Vol. xxvii] ENTOMOI,OGICAL NEWS. 129 
lengths of the antennal segments, especially the greater length 
of the fourth, in the relative dimensions of prothorax, head 
and abdomen, in the shape of the abdomen, and in the long 
hairs on the tube. From A. variabilis Crawford it differs in 
its smaller size, in the sharp tips of the post-ocular bristles, 
the longer mouth cone, the shorter antennae, relative size of 
head and prothorax, shape of pterothorax, the weak spines of 
the abdomen, and the relative lengths of the antennal seg- 
ments, especially the fifth. 
The following key (modified from that of P. R. Jones, U. 
S. Bur. Ent., Tech. Series, Bull. No. 23, pt. I, 1912) will enable 
one to separate the North American species of Anthothrips. 
1. Postocular spines wanting; antennae almost uniformly brown except 
segment 3 and base of 4, which are light brown....A. iger, Osborn 
2. Postocular spines well developed. 
a. Postocular spines and most of those on the postero-lateral mar- 
gin of abdominal segments knobbed........ A. flavipes, Jones 
aa. Postocular and abdominal spines not knobbed. 
b. Apex of femora with a small, anteriorly directed, tri- 
angular tooth within; antennae uniformly brownish 
lackwie i shiceres sthometo es oerre Seid dee A. nigricornis, Jones 
bb. Apex of femora without such tooth. 
c. Segments 3 to 6 of antennae bright yellow, ab- 
dominal spines (except those of the tube) 
slender and rather faint..4. verbasci, Osborn 
cc. Segments 3 to 6 of antennae light brown, ab- 
dominal spines stout and conspicuous, 
A. variabilis, Crawford 
ccc. Only segment 3 of antennae wholly bright 
yellow; abdominal spines short and inconspicu- 
OlIS nec eer miei eee A. floridensis, n. sp. 
Liothrips flavoantennis n. sp. (Plate VI, figs. 7-9). 
2 —Measurements.—Total body length, 1.8 mm. Head, length 0.24 
mm., width 0.185 mm.; prothorax, length 0.14 mm., width 0.31 mm.; 
mesothorax, width 0.365 mm.; abdomen, width 0.41 mm.; tube, length 
0.19 mm., width at base 0.072 mm., at the end 0.038 mm. Antennae: 
epmcin i a7 21505; 3, 805 4,:74.5; 5,635. 0,1543 75 525 8,38, ame 
crons; total length 0.4 mm. 
Color uniformly dark brown except the antennae. Head nearly one 
and one-third times as long as wide, sides slightly arched, widest a 
short distance behind the eyes, converging slightly behind; warts on 
the cheeks small and with small short spines, surface of the head show- 
ing rather faint cross striations, postocular spines long, stout, knobbed 
