Nov. 5>i92i Pale Western Cutworm 291 



DISTRIBUTION 



Published records of the occurrence of Porosagrotis orthogonia are as 

 follows: Glencoe, Nebr., by Morrison (15, p. 2jg) ; Colorado, New Mexico, 

 Arizona, and Utah by Smith {16, p. i2g) ; Rocky Mountains by Dyar 

 (j. P- 139) ; Calgary, Alberta, (doubtfully) by Dod {2, 37, p. 53) ; Prairie, 

 Alberta, by Hampson (9, p. 102) ; and southern Alberta by Hewitt 

 {10, p. 177), Gibson (7) and Strickland {17). 



In Montana Porosagrotis orthogonia now occurs throughout the State 

 east of the continental divide. It has been most abundant in the tier 

 of counties which lies just east of the foothills of the main range of the 

 Rocky Mountains and which extends from the Canadian border to 

 within 100 miles of the southern border of the State. 



Mr. E. H. Strickland has kindly given the following information on 

 the present distribution of Porosagrotis orthogonia in Canada : 



Our records indicate that it is practically confined to southern Alberta, extending 

 as far north as latitude 51° and east to longitude 108°, although it has been recorded 

 as far as Regina, Saskatchewan. The maximum intensity, however, is confined to 

 an area that does not extend more than 100 miles east of the Rocky Mountains. 



Dr. William Barnes, of Decatur, 111., who has an extensive collection 

 of western noctuids, has generously furnished the following records of 

 Porosagrotis orthogonia specimens in his collections: Denver, Oak Creek 

 Canyon, Lavetta, and Alamosa, Colo.; Deming and Fort Wingate, N. 

 Mex. ; Provo, Vineyard, and Eureka, Utah; Yellowstone National Park, 

 Wyo.; Reno, Nev. ; Redington, Ariz.; and Kern County, Calif. 



Mr. George M. List states that Porosagrotis orthogonia is fairly com- 

 mon at Fort Collins, Colo., 430 moths having been taken at a trap dur- 

 ing the season of 1920. )<;■ ;0 I; 



To Mr. C. N. Ainslie, of the Bureau of Entomology, United States 

 Department of Agriculture, we are indebted for a record of 63 Porosagrotis 

 orthogonia moths reared from a shipment of larvae from Dickinson, 

 N. Dak., on June 10, 1920. 



From the foregoing records it is evident that Porosagrotis orthogonia 

 occiu-s at least in scattering numbers throughout the southwestern and 

 northwestern States with the possible exceptions of Oregon, Washing- 

 ton, and Idaho, where as yet it has not been collected. Correspondence 

 with entomologists throughout the territory where P. orthogonia has 

 been recorded indicates that it has never been of economic importance 

 outside of the heavily infested areas in Montana and Canada. 



METHODS OF STUDYING 

 IN THE INSECTARY 



Larvae were reared in individual tin boxes 1.5 inches in diameter. 

 The bottom of each box was covered with filter paper which was slightly 

 moistened at each feeding. This prolonged the freshness of the wheat 



