372 
This genus is perhaps more closely related to Allothrips gen. nov. 
than to any other, standing between it and Plectrothrips gen. nov. 
Neothrips corticis sp. nov. (Fig. 6). 
Female.—Length about 1.34 mm. Color nearly uniform light yel- 
lowish brown, with considerable irregular reddish brown hypodermal 
pigmentation; tube bright orange-brown, darker at middle. 
Eyes very small, consisting of a few large, lateral facets; ocelli want- 
ing. Antenne nearly concolorous with body, segments 1 and 2 often 
slightly darkened laterally; sense-cones long, slender, segments 3 and 6 
each with one and segments 4 and 5 each with two; three bristles on 
ventral surface of segment 7. 
Pterothorax about as wide as prothorax, its dorsum two-thirds as 
long as wide. Wings rudimentary. Tarsi and apices of tibize yellow; 
femora and basal three-fourths of tibize nearly concolorous with body, 
lighter along inner surface. 
Abdomen large, heavy, about one and one-half times as wide as 
prothorax; sides sub-parallel as far as segment 6, and then converging 
abruptly to base of tube. Tube .7 as long as head, and about 1.4 times 
as long as its basal width; abruptly narrowed at apex and slightly nar- 
rowed at middle, where. it is more heavily chitinized. 
Measurements:—Total length about 1.34 mm.; head, length .20 
mm., width .14 mm.; prothorax, length (excluding non-chitinous por- 
tions) .15-mm., width (including coxe) .29 mm.; pterothorax, width .28 
mm.; abdomen, width .42 mm.; tube, length .14 mm., width at base, 
/095 mm., at apex; .036 mm. Antenne. 1,310 432, 54 Ww. Somme 
44; 5,44 w; 6,45 w; 7, 50 w; 8, 29 »; total, .34 mm. : 
Male.—Slightly smaller than female (length about 1.2 mm.). Four 
bristles on ventral surface of segment 7. Abdomen more slender (about 
one and one-fifth times as wide as prothorax), tapering evenly from 
segment 7 to base of tube. 
Described from several specimens of both sexes taken under 
bark at Urbana and Hillery, [linois, in winter. 
ALLOTHRIPS gen. nov. (Fig. 7). 
(ados, of another kind; Oped, thrips.) 
Head large, about as wide as long; cheeks full, sparsely spinose: 
vertex elevated between eyes, and sloping abruptly to insertion of 
antenne. Antenne stout, seven-segmented, less than 1.6 times as 
long as head, inserted beneath vertex; segments 3-6 subequal in 
length, very slightly longer than wide; 2 and 7 longer, the: latter 
with a slightly arcuate row of four bristles on its ventral surface. 
