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the anterior cox closely embracing the base of the head, the others 
widely 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. Exterior 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, distinct. 
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 Buropean analogue of this species is T'ychea phaseoh. 
Geoica syuamosa, nD. gen. et sp. 
(Plate IX., Fig. 5 and 6; and Plate X., Fig. 1, 2, and 3.) 
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 the attention of any 
close observer of the corn root insects, but never yet numerous enough 
in our observations to do any perceptible harm. 
The following chronological list shows its dates of occurrence in 
our collections, its forms, its food plants, and attendant ants: 
Jan. 20, timothy roots; Lasius; viviparous female. 
Feb. 13, in grass roots; in Lasius colony; oviparous female. 
Mar. 9, sod, by fence, near corn field; Lasius niger. 
“ 21, in last year’s corn hill; burrows of Lasius. 
« 28, in last year’s corn hill; burrows of Lasius. 
“26, sod; several nests of Lasius mger. 
“ 29, sod, along fence between corn field and pasture; L. niger; eggs. 
Apr. 1, grass roots and a dicotyledonous weed ; large nest Lasiuws mixtus. 
“ 4, roots of shepherd’s purse; Lasius niger. 
5, breeding cage; young, from eggs of Mar. 29. 
“ 6, on roots of old corn and under boards. 
“ 10, roots of shepherd’s purse; Formica fusca gagates. 
“ 19, grass roots, in meadow; Lasius niger. 
“ 26, in blue-grass sod; frequent in nests of Lasius niger. 
May ‘7, grass; Lasius nest. 
«8, timothy roots. 
“9, roots of young oats in corn ground. 
“ 19, sod; Lasius niger. 
“ 19, on corn roots in old sod ground, one with beak in root; Lasius 
niger. 
“ 21, on corn roots in grass ground ; Lasius niger. 
“21, on corn roots.in grass ground. 
“ 21, on corn roots, meadow last year; one killed by mite; Lasius niger. 
« 24, on corn roots, grass ground; Lasius niger. 
“ 625, on young grass roots. 
“28, on corn roots; Lasius niger. 
«29, on corn roots; Lasius niger. 
“31, in Lasius nest. 
ce 
