26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 119 



brown with buff to gray white at apices of tarsal segments. Abdo- 

 men: ocheroiis basally, paler distally, posterior margin of segments 

 pale buff; ventral surface yellow white with scattered brown scales, 

 (This description was taken mamly from the specimen used for the 

 photograph. Others differ in the amount of brown present on 

 various surfaces.) Alar expanse: 17.0-20.5 mm. Male genitalia: 

 as in figure 72 (RWH shde 2642). Female genitalia: as in figure 

 144 (RWH slide 2629). 



Food plant: Unknown. 



Type: Female, USNM. 



Specimens examined : 



UNITED STATES: Arizona: Douglas, 1?, Sept. 16, 1923, USNM; 

 Mohave Co., 19, Sept. 16, 1923, USNM; Paradise, Cochise Co., 1?, Oct. 1-7 

 (RWH slide 2591), USNM; White Mts., 7200 ft., 1 cf , Aug. 15, 1925, O. C. Poling 

 (RWH sUde 2641), USNM. California: La Puerta Valley, 4cf , 2 ? , Septem- 

 ber-October 23 (RWH slides 2629 and 2642), USNM; 7 mi. N Temecula, River- 

 side Co., 1?, Oct. 19, 1960, J. Powell, UCB; Upper Santa Ana River, San 

 Bernardino Co., Icf, 19, Sept. 15-19, Sperry, USNM; West Riverside, 2c^, 

 19, Oct. 26, 27, 1925 (AB slide Mar. 21, 1933, RWH slide 2590), USNM. 

 Colorado: Bear Creek, Morrison, 3cf , Aug. 23, 1904 (RWH slide 3432), USNM; 

 Denver, 7d', Sept. 5, 9, Oslar (RWH slides 3424-3429), USNM; Durango, 1 9 

 Sept. 26, 1945, E. C. Johnston (RWH slide 2637), CNC; Lamar, 3d^, Sept. 24, 

 1945, E. C. Johnston (RWH slides 2734, 3433, and 3441), CNC; Rock Creek 

 Canyon, 3cr, Sept. 10-29, 1957, Margot May (RWH slides 3438-3440; RWH 

 wing slide 55), CPK, USNM; no locality, 5000 ft., 2d^, August 1891, BMNH. 

 Montana: Boulder, IcT, Titus Ulke (RWH slide 2750), USNM; Butte, Ad", 

 Sept. 12, 1945, E. C. Johnston (RWH slide 2635), CNC, USNM. New Mexico: 

 Ft. Wingate, 1 9 , Sept. 1-7, USNM; Hell Canyon, 1 cf, Sept. 15, 1916, C. Heinrich 

 (RWH slide 2624), USNM; Mesilla, 1 cf, C. N. Ainslie, USNM. Utah: Deer 

 Creek, Provo Canyon, 1 cf , Sept. 16, 1918, T. Spalding, USNM; Eureka, Id', 

 Aug. 27, 1911, T. Spalding (JFGC slide 9906), USNM; Lehi, 3cr, Sept. 29, 30, 

 1939, H. F. Thornley, CNC; Salt Lake City, 19, 5-90, Ainslie (RWH slide 

 2643), USNM; Spanish River, 1 cf, Sept. 4-8, CNC. Washington: Satus Creek, 

 Yakima Co., Id', Sept. 16, 1949, E. C. Johnston (RWH slide 2752), CNC. 



CANADA: Alberta: Dorothy, Id', 1921, W. G. Hodgson, BMNH. 



Discussion: L. rectistrigella, as defined above, includes a relatively 

 homogeneous appearing group of moths. The major criteria for 

 recognition of the males are the width of the sensory areas of the 

 antennae, the aedeagus of the male genitalia, and the smooth frons. 

 A series of specimens from Colorado and Montana have the sensory 

 areas of the male antennae about one-third to one-half the width of a 

 segment, and two well-defined bars are present on the forewings. 

 They would seem to be variabilis from these characters; however, the 

 male genitalia place them with rectistrigella. Three possible interpre- 

 tations exist for this series: (1) The width of the male anteunal sensory 

 areas is variable and thus has no taxonomic significance in this 

 species. (2) The width of the male antennal sensory areas is not 



