168 
TYCHEA ER1GERONENSIS. n. Sp. 
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A short time ago I received from Prof. T. J. Burrill of the Indus¬ 
trial University a very neat drawing accompanied by notes, and some 
specimens of a wingless plant-louse found on the roots of Endive and 
Erigeron canadense , which as will be seen by his notes, copied below, 
he susposed would fall in the genus Trama. 
I am in considerable doubt as to the proper position of the species, 
but for reasons given below I am inclined for the present to place it 
in Tychea of Koch, as it is excluded from Trama , as limited by 
Passerini, by the tarsal character. 
Wingless specimens (the only kind observed).—Antennae apparently 
only five jointed unless the little spur at the end be considered a 
sixth joint; third joint slightly the longest and about equal in length 
to the first and second; fourth about three-fourths the length of the 
third; fifth slightly longer than the fourth, and appears to have a spur 
or rudiment of a sixth joint at the tip. Eyes not apparent, but the 
position occupied by a small, white, granulated protuberance. Beak 
long and stout, reaching slightly beyond the base of the posterior legs; 
the penultimate joint about' two-thirds the length of the last joint, and 
broad. Body very regularly ovate, and very convex; smooth, without* 
hairs, bristles or down of any kind, except a brush of short hairs at 
the tip of the tail. Apparently furnished with a short distinct, broad 
tail, but this may not be a true tail. The stomata are very distinct 
and brownish. No honey-tubes or signs of any, visible. The abdo¬ 
minal segments are very indistinctly marked/the ventral segments 
more distinct. The prothorax is rather narrow in front, and forms a 
very distinct offset with the mesothorax. 
The general color is transparent white, varying to a pale cream color; 
antenme dusky, and in some cases, even dark, almost black at the tips. 
Legs very short, femora and tibiae pale, dirty white; tarsi fuscous. 
Size small. 
Prof. Burrill, who is an excellent microscopist and close observing 
naturalist, furnishes the folowing memorandum in reference to them: 
“Champaign, Ills., Oct. 25, 1878. 
“Louse on the roots of Endive and Erigeron canadense, in the 
garden. They were noticed last year upon the former, and occasion¬ 
ally throughout the last summer, on both. Numerous, usually in 
clusters of many individuals of various sizes, No winged forms ob¬ 
served. All white, the apical joint of the beak, a little darkened; the 
feet and antennae somewhat bluish or brownish; eyes dark and verv 
small. Feet with two joints, the last very short and terminated with 
a pair of claws. Antenna? five-jointed, the third longest. Nine ab¬ 
dominal segments, each furnished with a (very small) tubercle on 
each side, and four dorsal ones, making four lines down the back, 
the inner ones of the first, second and third segments run together; 
two rows on the head and thorax. The lice are attended by a medium 
sized yellow ant, which seems to be very solicitous for their safety, 
taking them in their mouths and carrying them away when disturbed, 
and dying when separated from them. This louse is no doubt Trama 
radicis , mentioned by Harris. The body is plump and rounded when 
