Vol. XXVli] ENTOMOLOGICAL NEWS. 



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. variabiUs 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. nigcr, 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 



black , 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- 

 ous A. floridensis, n. sp. 



Liothrips flavoantennis n. sp. (Plate VI, figs. 7-9). 



9. 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: 

 Segment i, 27; 2, 56; 3, 81 ; 4, 74-5; 5- 63; 6, 54; 7, 52; 8, 33 mi- 

 crons; total length 0.4 mm. 



Color uniformly dark brown except the antennae. Head nearly one 

 and one-third times us 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 



