‘$60 Tomes 
Tychea brevicornis, n. sp. 
(Plate IX.,; Big. 4.) 
This species of root louse is not important, and has not been known 
to occur in destructive numbers, but from its occasional presence on corn 
roots, it deserves mention along with others of its group and habits. 
A colony of this '’yehea was found on corn roots at Normal, IL, on 
the 28th of July. The specimens in this collection all appear to be 
young pseudogynes, or wingless viviparous females, from about one third 
to two thirds grown. <A: large adult wingless viviparous female was 
taken on the 25th of October from an ants’ nest in a pasture field near 
Champaign. 
Derscoriprion.* 
Wingless Viviparous Pemale-—Body broad-oval, pale dirty whitish 
in alcoholic specimens, smooth, sutures not distinct. 
Head short, rather narrow between antennx, but very broad at base, 
which is more than three times as long as the frontal margin, the union 
between head and prothorax being very close; lateral margins concave, 
a pale dusky brown patch occupying the anterior surface between the 
antenne, terminating behind with a semicircular irregular margin, not 
extending towards the acute lateral angles nor attaining the hind mars 
gin. It is'divided by a median whitish line, on each side of which is a 
white glandular dot. An angular brownish patch also surrounds each 
eye. Antenne short, but rather slender, hardly surpassing the posterior 
margin of the prothorax, five-jointed, uniform light brownish, with pale 
sutures; I short, twice as thick as III, and not as long as thick; II one 
half longer than I and nearly twice as long as thick ; TLL nearly as long 
as I and IT combined; IV very short, about as long as thick; V as long 
as II, with a short cylindrical spur about one half the diameter of the 
segment, and scarcely as long as the diameter of thi§ joint at the base. 
Sensoria rather small and inconspicuous, round, one as usual at the 
apex of IV beneath, and one at the base of the spur of V. Eyes distinct, 
contiguous to the prothoracie margin, ocular tubercles feebly elevated, 
with the usual three lenses. Prothorax very indistinetly separated from 
head, but distinetly marked off posteriorly by the deepening of the suture 
on each side and the more rapid w idening of the body just behind it. 
Upon the abdominal segments appear traces of four large excretory 
glands on the dorsal surface of each segment. No cornicles. Cauda and 
anal plate light yellowish brown, very short and broad, the former at 
the apex of the abdomen, the latter on the ventral surface, not visible 
from above. 
Beneath yellowish, a faint yellowish brown tint between the pos- 
terior legs. Beak short, seldom attaining the middle coxw, and about as 
long as the antenna, base and apical half light brownish yellow, extreme 
tip blackish; apieal joint bhats equal in diameter and length to the 
second antennal joint; penultimate joint a little shorter and about equal 
in length and breadth, the lunate marks at its base distinet; apparent 
basal (second) joint considerably longer than the apical two com- 
bined, and rather slender. Legs light yellowish brown, moderately long, 
* By C. A. Hart. 
