THE THYSANOPTERA OF CALIFORNIA. 51 



Segments 1 to S have each sev^eral very small hairs, segments 9 and 10 

 each with six or eight quite long, conspicuous spines. 



Described from one female. 



Food plant: Grass. 



Halntat: Campus of the Leland Stanford Junior University, Cali- 

 fornia. 



This species has many characters in coumion with the Prosopothrips 

 vejdovskyi described by Uzel.^' 



(6) Sericothrips stanfordii, new species. (PI. II, tig. 11.) 

 Measuremeuts: Head, length 0.12 mm., width 0.10 mm.; prothorax, 



length 0.13 mm., width 0.21 mm.; width of abdomen 0.36 mm; total 

 body, length 1.25 mm. Antenna?: 1, 21//; 2, 36yu; 3, 36//; -i, 39//; .5, 

 33//; 6, 48//; 7, 9//; 8, 15//; total, 0.21 mm. Color brown, tips of tibite 

 yeHow, tarsi yel'low, with brown tips. 



//e«c7 rounded in front, cheeks almost straight, roughened; surface 

 of head cross-striate almost to a reticulation; a spine just inward from 

 and two or three posterior to each eye; none, however, are prominent. 

 Eyes medium, with light-colored inner and outer borders; slightly 

 pilose, not protruding. Ocelli absent. 2foiith-<:oiie broad at base, blunt 

 and dark-brown at tip; maxillary palpi three-segmented. Antennse 

 eight-segmented; twice as long as head; l)rown, segment 3 light brown. 



Prothora.e bears no prominent spines and l)ut few short inconspicu- 

 ous hairs; sides slightly arched; surface faintly cross-striate. Meso- 

 thora.f^w^ metathorax resemlde abdominal segments; the mesothorax is 

 the smaller; the^^ bear no conspicuous spines or hairs; cross-striate on 

 upper surface. Color uniform brown with rest of body. No irlngs 

 are present. Le(j.s medium stout, third pair armed with spines; tips of 

 tibife 3'ellow, tarsi 3 ellow, each with a conspicuous brown spot at tip. 



Ahdonien dark brown, with light-colored bands on posterior edges of 

 all segments excepting last two; these l)ands have small longitudinal, 

 wavy thickenings; intersegmental membrane light brown or yellow. 

 Body elongate-ovate; third, fourth, and fifth segments largest, taper- 

 ing gradually to tip (segments cross-striate, especially on their ante- 

 rior parts). Segments 1 to 7 each with several regularly placed small 

 hairs; on last three segments, and especially on the last two, these 

 hairs become quite strong, prominent spines. 



Descrihed from four females. 



Food plant: Grass. 



HaMtat: Campus of the Leland Stanford Junior University, Cali- 

 fornia. 



4. Genus HELIOTHRIPS Haliday. 



(7) Heliothrips haemorrhoidalis Bouche and (JS) H. fasciatus Pergande. 

 For descriptions of these two species see Hinds's Monograph of the 



Thysanoptera of North America, pages 168 and 171, respectively. 



«Monographie <ler OnlnunLr Tliysanoptera, page 166. 



