114 
Calltpterus castaneje. Fitch. The Chestnut Gay-louse. 
On the under sides of the leaves of the chestnut tree, puncturing 
them and sucking their juices in August and September; a small, sul¬ 
phur-yellow plant louse, with black shanks and feet, its antennae also 
black except at their bases and as long as the body, its wings pel¬ 
lucid, their first and second oblique veins and the tip of the rib vein 
edged with coal-black, and its thighs straw-yellow. Length 0.09, to 
tip of the wings 0.15. 
This insect, in company with wingless larvie and pupae of the same 
color, may frequently be met with upon the under sides of chestnut 
leaves. The name, “gay-louse,” which is of the same import with the 
generic term, Calltpterus, and is the equivalent of the German name, 
Zierlaus, which Koch applies to these plant lice, will be the most ap¬ 
propriate designation which our language furnishes for this and other 
species of this genus. Their bright, lively colors, and their long, slen¬ 
der antennae and legs, render them the prettiest objects belonging to 
the Aphis family. (Fitch.) 
Section LACHNINI. 
This secion, as heretofore stated, corresponds, as usually given, with 
the sub-family Laclininoe of Passerini. As here given it differs in 
having Callipterus removed from it. 
It is distinguished from the Siphonophorini and Aphiclini by the 
following characters: The antenme are but six-jointed, the sixth some¬ 
times being furnished with a short spur which might be considered 
as a rudimentary seventh; the honey-tubes are reduced to simple tu¬ 
bercles or are obsolete. The antennae are not situated on tubercles. 
Like the previous tribes or sections, the species belonging to this have 
three discoidal veins in the front wings, the third twice forked; the 
the hind wings two discoidal veins. So far as known, all the species 
produce winged individuals at some time; and are oviparous and vivi¬ 
parous as in the preceding sections. 
They are found generally on trees or woody plants and mostly on 
the limbs and leaves. All or nearly all of our species so far as in¬ 
vestigated are found on trees. 
