1936] New Thysanoptera from the United States 7 
thirds as long as head, and (inclusive of coxae) about 1.8 
times as wide as long, with a short vestigial internal median 
thickening and a nearly straight thickening across posterior 
fourth, between posterior marginal setae, this line bearing 
a pair of minute setae (30q apart) at middle; most of dorsal 
surface faintly subreticulate; epimeron not or only slightly 
fused with pronotum ; anterior marginal setae very minute, 
the others long, dilated and obliquely truncate at tip, the 
epimeral 46q and longest, the others 32-34p, coxals dilated 
apically but minute (13p) . Pterothorax slightly wider than 
prothorax; mesonotum with faint anastomosing lines over 
whole surface, these generally forming transversely elon- 
gate areas; metanotum polygonally subreticulate. Legs 
normal, fore tarsi with a small slender tooth ; all femora and 
tibiae distinctly reticulate and thus roughened in appearance. 
Wings short and pad-like, not attaining base of abdomen, 
fore pair with a single seta comparable in size and structure 
with posterior marginals. 
Adorn en large and heavy, about 1.6 times as wide as pro- 
thorax across coxse, polygonally subreticulate in terga I-IX, 
except median portion of the last, distal portion of II-IX, 
and basal to the dark line across III-VIII ; reticulation of I 
somewhat coarser than that of metanotum or of the other 
terga, the lines at sides of II and across middle of other terga 
minutely asperate ; all major setae at sides of segments I-VIII 
similar in form to postoculars and prothoracics, i.e., moder- 
ately stout, expanded and obliquely truncate apically, this 
giving them a somewhat golf-club-like form when seen from 
the proper direction, the lateral setae on VII 60q, on IX 107q, 
dorsals on IX (76p) scarcely hooked, terminal setae pointed, 
77p. 
Measurements (mostly of paratype,* $ ) : Length about 
1.3 mm. (fully distended, 1.4 mm.) ; head, length 0.213 mm., 
width across eyes 0.140 mm., width at posterior margin of 
eyes 0.125 mm., width at middle of cheeks 0.157 mm., width 
near base 0.130 mm. ; eyes, length 0.047 mm., width 0.037 
mm., interval 0.070 mm.; ocelli, diameter 0.015 mm., inter- 
*In order that the coloration of the holotype might be preserved, it 
was deemed better to macerate the topotypic paratype in NaOH and 
to measure it. Accurate measurements are possible only in specimens 
so treated and then mounted to float free in balsam, without cover- 
glass pressure. 
