m.v.no. NORTH AMERICAN THYSANOPTERA— HINDS. 175 



extremities of tibiae pale yellowish; tarsi also yellowish, brownish 

 around tips; legs bearing quite a number of inconspicuous spines; 

 hind tibiie alone bearing stout spines at their tips. 



Abdomen broadly ovate, pointed at tip, wider than thorax. Color 

 dark brown, somewhat lighter on last two segments. Anal spinels 

 weak, especially on last two segments; the few spines on sides of seg- 

 ments two to eight are inconspicuous. 



Redescribed from one specimen at U. S. Department of Agriculture, 

 Division of Entomology. 



Male not known. 



Food plan is. — Orange leaf infested with Asjjidiotus auranUi. (Prob- 

 ably not feeding on scale.) 



Ilahltat. — Yuba Coiint}^, California. 



Life history unknown. 



Genus PARTHENOTHRIPS Uzel. 



The body, principally the head and prothorax, with deeply reticu- 

 lated structure. Head broader than long, with a hump in front between 

 the eyes; cheeks swollen, constricted into a short neck at hind edge. 

 Eves protruding; ocelli present. Antennte seven segmented, very 

 slender except the first two segments; style one segmented, hair-like, 

 as long as the sixth segment and bearing a slender hair of equal length 

 at the ti}). Upon the third to the sixth segments, separated from each 

 other, there are alwaj's two sense cones. Maxillary palpi two seg- 

 mented, the second segment being distinctly longer than the first. 

 Prothorax plainly shorter than the head, uneven, ])roadened posteri- 

 orly, with one long spine upon each hind angle. Legs unarmed. 

 Wings very broad and long, so that the}^ reach be3^ond the end of the 

 abdomen. The fore wings have the form of a "" cake-knife;" their sur- 

 face is reticulated and there appears to be only one longitudinal vein 

 and a ver}" strongly developed ring vein. The vein arising from the 

 base of the wing bends forw^ard at the first fourth of the length of the 

 wing and unites with the unusuall}^ strong ring vein from that point, 

 while the hind vein, branching from the main vein at this point, bends 

 toward the hind edge of the wing and runs parallel to it, but remains 

 distinct. The fore fringe has disappeared and its place is taken by the 

 stout costal spines. The hind vein is set with stout spines at regular 

 intervals. Beyond the first fourth the wing is somewhat narrower 

 than at the basal fourth. The front edge is nearly straight and the hind 

 edge bending forward unites with it to form a sharp point. The last 

 two abdominal segments are distincth" naiTowed in the females. The 

 spines at the end of the abdomen are weak and light. The species 

 belonging here have the power of springing. 



I have found only the species dracaense of this genus. 



