NO. 1310. NORTH AMERICAN TIIYSANOPTERA— HINDS. . 158 



three. Four, and live pulo yellowish; apieal parts shadino- quite 

 abruptly to light brownish; six unit'ornil}' brown; style slighth' 

 lighter than six. Spines upon antennal segments, especially two to 

 four, are unusually stout and prominent. 



Prothorax nearly one and one-third times wide as long; color 

 intermediate between that of head and pterothorax. One pair of 

 prominent, stout spines at each angle; one short anteriorly directed 

 spine close to the lower one of each fore pair; a row of live small 

 spines (the fourth is stoutest) stands on each side of hind margin 

 between pair at angle and median line. Anterior angles of mesotho- 

 rax rounded; metathorax slightW narrower than mesothorax. its sides 

 nearly straight and parallel; mesonotal plate bears one stout spine at 

 each lateral angle and two pairs of small spines on posterior margin; 

 metanotal plate bears two pairs of spines close to anterior edge, the 

 middle pair being much the stouter; color of pterothorax bright 

 orange. Wings very slightlj^ yellowish; ])oth longitudinal veins 

 extend from base to tip of wing; both internal and the costal veins 

 bear very stout, brown spines set at regular intervals; costa twenty- 

 four to twentj-six, fore vein nineteen to twenty-two, hind vein fifteen 

 to eighteen, scale five, internal on scale one. Fringe upon costal edge 

 is very light, that upon hind edge is long and wavy; cross veins can 

 sometimes l)e seen between the longitudinal veins and between the 

 fore and costal veins at about tw^o-fifths their length from base and 

 sometimes a third at about four-sevenths between the fore and costal 

 veins. Legs uniformly concolorous with head, bearing numerous 

 small spines; a pair of strong spines at inner side of tip of each tibia. 



Al)domen elongate-ovate in outline, conical at apex; a transverse, 

 narrow, brown band extends across anterior part of segments three to 

 se\-en; brownish tinge on abdomen fades behind sixth segment leaving 

 only the apex of the cone brown; a group of three or four stout spines 

 stands upon each side of segments two to eight; terminal spines long, 

 stout; all spines brown. 



JI(i/(/. — Length al)out 0.65 mm.; width about o.lT mm. Lighter in 

 color than the females; nearly a uniform lemon yellow, slightly darker 

 on throax; form more slender; apex of abdomen blunt, terminated on 

 sides by two pairs of long, stout, inward curving spines; ninth seg- 

 ment also bears two pairs of very long, stout spines near its posterior 

 border and near the dorsal line on this segment is a pair of short 

 spines; the brown bands across the abdomen of female are wanting in 

 males and they have fewer spines on sides of segments; the l)right 

 orange- colored testes are ver}- prominent. 



Food plants. — Apricot, orange, potato, and various weeds. 



Ihihifot. — California. 



liedescri])ed from specimens at the U. S. Department of Agriculture, 

 Division of Entomology — presumably types. 



