CHAMBEJRS ON TINEINA OF COLOKADO. 139 



is sometimes indicated in rohiniella by a few white scales on the fokl ; 

 a single specimen of amorpluaella does not afford sufficient ground for 

 saying that it is always absent in that variety, nor the few specimens of 

 texana that it is always absent in it, while in ampJiicarpeoeella it is 

 sometimes faint and sometimes spreads over the whole dorsal margin be- 

 hind the basal fourth. We cannot separate the varieties on this ground. 

 There is a difference in brilliancy of coloring, ampMcarpeoeella being the 

 most and amorphccella the least brilliant 5 but this may be only the effect 

 of different food, and this may also cause the difference of size, amphi- 

 carpeceeUa again being the largest and amorpliiGella the smallest. But 

 the remaining differences are more important; for although if the mar- 

 ginal streaks were equally oblique, the fact that opposite ones sometimes 

 united and sometimes did not might easily be paralleled by other in- 

 stances, yet when we find streaks so oblique as in rohiniella and not 

 distinctly confluent, and in amorpJuvella and texana streaks so nearly 

 perpendicular to the margin, and so distinctly confluent, and also wings 

 so much narrower in proportion to length as they are in the two latter 

 species, we must admit that we have something more than merely acci- 

 dental variations. It is at least a case of Mr. Walsh's phytophagous 

 varieties. 



L. salicifoUella Clem. & Cham. (Clem., Proc. Eut. Soc. Phila., vol. i, 

 p. 81; Cham.*, Can. Eut., vol. iii, p. 163; Cin. Quar. Jour,, vol. i; Can. 

 Ent., vol. ix). 



L. sGudderella? Frey. — There is no doubt in my mind that Professor 

 Frey's species is identical with salicifoUella. L. salicifoUella appears to be 

 more common in high than in low latitudes and altitudes. I have found 

 the larva mining leaves of aspens and willows up to near 11,000 feet. 



L. alnivorella Cham. (Cin. Quar. Jour,, vol. ii, p. 302). — 1 have not found 

 it above 8,000 feet. There is another species which mines the leaves of 

 a different species of Ahms, but which I did not succeed in rearing, the 

 larva of which belongs to the fat group, (There are two larval forms in 

 this genus ; one cylindrical, and making a teutiform mine, usually on 

 the under side of the leaf, like that of L. alnivorella ; the other having a 

 flat or depressed larva, which makes a flat mine, almost always on the 

 upper surface of tbe leaf.) The mine has a central opaque portion con- 

 taining the "frass", or excrementitious matter, wtth clear branches, or 

 streaks radiating from it. I only met with it in a few instances at 

 Manatou ; altitude, 0,000 feet. 



L. quercitorum Frej = f L. ftchella Clem. {Arf/i/romifjes quercifoUella 

 Fitch). — L.ftchclla seems to be common in the Eastern States. I have 

 not seen it, and cannot determine certainly as to its identity with 

 quercitorum Frey. If it is the same, ftchella has priority. I think 

 they are most probably distinct. Frey dcscvibad quercitorum from Texas. 

 I have also bred it from mines in scrub-oak leaves at Edgerton, Colo- 

 rado ; altitude, 0,500 feet. 



