THE THYSANOPTERA OF CALIFORNIA. 43 



(B) Family Thripid.e — Continued. 



2. Antennae with seven segments. 



a. Fore wings broad, reticulated and without front fringe. 



(6) Genus Purtlienothrips Uzel. 

 a\ Fore wings narrowed near tip; fringe present on anterior margin. 



(7) Genus Thrips Linnaeus. 



(C) Family Phloeothkipid^. 



1. Head about as long as broad (8) Genus TricholJirips Uzel. 



2. Head markedly longer than broad. 



a. Fore femora armed with tooth at tip (9) Genus Acantholhrips Uzel. 



a^. Fore femora without such tooth. 



b. Head more than twice as long as wdde; males with prominent 

 clasping organs projecting from the side of sixth segment; very 



large thrips (10) Genus Megalotliri2)S Uzel. 



y. Head about one and one-half times as long as wide; males without 

 such clasping organs ( 11 ) Genus Cryptothrips Uzel. 



KEY TO THE SPECIES. 



1. Genus Orothripsf, new genus. 



Represented Ijy one species { 1 ) 0. kelloggii, new species. 



2. Genus JMothrips Haliday. 



Represented by one species and a variety (2) A. kuwanaii, new species. 



(3) ^i. kuwanaii robustus, new variety. 



3. (Tenus Sericothrips Haliday. 



a. Body very dark brown, nearly black; pterthorax yellow; legs brown. 



{i) S. apteris Daniel. 



b. Body uniform l)rown; surface of body strongly reticulated; legs yellow. 



(5) S. reticulatus, new species. 



c. Body and legs uniform brown; four stout spines on the dorsal side of seg- 



ment 9 (6) /S'. sianforclii, new species. 



4. Genus Ileliothrips Halida}'. 



a. All legs yellow; antenna? twice as long as head; wings slender, with one dis-. 

 tinct longitudinal vein in center; small darkened area near 

 base. Food plants are azaleas, laurestinas, dahlias, etc. 



(7) If. hsemorrhoidalis Bouche. 

 6. Legs brown, with tips of femora, both ends of tibiae, and tarsi light-brown to 



yellow; antennae one and one-half times as long as head; wings 

 gray-brown with two transparent-white cross-bands, one at 

 base and one at three-fourths the wings' length; two longitu- 

 dinal veins, the second branching from the first near the 

 broadened Vjase of the wing, the first uniting with the costa to 

 form the fore part of a strong ring vein. 



(8) H. fd.'^riatu.^ Pergande. 



5. Genus Eutlirijj.t Targioni-Tozzetti. 



a. AVithout prominent spines on fore angles of prothorax; longitudinal veins 

 not regularly set with spines. 

 h. Head noticeably wider than long; sense cones on segments of antennae 

 very long and slender; general color of body light lemon-yellow. 



(9) E. orclddii, new species. 

 b'. Head about as wide as long; general color of body brown. 



c Basal segment of antenna concolorous with head and with segment 2; 

 jjostocular spines wanting; two spines on posterior i)art of 

 thorax dividing the hind margin into equal portions; about six- 

 teen spines on hind vein of fore wing; general color brown 

 to dark brown (10) E. pyri Daniel. 



