March, '08] ENTOMOLOGICAL NEWS. 103 



white streaks, all dark margined internally and more or less dusted with 

 blackish scales, the last two pair, however, not dusted. These streaks 

 are situated as follows : a large oblique white costal streak at the basal 

 fifth, attaining the middle of the wing and prolonged backward; nearer 

 the base an oblique dorsal streak, almost meeting the first costal before 

 the middle; the second costal streak also oblique; the second dorsal 

 streak nearer the base than the second costal, large, oblique, strongly 

 constricted just below the fold, and uniting with the apices of the first 

 and second costal streaks ; third costal and third dorsal streaks nearly 

 opposite, less oblique, their apices separated by a narrow prolongation 

 of the blackish internal margin. The fourth costal and dorsal streaks, 

 of which the costal is at the apical fourth, the dorsal at the tornus, 

 form an inwardly convex white fascia. Fifth costal and dorsal streaks 

 also form a curved white fascia. An irregular blackish apical spot. 

 Marginal line in the cilia blackish with a bluish luster. Cilia gray. Alar 

 expanse 9-10.5 mm. Hindwings gray. Cilia gray with a reddish tinge. 

 Abdomen dark gray above, grayish white beneath. Anal tuft grayish 

 ocherous. Legs dark gray, tips of the tarsi lighter. 



Described from specimens bred by Mr. W. D. Kearfott from 

 tentiform mines on the underside of leaves of Populns treinn- 

 loidcs Michx., received from Mr. J. W. Cockle, Kaslo, B. C, 

 Aug. 26, 1907. The images appeared during the same month. 

 The mine is large (for an underside Lithocolletis mine), oval, 

 and with a fine fold through its long axis. It closely resembles 

 the mine of L. salicifoliclla. on poplar, bvit is very much larger. 



There is considerable variation in the extent of the white 

 markings ; sometimes the fascia formed by the fourth pair of 

 streaks is interrupted, and the fascia just before the apex does 

 not reach the inner margin. 



This species is very close to L. salicifoliclla in the character 

 and arrangement of markings ; but may be distinguished from 

 it by the much greater expanse, the slightly shining and more 

 reddish ground color of the forewings, the slightly less oblique 

 position of the white streaks, and by the noticeable bluish luster 

 of the marginal line in the cilia. The specimens which appear 

 in August are densely dusted, in this respect differing from the 

 corresponding brood of L. salicifoliclla. 



Possibly this may be the species from Colorado, which Cham- 

 bers doubtfully identifies as L. salicifoliclla. (Cin. Quart. Jn. 

 Sci., II, 302, 1875) 



