THE THYSANOPTERA OF CALIFORNIA. 61 



Fore femora enlarged; fore tarsi stout and each armed with a stout 

 tooth. Other than a single row of stout spines on the hind tibiae, the 

 legs bear no conspicuous spines and only a few small hairs. Wiiigs 

 reach to base of tube; both pairs equal; edges parallel; with simple 

 fringe of long, straight hairs on both margins. Fore wings double 

 fringed on posterior margin near tip b}^ seven or eight hairs. Mem- 

 brane of wings transparent, >^haded gray-brown near base. Fore wings 

 each with a single median rudimentary v^ein and center of wing along 

 vein shaded light brow^n. Base of wing bears three kno])bed hairs, 

 one long and two short ones; costal margin near base with wavy 

 thickenings. 



Abdomen about as wide as thorax, last three segments tapering 

 abruptly; tube slender and about two-thirds as long as head; terminal 

 hairs as long as tube. The abdomen is brown and red, unicolorous 

 with the thorax and head. Each posterior angle of all segments except 

 the first bears a stout, transparent, knobbed hair, these increasing in 

 length from the second to and including the ninth. Other smaller 

 hairs are also found on the prominent angles. 



Descrihed from one female; male unknown. 



Food plant: Apricot. 



Hahhiit: Santa Clara Valle}^ California. 



(^1) Trichothrips femoralis, new species. (PI. V, tig. 44; PI. VI, 

 Hgs. 45, 4().) 



MeasuremenU : Head, length 0.21 mm., width 19 mm., prothorax, 

 length 0.20 mm., width 0.33 mm. (including coxa); mesothorax 

 width 0.38 mm.; abdomen, width 0.40 mm.; tube, length 0.10 nnn.; 

 total body, length 1.7 mm. Antennse: 1, 83>w; 2, 48yu; 3, '6%)x\ 4, ^^)x-^ 

 5, BGyw; 6, 63yM; T, 63/<; 8, 48yu; total, 0.52 mm. Color uniform dark- 

 ))rown, except fore tibiji> and tarsi and segments of antennae, 3 to 6 

 inclusive, which are yellow; middle and hind tarsi light brown. 

 Orange-colored pigment may be seen in lighter colored specimens. 



Head slightly longer than wide, rounded in front; frons elevated 

 between basal segments of antennae; cheeks almost straight and 

 parallel; mai'gins roughened; back of head with Cross striations. 

 Postocular spines prominent; other small spines not conspicuous. Eyes 

 occup3"ing about one-third the length of the head, with small facets, 

 not pilose; with light, irregular, orange-tinted inner borders and light 

 lemon-yellow narrower outer borders. OceU't present, anterior one 

 on apex of head, posterior ones orange-tinted and contiguous, with 

 light inner bordei's of eyes. Mouth c<me small, no longer than width at 

 base, tip bluntly pointed; rudimentar}' chitinous thickening on either 

 side about halfwa}' between base of cone and ej^es, equall\' well 

 developed on V)oth sides. Antennie eight-segmented, slightly more 

 than twice as long as head; basal segment l)rown; 2 brown, shading to 



