308 AMERICAN MICRO-LEPIDOPTERA. 



middle an oblique costal and a dorsal streak, faintly or not at all dark margined 

 internally, which sometimes unite to form an angulated fascia; three more 

 nearly perpendicular costal streaks; a dorsal streak before the toruus, oblique 

 and pointing toward the third costal streak; sometimes two more dorsal streaks 

 above the tornus, which unite with the third and fourth costal streaks respec- 

 tively, thus enclosing the apex, which then contains a small patch of blackish 

 scales. Usually, the last two dorsal streaks are wanting, and the black scales are 

 so increased as to occupy the entire apex, a line of them extending to the tor- 

 nus. Often all of the marks are very ill-defined and the entire thorax and dor- 

 sal portion of the wing below the fold is of the pale color, and the black area 

 at the apex is very pronounced. Alar expanse 6.5-7.5 mm. 



Hindwings and cilia pale grayish ocherous. Abdomen pale gray, with silvery 

 anal tuft. Legs pale silvery ocherous. 



Described from a series of specimens bred from mines on the 

 underside of leaves of a species of Salix, received from Mr. G. R. 

 Pilate, Mills College, Alameda Co., Cal., and from two captured 

 specimens in the U. S. Nat. Mus., from Seattle, Wash. (Prof. T. 

 Kincaid, collector). 



Lithocolletis basistrigella Clemens. 



Plate XXII, Fig. 17. 



Lithocolletis basistrigella Clemens, Proc. Acad. Nat. Sci. Phil., 321, 1859. Tin. No. 

 Am., 39, 65, 69, 1872. Chambers, Can. Ent., iii, 148, 166, 182, 1871. 

 Gin. Quart. Jn. Sci., i, 205, 1874. Walsingham, Insect Life, ii, 25, 

 1889. Busck, Proc. Ent. Soc. Wash., v, 188, 1903. Dyar, Bull. 52, U. 

 S. Nat. Mus., 1902, No. 6301. 

 Syn. intermedia Frey and Boll, Stett. ent. Zeit, xxxiv, 210, 1873. Chambers, Gin. 



Quart. Jn. Sci., ii, 230, 1875. 



"Antennae silvery. Front silvery, tuft fulvous, mixed with silvery. Thorax 

 pale, reddish golden, with a white streak on each side, and one in the middle. 

 Forewings shining ocherous saffron, with a slender unmargined white basal 

 streak in the fold, a white basal streak along the costa, narrowly dark margined 

 on the extreme costa, extended to the first costal streak, which is silvery white, 

 very oblique and unmargined ; behind this are three small costal streaks of the 

 same hue, the two central dark margined internally. Opposite the first costal 

 streak is a long, very oblique, silvery white dorsal streak, extending along the 

 inner margin to the base, with dark brown scales between their hinder ends, or 

 exterior to the tip of the dorsal streak, but sometimes absent. Nearly opposite 

 the third costal streak is a dorsal silvery streak dark margined internally. No 

 apical spot, sometimes with dispersed brown scales beneath the last costal spot. 

 The hinder marginal line blackish ; cilia pale fulvous. Posterior wings gray; 

 cilia gray, with a fulvous hue." 



The alar expanse, omitted in the original description, is 8 mm. 



The mines of this species are very common on the underside of 

 leaves of oaks. The mine lies between two veins and is nearly rec- 

 tangular in shape and unwrinkled. At the time of pupation, the 



