﻿CRAWFORD. SOME NEW THYSANOPTERA FROM SOUTHERN CALIFORNIA 103 



spines on third very light colored ; sense area on distal portion of third and 

 fourth, and conspicuous sense cone on lower side of fifth near tip ; two conspic- 

 uous long spines on tip of ninth. 



Prothorax one and one-half times as wide as long, and wider than head, 

 with an emargination and thickening of wall on each side ; with several small 

 inconspicuous spines on dorsal surface. Thorax broadest across mesothorax. 

 Metathorax with sides tapering uniformly, and quite noticeably posteriorly. 

 Legs (Fig. 46 A, C, D) dark brown, except fore-tibiae, which are lighter; fore- 

 femora thickened ; fore-tibiae with conspicuous long spine on inner side near 

 the middle (Fig. 46 A) ; fore- and second tibiae with two stout spines at tip, 

 and posterior tibiae with several stouter spines at tip; fore-tarsi armed with a 

 stout hook and tooth and overreaching spine ; legs thickly clothed with con- 

 spicuous spines, and the second and posterior tibiae and tarsi with numerous 

 microscopic hairs. Fore-wings (Fig. 46 E) broadly rounded at tip and slightly 

 broadened in distal half ; with no longitudinal veins whatever, but two rows 

 of spines extending the entire length of the wing ; the anterior row is white and 

 inconspicuous, but the posterior row brown and distinct ; anterior margin with- 

 out fringe, but having a row of short spines ; posterior margin with long fringe 

 of cilia ; wings clear white with dark brown longitudinal band covering post- 

 erior half of wing, extending from near base to near tip ; microscopic hairs on 

 clear portion white, on brown portion brown. Posterior wings clear white, 

 except small brown longitudinal band near base ; without longitudinal veins ; 

 with simple fringe on posterior margin. 



Abdomen widest at seventh segment, about one-third as wide as long; 

 first segment lightest in color, the rest shading uniformly to dark brown at 

 ninth segment ; segments three to seven with dark transverse line near anterior 

 margin. One small spine on posterior angles of eighth segment, and several 

 on ninth, which bears two large articidated claspers (Fig. 46 G) ; six very 

 long and stout and several smaller spines on tip of ninth segment ; posterior 

 ventral margin of ninth segment with deep indentation, reaching one-third the 

 length of segment. 



Measurements: Head, length .17 mm., width .17 mm.; prothorax, length 

 .13 mm., width .20 mm.; mesothorax, width .25 mm.; abdomen, width (at sev- 

 enth segment) .26 mm.; total length of body 1.33 mm. Antennae: I .034 

 mm., II .051 mm., Ill .098 mm., IV .083 mm., V .080 mm., VI .010 mm., 

 VII .010 mm., VIII .08 mm., IX .09 mm.; total .38 mm. 



General color, brown ; head, pro- and mesothorax brown ; metathora.x and 

 first five abdominal segments lighter ; remaining abdominal segments shading 

 to dark brown. 



Described from one male. 



Food plant: Arteniisia. 



Locality: Claremont, Calif. (Crawford.) 



This species in general appearance is close to Acolothrips kutvanaii, Moul- 

 ton, but in having no longitudinal veins in anterior wings it not only diflfers 

 sharply from that species, but presents a slight departure from current de- 

 scriptions of the family. 



