REVISION OF 8PEC1ES OF THE GENUS ArjROTIS. 101 



though there is little absolute dittVrence in inaculatioii, the less cou- 

 tiasling colors and sordid appearance of the whole insect readily dis- 

 tinguish the si)ecies. 



It is more than i)rol)al)le that large specimens of this species are gen- 

 erally foutul in collections as auxiliatis, and indeed I have seen ex- 

 amples so named by Mr. Grote, who in his new list places this species 

 as a variety. 



Chorizagrotis sorror Sinitli. 

 1887. Siiiitli, Pro(\ U. S. Nat. Mils., X, 4.'>:5, .Igroiis. 



Color of primaries gray, a more or less evident fu.scous tint in median 

 and terminal space ; in the former not invading the costal region or 

 hind margin, and leaving a gray dash through submedian space. All 

 between and before the ordinary spots blackish. A black sub-basal 

 spot. T. a. line geminate, dark, included space gray, uot crossing 

 costal space, outwardly curved between veins. T. p. line single, crenu- 

 late, parallel with outer margin. S. t. line gray, sinuate, marked by 

 the dark terminal space, and a preceding dark shade. Claviform very 

 faintly outlined, concolorous. Ordinary spots gray with dusky center, 

 outlined in black; nuxlerate in si/.e, normal in form. ITead and thorax 

 gray; collar with a black line. Secondaries fuscous, veins <lark 

 marked. Beneath gray, i)owdery. 



Ivxpauds 35""" ; 1.4 inches. 



JiAKiTAT. — INIontana. 



Two 9 s[)e(*imens from Mr. ITulst furnish the types. The male char- 

 acters will undoubtedly be found to bti much like those of aitxHians 

 and /u/ro/erew.v, to the latter of which the uew form is closely allied. 

 Ill this group, however, of which anvil la ria is ty[>ical, the species seem 

 to pii'sent absolutely no variation, and the apparent contrary shown in 

 sonu^ collections arises simply from the fact that two and sometinu's 

 three species are very geiu»rally mixed. The maculation and habitus 

 IS nearly alike, but structurally the species <litfer very decidedly in the 

 form of the S genitalia. 



In this species the yellow is entirely replaced by bluish gray, and 

 there are no distinct contrasts except in the cell, which is the darkest 

 part of the wing. 



Chorizagrotis agrestis Grt. 



1870. Grt., Bull. G»>(>1. Smv., iii, lis (var. an.riHari!<.) 



nicrcoitifia Grt. 

 1878. Grt., Hull. Geol. Snrv. iv, 171 .ifjrotis. 



Hrxilia Morr MSS. 



Uniform bluish gray over luteous ; the latter color very evident in the 

 outer half of median space. All the lines evident, geminate, variably 

 distinct in the s])ecimens. T. a. line widely curved between the veins. 

 T. p. line parallel with outer margin, outer line often very faint. A nar^ 



