THE THYSANOPTERA OF CALIFORNIA. 55 



which are light brown; each hind tibia armed at tip with a spine; all 

 tarsi with a brown spot at tip. Wi?i{/s fully developed, uniform light 

 gray-brown, all veins weak. Fore margin and hind vein set regularly 

 with conspicuous dark brown spines, about twenty-six on fore margin 

 and thirteen on hind vein; fore vein with twelve spines arranged in 

 two groups of three and four on basal half of wing and live scattered 

 spines on distal half. 



Ahdonien elongate-ovate, pointed at tip. Spines at sides increasing 

 in prominence toward tip, those on 9 and 10 largest and most con- 

 spicuous of any on body. Hairs in comb-like structure on posterior 

 margin of segment 8 closel}^ placed. 



Described from, two females. 



Food plant: Grass. 



Hahltat: Alum Rock Canyon, Santa Clara County, Cal. 



This species is very close to Etdhrips pyri . 



{VI) Euthrips ulicis californicus, new variety. (PI. Ill, fig. 27; PI. IV, 

 figs. 28-31.) 



Measurements: Head, length 0.13 mm., width 0.17 mm.; prothorax, 

 length 0.21 mm., width 0.25 mm.; mesothorax, width 0.36 mm,; abdo- 

 men, width 0.40 mm. ; total body, length 1.33 mm. Antennae: 1, 30yM; 

 2, 45yM; 3, 75/i; -^^QQid-^ 5, -18/^; 6, 66yw; 7, 15yw; 8, ISyw; total, 0.36 mm. 

 Coloi' dark-brown, except tarsi and fore tibiae, which are light brown 

 or yellow. 



Head slight!}" wider than long, deeph" set in prothorax; cheeks 

 straight, parallel; front of head broad and quite straight, having only 

 a small elevation between bases of antenna; head noticeably square in 

 front; back of head transversely striate; large spine on back of head 

 just inward from each eye, and anterior to each posterior ocellus; a 

 pair of small backwardly curved spines on apex of head; four or five 

 spines posterior to each eye, the outer one of each group being promi- 

 nent on the side of the cheek. Fyes medium, prominent, but not 

 protruding; pilose; with light inner borders, pigment deep red to 

 black. Ocelli large, separated, orange colored, with orange brown 

 crescents, posterior ones almost contiguous with light borders around 

 eyes. Mouth C6»;?(? pointed, maxillary palpi throe-segmented. Antennm 

 eight-segmented, about two and one-half times as long as head; brown, 

 unicolorous with body except segment 3, which is yellov/, and 4, which 

 is light brown; forked sense cones are fourd on segments 3 and 4 

 and a pointed sense scale set in a transparent area near tip of seg- 

 ment 6. Segments 3 and 4 constricted near their tips. 



Protlumix noticeabl}" larger than head, sides convex; a short spine 

 on each anterior angle and two long prominent spines on each pos- 

 terior angle. Mesothorax largest, anterior angles broadl}'^ rounded, 

 posterior ones slightly constricted to meet the smaller metathorax. 

 Sides of metathorax almost straight and parallel posterior angles 



