95 
segment, equidistant on the abdomen, the outer row being at 
the lateral margin. The two middle rows approach at the base 
of the abdomen, and are close together on the thorax and head, 
the head having four unequal glands in each row, placed within 
the dusky patch. The other four rows do not appear on the 
head, and are very indistinct on the thorax, excepting the pro- 
thoracic spot of the outer row, which is small but distinct, and 
below the side margin, those on the other thoracic segments 
being dorsal. On the abdomen, the outer row consists of large 
lateral spots; the seventh segment has but four spots, two lat¬ 
eral and two dorsal, the latter small and inconspicuous. Corni¬ 
cles wanting. The anal plate, cauda, and a short and narrow 
transverse band on the eighth segment above, are light yellow¬ 
ish brown, a whitish line on the anal plate just behind the cauda. 
Anal plate strongly prominent, subglobose, very convex below 
and more flattened above, minutely scabrous, clothed with 
rather long incurved hairs; cauda represented by a shorter sub- 
triangular elevated plate on its upper surface, 
Beak brownish dusky, tip black, attaining or slightly surpass¬ 
ing hind coxae, apical joint about as long as last antennal 
joint, penultimate joint about half as long, and somewhat 
thicker, being about as long as thick; lunate marks at its base 
distinct; apparent basal joint slender, about two and a half 
times as long as the apical two combined. Legs rather short, 
light brownish dusky, coxae paler, sutural lines brown about 
coxae, two distinct claws and two tarsal joints on all the legs, tarsi 
and claws dark; fore legs very close to head. Prothoracic 
spiracle light brown, distinct, below the lateral gland. Abdom¬ 
inal spiracles each in the posterior margin of a small brownish 
spot, anterior margin of spiracles finely outlined in black; 
Sometimes an inner row of light brown spots, one beneath each 
abdominal spiracle. Seventh ventral segment with a thickened 
and slightly darker plate at middle, which has at each end a 
group of sparse hairs. A few hairs on the ventral segments 
preceding the seventh. 
Length of body 2.2 mm., greatest width (across abdomen at 
middle) 1.1 mm., antenna, .55 mm. 
The young are more slender, with longer beak and five-jointed 
antennae, or four-jointed in the youngest. 
Described from ten lots of specimens. 
The cauda and anal Jplate and antennal structure will dis¬ 
tinguish this species, in case the glands are not evident, from 
the others infesting corn. 
For da Occident alis, n. sp. 
(Plate IX., Fig. 3.) 
Another root louse which has been found on corn in unim¬ 
portant numbers is a species of Forda, here described as new. 
It seems to be mainly a grass root louse, and has been taken 
by us eight times, as follows: April 4, (no situation given); 
