58 BITLLETIISr 132, UNITED STATES NATIOISTAL MUSEUM 



Aedoeagus long, tapering, moderately stout ; cornuti a row of a dozen 

 short slender spines. 



Genitalia figured from specimens in National Collection from 

 Missoula, Mont, (reared June 1, 1915, under Hopk. U. S. no. 11082, 

 from larvae in bark of Picea engehnanni, B. T. Harvej^). In nature 

 leucohasis feeds and flies in company with both r«na and laricana. 



Specimens in National Collection from Montana. 



Alar expanse. — 12-14 mm. 



Type. — In National Collection. 



Type locality. — Evaro, Mont. 



Food plants. — Larix occidentalism Picea engelnianni. 



25. LASPEYRESIA GALLAESALICIANA (Riley) 



(Figs. 166, 331) 



GraphoUtha gallaesaliciana Riley, Trans. St. Louis Acad. Sci., vol. 4, 1881, 



p. 320. 

 Enarmonia gallaesaliciana Fernald, in Dyar List N. Amer. Lepid., no. 



5280, 1903. 

 Laspeyresia gallaesaliciana Barnes and McDunnough, Check List of Lepid. 



Bor. Amer., no. 7236, 1917. — Forbes, Memoir 68, Cornell Univ. Agr. 



Exp. Sta., 1924, p. 395. 



The palest of the Lespeyresia (except lantiuscula) , and a very 

 beautiful species. The larvae are gall makers on stems of willow. 

 Hind wing with veins 3 and 4 short stalked. Aedoeagus slender, 

 tapering to a narrow band toward apex; cornuti a single cluster 

 of short rather slender fixed spines. 



Genitalia figured from reared specimens in National Collection 

 from Boston, Mass. (May 6-8, 1910, Miss Clarke). 



Distribution. — Massachusetts, New Jersey, Pennsylvania, Illinois, 

 Missouri. 



Alar expanse. — 11-13 mm. 



Type. — In National Collection. 



Type locality. — St. Louis, Mo. 



Food plant. — SaXix. 



26. LASPEYRESIA LAUTIUSCULA, new species 



(Fig. 168) 



Antenna dusted with white above. Palpus, face, and head white. 

 Thorax black marked with white; posterior part of thorax and al- 

 most all the tegula except anterior margin, white. Fore wing white 

 with apical area blackish and an incomplete dark basal patch ; basal 

 patch lead colored, rather faint, reaching only to top of cell from 

 dorsum; apical dark area triangular, inner margin straight and 

 slanting, extending from outer third of dorsum to apex; costa very 

 faintly marked beyond middle with outwardly slanting, pale, smoky 



