DESCRIPTIONS OF NEW GENEEA AND SPECIES. 39 



Prothorax only a little wider than head, sides arched, all angles 

 rounded ; with scattering spines, three on either side along posterior 

 margin, brown and conspicuous, the central one of each group largest; 

 sides of prothorax constricted in middle. Legs, especially posterior 

 pair, rather long and slender, covered with numerous hairs, unicolor- 

 ous mth body. Fore wings broadest in basal one-tliird, pointed at 

 ends; ring vein prominent, fore longitudinal vein conspicuous only 

 at base; with about twenty spines along anterior margin; five or six 

 spines on basal part of fore longitudinal vein, the outer two separated 

 from the others; three spines on outer half of wing where fore vein 

 should be and three spines near posterior margin where posterior lon- 

 gitudinal vein should be. Fringe on wing on both anterior and 

 posterior margins long only on outer half of wing. Wings brown, vnih 

 inconspicuous, hght, longitudinal area extending from base to tip. 

 Abdomen rather long and slender, spines conspicuous only on last 

 two segments; a combhke structure on posterior margin of segment 8. 



Described from numerous specimens. 



Habitat: San Francisco, Cal. 



Food 'plants: Taken on various hothouse plants, especially on 

 Catliartica sp ? 



Adults and larvae collected during June and July. 

 (42) Euthrips albus new species. (PI. Ill, figs. 20-22 ; PI. IV, fig. 30.) 



Measurements: Head, length 0.12 mm., width 0.12 mm.; pro- 

 thorax, length 0.12 mm., width 0.16 mm.; mesothorax, width 0.23 

 mm.; abdomen, width 0.25 mm.; total body, length 1 mm. 



Antennae: 1, 15 ft; 2, 30 //; 3, 48 fi; 4, 45 fi; 5, 33 pt; 6, 54 /z; 

 7, 9 //; 8, 12 /z; total length 0.25 mm. 



Color translucent wliitish, segments 4 to 8 of antenna brown. 



Ilead about as wide as long, noticeably square, cheeks straight and 

 very slightly arched; front angular; spines, except a pair between 

 eyes, weak. Eyes prominent, black, with light outer borders, 

 coarsely faceted. Ocelli wanting. MoutTi-cone long, pointed, tipped 

 with black; maxillary palpi three - segmented. Antennse eight-seg- 

 mented, about twice as long as head, segments 1 to 3 inclusive 

 whitish, 4 brown, wliitish at base, others brown. Forked sense cone 

 on dorsal side of segment 3, and a similar one on ventral side of 

 segment 4. 



Prothorax somewhat wider than long. A very weak spine at each 

 anterior angle. A pair of prominent ones on each posterior angle. 

 Mesothorax largest; front angles rounded. Legs unicolorous with 

 body. Spines prominent only on hind tibise, each tarsus with a black 

 spot at end. Wings present, rather broad, and tapering gradually 

 from base to distal end; not sharply pointed at tip; costa of fore 

 wings set rather sparsely with about twenty spines; fore vein with 

 six spines near base of wing and two near tip. Hind vein with nine 



