Noiaio. NORTH AMERICAN THYSANOPTERA— HINDS. 155 



prominent spines; posterior edge nearly straight for one-third the 

 width of the segment; metathorax narrows abruptly after the anterior 

 edge till narro^\'er than prothorax, then sides run nearly parallel to 

 abdomen; mesonotum with two pairs of spines near anterior edge, the 

 outer one of each pair being much less stout than the inner one; meso- 

 thorax and metathorax together not longer than the prothorax. Wing-s 

 reduced, barely reaching to the first abdominal segment; pads set with 

 several stout spines. Legs of medium length and of moderate size, 

 quite thickly set with short bristles, concolorous with, or usually 

 lighter than body; bases of posterior femora and inner sides of 

 posterior tibial more yellowish; thorax colored nearly like head. 



Abdomen one and one-half times as wide as the mesothorax (short- 

 winged female) and twice as long as broad, or nearly twice as long as 

 head and thorax together; elliptical in outline except that apex is 

 conical; broad, dark bands cross the abdomen at the anterior edge of 

 dorsal plates on segments two to eight. Each segment except one and 

 ten l)ears two or three short, stout spines on sides; in addition to 

 these nine bears a circlet of eight unusually long, strong spines, and 

 ten also bears a circlet of six long spines though these are somewhat 

 shorter than those on previous segment. Segment ten is split open 

 above; color of abdomen yellowish brown to brown-black, usuallj'^ con- 

 siderably darker than head and thorax; segments usually more or less 

 telescoped. 



Described from eighteen short winged females tsiken in hibernation 

 in Februar}' and November. 



( htyjX'.—Cnt. No. 6328, U.S.N.M. 



Food plant. — Grass ? 



Ilahitat. — Massachusetts, 



Life history unknown. 



EUTHRIPS NERVOSUS (Uzel). 

 Plate III, figs. 33, 34; Plate IV, fig. 35. 



Plii/sopus nervosa Uzel, Monographie d. Orel. Thysanoptera, 1895, p. 102. 

 Thrrps {Euihrips) maidis Beach, Proc. Iowa Acad. Sciences, 1895, III (1896), 

 pp. 219, 220. 



Female. — Length 1.33 mm. (1.22 to 1.39 mm.); width of meso- 

 thorax 0.32 mm, (0.28 to 0.34 mm.). General color dark yellowish 

 1)ro\vn. 



Head somewhat pentagonal in form, not as long as wide; cheeks 

 straight and converging slightly posteriorly; front broad and obtusely 

 angular; back of head transversel}" wrinkled and bearing a few minute 

 spines. Eyes rather small, black with light yellow borders, rounded 

 01" oval in outline; ocelli yellow, widely separated, posterior ones con- 

 tiguous with light borders around eyes; one very long slender spine 

 ou each side midway between ocelli. Mouth cone pointed, tipped 



