THE THYSANOPTERA OF CALIFORNIA. 53 



Prothorax almost twice as wide as long, all angles broadly and 

 evenl}" rounded; a prominent line across the posterior part which 

 might easily be mistaken for the hind margin; with two short and 

 quite stout spines on each posterior angle; all spines light colored and 

 not readily seen. Memtliovax largest, sides of metathora.c almost 

 parallel and ver}" slightly arched. Legs uniform light j-ellow; all 

 tibife with a spine at tip, hind tibife with a row of regularly placed 

 spines on upper inner side; all tarsi with a brown spot at tip. Wiikjh 

 present and fully developed; fore wings light brown, with two white 

 areas, one near base and one at tip. A single rudimentary vein at 

 base of each fore wing; spines of wing few and scattered, except two 

 groups of three each near base and five on scale; wing broadest at 

 base, anterior margin ))owed, posterior margin straight from base to 

 near tip, where it curves forward to form a scythe-like tip: both 

 anterior and posterior fringes long and sparse. 



Abdomen ovoid, tip conical, segments 9 and 10 drawn out, and 

 spines on these last two are long and prominent. 



Deser'ihed from four females. 



Specimens collected from orchids in greenhouse, Fruitvale, Alameda 

 County, Cal.. by Mr. O. E. Brenmer. 



(10) Euthrips pyri Daniel. (PI. Ill, tigs. 19-24.) 



Measurements: Head, length 0.13 mm., width 0.15 mm.: prothorax, 

 length 0.13 mm., width 0.2 mm. ; mesothorax, width 0.28 mm.: abdo- 

 men, width 0.31 mm. ; total length 1.26 mm. Antennje: 1, 33/^; 2, 45/^; 

 3, 63yu; 4, 54/^; 5, 33/<: 6, 66//: 7, 9yu; 8, 12yM; total. 0.31 mm. CoJor 

 dark brown, tarsi light brown to j^ellow. 



Head slightly wider than long, cheeks arched, anterior margin angu- 

 lar, back of head transversely striate and bearing a few minute spines 

 and a pair of very long prominent spines between posterior ocelli. 

 Eyis prominent, oval in outline, black with light borders, coarsel}^ 

 faceted and pilose. Ocelli are approximate, yellow, margined inwardly 

 with orange-brown crescents, posterior ones approximate to but not 

 contiguous with light inner borders of eyes. MoatJi-vone pointed, 

 tipped with black; maxillary palpi three-segmented; labial palpi 

 two-segmented, basal segment very short. Antennx. eight-segmented, 

 about two and one-half times as long as head, uniform brown except 

 segment 3, which is light brovvn: spines pale: a forked sense cone on 

 dorsal side of segment 3, with a similar one on ventral side of seg- 

 ment 4. 



Prothorax about as long but wider than head: a weak spine at each 

 anterior and two large, strong ones on each posterior angle: other 

 spines are not conspicuous. Mesothorax with sides evenly convex, 

 angles rounded; metanotal plate with four spines near front edge, inner 

 pair largest. The mesonotal and metanotal plates are faintly striate. 



