370 
PLECTROTHRIPS, gen. nov. 
(xAjKtoov, spur; Joe, thrips.) 
Head slightly longer than wide; cheeks full, without spine-bearing 
warts; vertex elevated, transverse. Eyes moderately large. Ocelli pre- 
sent, anterior. Antennz inserted beneath vertex, twice as long as head, 
eight-segmented; segments 3-6 provided each with two or three short, 
stout, roughened sense cones; segment 8 noticeably longer than segment 
7, very slender, compressed, provided with a single terminal bristle. 
Mouth cone very small, only about one-fourth as long as prothorax, 
slightly wider than long, broadly rounded at apex; labrum blunt. Pro- 
thorax large, heavy, one and one-third times as long.as head, with a 
prominent median groove; notum not attaining lateral margins; all 
spines wanting; excepting the pair at the posterior angles. Pterothorax 
large, lateral outline convex. Legs short, stout; fore tibiz with a stout, 
obtuse tooth on inner margin of apex; middle and hind tibiz with re- 
spectively one and two long, very stout, tibial spurs on inner lower mar- 
gin of apex; anterior femora vefy large; fore tarsi with a very large, 
slightly curved, acute tooth. Wings present, not narrowed at middle. 
Male without scale at base of tube. 
This genus resembles Trichothrips Uzel in general structure, and 
should probably follow it in a linear arrangement of the genera. 
Plectrothrips antennatus sp. nov. 
Female—Length about 1.8 mm. General color blackish brown, 
fading to brownish yellow on abdomen; tube bright brownish orange. 
Head six-sevenths as wide as long, truncate in front, widest behind 
eyes, and narrowed posteriorly; lateral and dorsal surfaces very faintly 
reticulate, sparsely spinose; postocular bristles slender, pointed, their 
bases situated near the lateral margins of head, and equidistant from 
posterior margins of eyes and anterior border of prothorax. Eyes finely 
faceted, moderately large. Ocelli placed well forward; anterior ocellus 
slightly overhanging; posterior ocelli opposite anterior third of eyes and 
contiguous to them. Antenne eight-segmented; segments 2-8 sub- 
equal in length; 8 compressed, fusiform-pedicellate as seen from above, 
and with a single terminal bristle; 3, 5, and 6 provided each with two 
short, very stout, roughened sense cones, one on each side of apex; 4 with 
an additional similar cone on the outer apical surface; circular sense-area 
on segment 2 situated nearer base than usual; antenne concolorous with 
body, excepting segment 3, which is orange at base. 
Prothorax large, one and one-third times as long as head, and (in- 
cluding coxe) two-thirds as long as wide; all the usual spines lacking, 
save a single long pointed one at each posterior angle. Pterothorax 
slightly broader than long, and a little wider than prothorax; sides 
rather prominently arcuate. Wings reaching about to base of tube, 
