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Lachnus salicelis. Fitch. 
Under this name, Dr. Fitch gives a brief description of a species 
found on the willow which he supposes is different from either of 
those described as found on this tree. It is smaller than the one first 
described by Dr. Harris L. salicicola , and like that species is without 
the transverse rows of dots on the abdomen; and I rather suspect 
that after all it is but a variety of that species. 
It is black; tibiae and base of the antennae pale; base and costal 
margin of the forewings yellowish-white. Length .08 inch. Resides 
on the succulent twigs. 
Lachnus ulmt. Linn. 
In my paper on Plant-lice published in the 10th vol. of the Trans¬ 
actions of the Illinois State Horticultural Society, I mentioned a species 
by this name, following Dr. Fitch. This was an error, the species 
described by Linnaeus as Aphis ulmi is now Schizoneura ulmi hereafter 
described. The Aphis ulmi Deg. is now Tetraneuvcc ulmi. 
Laciinus populi. Linn. 
In the same paper I noted a species by this name, also following 
Dr. Fitch. This is now Chaitophorus populi and is distinct from our 
species, which I have named Chaitophorus populicola . 
Lachnus longistigma. Monell. 
“General color dusky, abdomen cinereous, with four rows of black 
dots. Apex of the stigma extending to the stigmal vein. Third joint 
of the antennae as long as the two following taken together, sixth 
joint about half as long as the penultimate. 
Length of the body 0.17—.20 inch; to tip of wings 0.33—.35 inch. 
“The antenna?, body and legs are very hairy. Head and thorax black. 
Abdomen ash gray, but appearing dusky on being divested of the 
puinose matter; dorsal surface with four rows of black spots, which, 
on close inspection with a lense, appear to be slightly elevated above 
the surface. Wings somewhat fumose; the “insertions" red. The 
veins are as usual in this genus, the first two discoidals being \ei} 
much more robust than the cubitus, stigma black, linear, extend¬ 
ing along the apical margin of the wing to the apex of the stig¬ 
mal vein, which is short and quite straight. 1 he stigma is olten 
slightly yellowish towards the tip and, in normal specimens, seems 1o 
extend just to the apex of the fourth vein, but frequently they are 
about .005 in. apart; and in one abnormal specimen the stigma ex¬ 
tended nearly .01 beyond the stigmal vein. In some specimens the 
