IOWA ACADEMY OP SCIENCES. 
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and thorax respectively; abdominal segments 1-3 and 7-10 
entirely brown var. c 
6. Head, from dorsal view, semiovate; ocelli subapproximate, 
conspicuous; spines and bristles, short and few; bristles on 
penultimate segment of abdomen equally long striata, Osb. 
Head, from dorsal view, subrectangular; ocelli remote, 
inconspicuous; single strong bristle at each posterior angle of 
prothorax; intermediate bristles on penultimate segment of 
abdomen, one-half as long as lateral bristles, inasqualis, n. sp. 
7. Size medium; antennas sub-approximate; ocelli inconspicu- 
ous; prothorax, transverse; bristles at posterior angles of 
medium length; spines at base of cubitus arranged in two 
groups t abaci, Lind . 
Size large; antennse approximate; ocelli, conspicuous; pro- 
thorax, subquadrate; bristles at posterior angles of prothorax, 
long; spines at base of cubitus in single group ..lactucas n. sp. 
8. Antennas eight-jointed; ocelli approximate; spines and 
bristles, except those on abdomen, long and slender; bristle at 
middle of each lateral margin of prothorax, one at each ante- 
rior and two at each posterior angle.. pallida, n. sp. 
Thrips {Euthrips) tritici, Fitch. 
[Second report.] Trans. N. Y. State Agr. Soc. for 1855, 
p. 536; Osborn Can. Ent., Vol. XV, p. 156 (1883). 
Thrips (Euthrips) maidis n. sp. 
Female. Length, 1.83-2.mm. A large species slightly variable in color, 
brownish-black, but sometimes paler; annulus on antennse, extremities of 
femora and tibiae, lower surface of the latter and sutures of abdomen yellow- 
ish-white; thorax, especially its sutures, tinged with yellowish-ferruginous; 
anterior wings dusky white; head pentagonal, front margin produced 
and rounded in the middle; ocelli distant, antennae subapproximate; 
spines and bristles 'Strong, blackish, arranged much as ins', tritici. Pitch; 
costal spines 25-29; cubital, 19-23; radial, 15-16; anal, 5; internal, 1, 
Head, from dorsal view, pentagonal, scarcely broader than long; its 
sides parallel; anterior border produced and rounded in the middle; 
occiput less than one-half the length of the head measured on a median 
line, plainly striated; genae uniformly full; eyes rather large, coarsely 
granulated, feebly pilose; orbits yellow, encircled with a few short hairs; 
ocelli, pale yellow, margined with red crescents, widely separated and 
arranged in a broad triangle with its lateral angles contiguous to superior 
orbits; vertex broad, gently convex between lateral margins; produced 
cephalad and provided with a transverse row of four short hairs near its 
anterior margin; the front wide with medial, longitudinal elevation; 
antennal sockets occupying less than its entire width, making antennse 
subapproximate, more widely separated than in E. tritici, Pitch; anten- 
nal joints 3 and 4, occasionally base of 5, white, the rest, black; joint 1 
globose, more than one-half as long as joint 2; the latter subglobose, 
somewhat contracted toward base, both joints more robust than those fol- 
lowing: joints 3-5 elongate, submoniliform, decreasing in size in the 
