80 



scarcely longer thau the first, is a little oblique aud also inwardly dark-uiar- 

 gined; beyond this are two more narrow costal streaks, the first curved out- 

 wards and dark margined internally, the second pointing inwards from above the 

 apex, with a few black scales at the extremity; the second dorsal streak is trian- 

 gular, dark-margined internally and around the apex, commencing somewhat 

 further from the base than the second costal streak, its point lies between the 

 second aud third ; the two last of the four dorsal streaks are very slender and 

 pointing inwards, with a few black scales at their ends; where they reach the 

 points of the costal streaks above them a black elongate spot lies at the a^jex, 

 separated from the dark apical line which lies at the base of the golden-gray 

 apical cilia. 



Hind-wings and cilia, gray, with a faint golden sheen. 



Abdomen, gray, anal tuft paler. 



Hind-tarsi, whitish-gray, unspotted. 



Exp. al. 9-10™m. 



Type S 9 Mus. Wlsm. 

 Six specimens, brtd from somewhat folded mines, occujiying the whole upper side 



of leaves of Ledum glandiilosum, found in June in Mendocino County, Cal., and 



bred the same month. I met with this species also ou the wing at the same time and 



place. It appears to be nearly allied to salicicolella Sircom, among the European 



species. 



LithocoUetis alnicolella, sp. n. 



AnienncB, whitish, very faintly spotted above. 

 Palpi, white. 



Head, face white, frontal tuft grayish saffron. 

 Thorax, pale grayish saffron touched with white at the sides. 



Fore-wings, pale grayish saffron with three dorsal and four costal silvery-white streaks, 

 all dark-margined on their inner sides and at their poinds; a somewhat broad but 

 very indistinct white medio-basal streak extends above the fold to one-third the 

 wing-length, and a shorter streak of the same color follows the dorsal margin 

 from the base to half the length of the one above it ; the first dorsal streak is 

 broad, outwardly oblique, and reaching nearly to the smaller triangular costal 

 streak above it; in some specimens it actually attains to it, forming an angulated 

 fascia; the point of the second dorsal, also somewhat triangular, is directed a 

 little beyond the point of the second costal streak above it; these are both nearly 

 perpendicular; the third dorsal very small; arising opposite the space between 

 the third and fourth costal streaks, it reaches to the apex of the former ; the end 

 of the wing is inclosed by a dark semicircular line at the base of the cilia, within 

 which is an elongate blackish spot; the cilia are grayish, with a faint satfron tinge. 

 Hind-wings and cilia, also pale grayish. 

 Abdomen, gray above, anal tuft scarcely paler. 

 Posterior tibice, whitish, unspotted. 

 Pxp. al. 6""". 

 Ty2)e, $ 9 Mus. Wlsm. 



Two specimens were bred from larvf© found raining the upper sides of leaves of 

 Alnus incana ou Mount Shasta, Siskiyou County, Cal., in August, 1871, in which 

 month the perfect insects emerged. Three other specimens were met with on the 

 wing, also in the neighborhood of Mount Shasta. Judging from Chambers' descrip- 

 tion, his alnivorella must be exceedingly close to this species. There are certain dis- 

 tinct differences in the position and extent of the dorsal streaks, but my chief reason 

 for regarding it as distinct is that Chambers describes the larva of a/nii'ore/Za as feed- 

 ing on the under side of the leaf, whereas my species feeds on the upper side of 

 another species of alder. I am not aware of any instance of an alder-feeding Litho- 

 coUetis feeding on both sides of the leaves. 



