In the present revision, the American species of the genus Lithocolletis* are divided into several natural and easily definable groups, based upon structural differences, not sufficient, however, to warrant the establishment of new genera. Of necessity, this work is far from complete ; the West remains practically unexplored, and it is to be expected that a large number of species are still awaiting description. It is hoped that this systematic arrangement, and the collection of scattered descriptions, rendering identification less difficult, will result in increased effort on the part of those having an opportunity for breeding and collecting in little known regions. It was the original purpose to give illustrations of every species. * Lord Walsingham, in the "Microlepidoptera of Tenerife" (Proc. Zool. Soc. Lond., 976, 1907), has revived the name Phyllonorycter Hb. for this genus. TKAN6. AM. KNT. SOC. XXXIV, (34*) SEPTEMBER, 1908. M177975 K. Posterior tarsi whitish. L. Two dorsal streaks above the tornus, each uniting with its corresponding costal streak ledella. LL. One dorsal streak above the tornus aliii. alnicolella. KK. Posterior tarsi fuscous above, or tipped with black. L. First dorsal streak short, not attaining the fold. minutella. LL. First dorsal streak very long. M. First dorsal streak beginning much nearer the base than first costal ; expanse 8-9 mm. propiiiqiiinella.
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