364 
the head and prothorax are velvety-black and without luster, due no 
doubt to the microscopic reticulation. : 
At Muncie, Illinois (the only locality from which I have seen speci- 
mens) this species was very abundant upon the hop tree (Ptelea trt- 
foliata). As many as fifty individuals were frequently observed on 
the under surface of a single leaf, where their peculiar coloration 
rendered them very conspicuous. 
SuBORDER TUBULIFERA Hatipay.* 
Famity PHLG@OTHRIPIDA Uzel. 
Genus ZyGoTHRIps Uzel, 1895. 
Zygothrips longiceps sp. nov. (Fig. 2). 
Female.—Similar to Z. minutus Uzel, from which it differs as follows: 
a. Length about 1.1 mm. head about 1.1 times as long as wide, half as long as 
antenne, and about 1.4 times as long as tube. Anterior marginal spines 
on prothorax large, subequal in length 
to the others. Posterior margins of 
abdominal segments 3—7 provided each 
with two pairs of straight spines, the 
inner pair short. Tarsi light yellow, tibize 
yellowish, the first and third pairs 
clouded at base, and the second pair at 
middle, with brown or black 
Z. minutus Uzel. 
aa. Length about 1.47 mm. Head about 1.4 
times as long as wide, three-fifths as 
long as antenne, and almost twice as 
long as tube. Anterior marginal spines 
on prothorax wanting. Posterior mar- 
gins of abdominal segments 3-6 pro- 
vided each with two pairs of long spines, 
the inner pair sigmoid. Tibie and 
tarsi uniform bright yellow 
Z. longiceps sp. nov. 
The measurements of the female of 
ae, this species are as follows: Total length 
Zygothrips We, Gset head and IN eerh mim. head, length .192 mm., width 
prothorax. (J. D. H., del.) .134 mm.; prothorax, length .123 mm., 
width (including coxz) .232 mm.; ptero- 
thorax, width .234 mm.; abdomen, width .272 mm.; tube, length .102 
*The division of the Tubulifera into the two families Phleothripide and 
Idolothripide, proposed by R. S. Bagnall (Ann. and Mag. of Nat. Hist., Eighth 
Series, Vol. I., No. 4, p. 356; Apr., 1908), seems to be an unnatural one, apparently 
separating from each other species which are more closely related than the ex- 
tremes of the respective families into which they fall. 
