98 
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; III nearly as long as I and II combined; IV very 
short, about as long as thick; V as long as III, with a short 
cylindrical spur about one half the diameter of the segment, and 
scarcely as long as the diameter of this joint at the base. 
Sensoria rather small and inconspicuous, round, one as usual 
at the apex of It beneath, and one at the base of the spur of 
A . Eyes distinct, contiguous to the prothoracic margin, ocular 
tubercles feebly elevated, with the usual three lenses. Prothorax 
very indistinctly separated from head, but distinctly marked off 
posteriorly by the deepening of the suture on each side and the 
more rapid widening of the body just behind it. Upon the ab¬ 
dominal 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 vellowish, a faint yellowish brown tint between the 
posterior legs. Beak short, seldom attaining the middle coxae, 
and about as long as the antennae, base and apical half light 
brownish yellow, extreme tip blackish; apical joint about equal 
in diameter and length to the second antennal joint; penulti- 
the lunate marks at its base distinct; apparent basal (second) 
mate joint a little shorter and about equal in length and breadth, 
joint considerably longer than the apical two combined, and 
rather slender. Legs light yellowish brown, moderately long, 
the anterior coxae closely embracing the base of the head, the 
others widety separated from each other by the broad flattened 
meso- and meta-sternum, the middle legs being nearly as far 
apart as the posterior pair, the anterior about half as far. Two 
distinct claws and two tarsal joints on all the legs. Ex¬ 
terior to each leg is an irregular longitudinal spot of pale 
dusky brown, the spots near the anterior legs uniting with those 
on the head which surround the eyes. Spiracles brownish, dis¬ 
tinct. Seventh segment with a transverse thickened plate at 
middle beneath, light yellowish brown posteriorly. 
Length of body 1.8 mm., breadth 1.1 mm., antenna .42 mm. 
Described from two lots of specimens. 
The European analogue of this species is Tychea phaseoli. 
Geoica squamosa , n. gen. et sp. 
(Plate IX., Fig. 5 and 6; and Plate X., Fig. 1, 2, and3.) 
Among the minor aphid insects of the corn plant is a small 
whitish or yellowish mealy species, occurring with ants and in 
their nests in corn fields and elsewhere often enough to attract 
