342 THE CANADIAN ENTOMOLOGIST 



414. Therasea angnstipennis Grt. — I have not seen the de- 

 scription of this species, but Hamoson figures the type, a female 

 from Bosque County, Texas. That has fewer whitish areas than 

 any of my series, which are nearly all from Alberta, but is evidently 

 the same species. In common with most species in this and allied 

 genera, the males have usually much more white than the females. 

 Some of my females have the olive brown shading on the costa 

 from the base to the t.a. line, and in one it continues with scarcely 

 a break to the t.p. In some the costa is almost clear except for 

 three or four patches, some or all of which usually join the exten- 

 sive brown region below the median vein. In males, the costa is 

 on the average much cleaner, and the patches are much reduced, 

 sometimes almost entirely lacking. Their position is som.etimes 

 indicated by distinct yellowish shades, which may extend faintly 

 all along the costal area. Specimens with the yellow shades are 

 var. fiavicosta Smith, which was described as a species from five 

 males and two females from Hot Springs, New Mexico; Colorado, 

 and Montana. I have compared one of my specimens with all, 

 or nearly all, the type material. A male type from Colorado in 

 the Washington collection has the costa clear nearly to the apex, 

 with very little yellow, indeed. The variation appears to be more 

 common in the male sex. The species is by no means rare on the 

 Alberta Prairies. 



415-416. The specimens formerly referred to by me under 

 the^e two headings appear to be all one species, tortricina Zeller, 

 by the British Museum collection, which Hampson places in his 

 genus Tarachidia. The typical form appears to be ochre yellow, 

 which is my No. 416. Hampson mentions three varieties as aberra- 

 tions. "Ab.I., with the markings almost obsolete," is obsoleta 

 Grt., though Grote's type, from Illinois, happens to be itself obso- 

 lete, all except the left hind wing. "Ab. 2, modesta, grey brown, 

 slightly suffused with yellowish white." This form occurs here, 

 and is one described by Henry Edwards. "Ab, 3, deleta, dark 

 brown, suffused with olive yellow scales, leaving the termen and 

 cilia dark, almost without markings." I seem to have this form 

 from here also, and it was likewise described by Henry Edwards. 

 Inorata Grt. stands as a synonym. I have a series of eight speci- 

 mens, taken on Pine Creek and on the Red Deer River prairie. 



