primaries. 



Expands 31-;37""" ; 1.25-1.50 inches. 



Habitat. — Colorado, Nebraska, Arizona. 



215 



