158 PROiJEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



waA^ between these and the median line, one at middle of each side, two 

 ut each hind angle,- and one between this pair and middle of hind mar- 

 oiii. Mesothorax about one and one-third times as wide as the pro- 

 thorax, with one slender spine at middle of each side. Wings long, 

 reaching nearl.y to tip of abdomen, at middle about one-seventeenth as ' 

 broad as long, pointed at tips. Fore wing with two longitudinal veins 

 and a verv heavv ring vein; hind longitudinal vein branches from the 

 fore vein at about one-third the length of the wing. Spines upon 

 costal and botli longitudinal veins veiy long and stout, fully ecpialing 

 those upon the anal segments; costal vein l)ears from fifteen to twenty, 

 fore vein from nim^ to eleven, hind vein five or six (the third and 

 fourth spines, sometimes the second also, which 1 have counted as 

 standing upon the fore vein, stand at the same angle to the wing as do 

 those upon the hind vein and really belong thereto, though the veins 

 have united); the front fringe of the fore wings is extremely sparse, 

 short and weak, and does not extend to the tip; hind fringes also 

 unusually short. Fore wings are characterized by three light brown- 

 ish s|)ots on each — one at base of wing, one immediately beyond sepa- 

 ration of longitudinal veins, and the third halfway from the second 

 to the tip of the wing (the third is a band extending clear across the 

 wing). Legs concolorous with body, sparsely set with slender spines. 



Abdomen cylindrical-ovate, pointed at extremity, surface smooth; 

 only one spine of any prominence at posterior side angles of segments 

 two to eight; spines upon segments nine and ten not as strong as those 

 upon the wings; color nearl}" uniformly pale yellow without prominent 

 markings. 



Redescribed from ten specimens. 



Male. — Male smaller than female, but otherwise agreeing very closely^ 

 with the foregoing description. Abdomen bluntly conical at tip; tenth 

 segment partially retracted within ninth, which is cut out in last half 

 above the tenth; spines borne on top and sides of nine are shorter and 

 weaker than those on wings. 



Described from one specimen. 



Food 2)l(mU- — "Found on man}' plants infested with red spider, on 

 which it has repeatedly been observed to feed." — Pergande. "Feed- 

 ing on mites in fold of cottonwood leaf." — Rruner. Taken on bean, 

 blackberry, elm, and hop. — Beach. 



IlaUtat. — Missouri ?; Ames, Iowa; Barraboo, Wisconsin; Lincoln, 

 Nebraska. 

 • Thrqj.s ijalUda Beach is positively identical with this species, as has 

 been learned from an examination of her types. 



Genus RAPHIDOTHRIPS Uzel. 



Ocelli present. Antennse eight segmented; the fifth segment short 

 and cut off abruptly at the end so that it joins the base of the sixth by 

 an unusually ])road surface; style very slender, composed of two equally 



