﻿168 POMONA COLLEGE JOURNAL OF ENTOiMOLOGY 



Idulothrips angusticeps n. sp. 



Average length 5.28 mm. ; general color deep black ; entire body surface, 

 including femora and tibire, finel}- reticulated. 



Head (Fig. 70 A) more than two and one-half times the width across 

 eyes ; with numerous tuberculous serrations on dorsal and lateral surfaces ; 

 with numerous short, stout spines, and two pairs of very long ones, one pair 

 in front of the posterior ocelli, and the other postocular, smaller ; head about as 

 wide posteriorly as across eyes, constricted somewhat behind the eyes ; vertex 

 produced triangularly over insertion of antennae, with the anterior ocellus on 

 the apex. Eyes moderately large, bulging, finely faceted and not pilose, pig- 

 ment yellow ; ocelli small, indistinct ; posterior ocelli not contiguous with inner 

 margin of eyes ; anterior ocellus directed forward, beyond insertion of antemise. 

 Mouthcone short, broadly rounded at tip, scarcely reaching to posterior margin 

 of prosternum ; maxillary palpi two-segmented, the basal joint very short. 

 Antennae (Fig. 70 F) almost one and one-third times as long as head, very 

 slender; two basal segments comparatively short and thick, II with a sense 

 area near tip; III-V elongate, clavate, III longest, with several long spine; 

 on apical half and one long sense cone near tip ; IV and \' with several long 

 spines and several transparent, but prominent, sense cones near tip; VI-VIII 

 fusiform; \'I and \'II with several long spines and one sense cone on each; 

 VIII with a longitudinal row of six spines, and one long spine at tip; I and 

 basal half of II concolorous with body; apical half of II and all but the tip 

 of III, basal three-fourths of I\' and basal half of V yellow; tip of III and IV 

 light brown, apical half of \' and \I-VIII dark brown. 



Prothorax (Fig. 70 A) about half as long as wide, including coxae, and 

 two-fifths as long as head ; coxae conspicuously protruding, with one stout, 

 black spine on each coxa, without, and one on posterior angles of prothorax ; 

 a few small spines on dorsal surface, and three small ones in front of the 

 coxae ; membraneous portions of prothorax conspicuous. Mesothorax dis- 

 tinctly wider than prothorax, with a few conspicuous spines ; with a faceted 

 spiracular ( ?) plate on each anterior angle. Legs long and very spiny; fore- 

 femora (Fig. 70 G, male) enlarged, prolonged posteriorly over trochanter; 

 foretibise with numerous conspicuous spines, and one extremely long one near 

 base; foretarsi (Fig. 70 D) within, with a sharp tooth, bearing two spines; 

 middle and hind legs very slender, long and spinose ; posterior tibiae ( Fig. 70 

 E) in both sexes with a long and exceptionally stout, black spine near tip; 

 meso- and posterior tarsi (Fig. 70 E) with a fringe of cilia-like spines on the 

 entire distal margin of both segments ; all bladder-like appendages easily re- 

 tractile ; femora black, tibiae brown, yellow at tip, tarsi yellow. Wings clear 

 white, comparatively short, with a long fringe on both margins ; forewings with 

 a brown longitudinal stripe in the center extending from base to middle of wing, 

 and a few spines at base of wing. 



Abdomen long and slender, widest at segments two to four ; with two long 

 spines at each posterior angle, and a few small ones on dorsal surface ; ninth 

 segment (Fig. 70 B) with several long, slender spines on posterior margin; 



