THE THYSANOPTERA OF CALIFORNIA. 67 



Protfiornx small, about as long- as width of head; sides straight, but 

 extending outward posteriori}', with a prominent l)lunt spine on each 

 hind angle; the protruding- fore coxjfi form what appear to be the 

 prominent angles. Pterthora'x hardly as wide as abdomen, sides 

 almost straight, narrowed abruptly in front, graduall}' l)ehind. Legs 

 long and slender and unicolorous with body; foreeoxa^ greatl}- enlarged. 

 ^V'liujx extending to seventh abdominal segment; both pairs alike, clear 

 white and with long simple'fringe on both anterior and posterior mar- 

 gins, excepting fore wings at tips, which are double fringed behind by 

 al)out six hairs. 



Ahdonten long and slender; it tapers gradually from second to 

 eighth segments; the ninth segment is small; the tenth, the tube, is 

 very small and slender. Hairs on prominent angles of segments 7, 

 S, and 9 long and slender; several long and several shorter ones on 

 end of tube. Protruding scales on last abdominal segments of males. 



Jlales similar to but usually somewhat smaller than tiie females. 



Redesc7'!hed from many specimens. For original description see 

 Entomological News, 1904:, page 298. 



This thrips has been found almost exclusively under the old shells 

 of the brown apricot scale {Lecan.hiin aniieniacmn Craw) and the 

 black scale {Satssetla olese Bern.) and probaljly feeds on the remains of 

 the old scales. 



Ilahlfat: Central and southern California. 



LIST OF CALIFORNIA THYSANOPTERA AND THEIR FOOD PLANTS. 



Species. Food plants. 



(1) Orulhrips kellogyii, new species Manzanibi and niadrona blossoms. 



(2) ^Eolothrips kuwanaii, new species California lilac {Ceanothus thyrsi floras). 



(o) .EolotJirips kuwanaii, yeiriety rohustus. (Fonnd on apricot tree.) 



( 4 ) Sericothrlps apteris Daniel G rass. 



(5) Sericothrips reticulatus, new species.. Grass. 



(6) SerirotJirips stanfordii, new species Grass. 



{7) Heliothrips Itsemorrlioidalis Bonch(^ Azaleas, ferns, dahlias, cherry laurel, 



lanrestina. 



(8) Ileliothrips fasciatus Pergande Oranges, pea vines, wild vetch. 



(9) Euthrips orchldii, new species Orchids. 



(10) Euthrips pijri Daniel Apricots, aj^ples, almonds, cherries, figs, 



grapes, pears, prunes, plums, walnuts. 



(11) Euthrips rlirhornu, new species Grass. 



(12) Euthrips ulicisccdifornicus, new variety Vetch. 



(13) Euthrips minutus, new species Grass. 



( 14 ) Euthrips occidentalis Pergande Most wilil and cultivated flowers. 



{\b) Eullirips tritici Y'ltch. Grass, alfalfa, California sage {Artcinisid 



calif ornica) , manzanitas ( especial h' ^trc- 

 tostuphylos tomeniosa), oranges, roses, 

 lilacs, etc. 



( 16) Parthenothrips dracxnse Heeger Dracpena. 



(17) T7/7-ips macZroni*, new species Blossoms of madmna, California laurel, 



and California lilac. 



