NO. 1310. NORTH AMERICAN THYSANOPTERA— HINDS. 135 



the prothorax, widest behind, sides curving forward; nietathorax 

 iil)ruptl3' somewhat narrower, and its sides curve inward to ])asc of 

 at)domen. Wings nearl}' always fully developed in females, about 

 four-fifths as long as l)ody and in middle about one-seventeenth as 

 broad as long, sharply pointed at ends, heavily fringed on both edges. 

 Hind longitudinal vein branches from the fore at about one-fourth 

 the length of the wing; fore vein bears six or seven spines before the 

 branching off of the hind vein; beyond this the fore vein bears 

 usually two and the hind vein four spines; costa bears numerous 

 short spines. Fore wings gray-brown; hind wings gray. Legs short 

 and powerful; fore femora extremely short, nearly as broad at base 

 as long, wrinkled on surface and at tip outside with chitin turned up 

 into a sort of tooth; fore tibi;v also extremely short and thick; each 

 tibia bearing a row of spines of gradually increasing length and stout- 

 ness on inner side toward tip; these are most strongly developed on 

 hind legs. Legs dark brown except tarsi more or less gray or 

 yellowish. 



Abdomen ))roader than mesothorax, hardly twice as long as broad 

 (segments usually overlapping considerably and giving a dark and 

 light brown l»anded appearance); spines around last two segments 

 moderately long and stout, dark ])rown and conspicuous; ovipositor 

 of good length. Color of abdomen uniform dark brown; recepta- 

 culum seminis inconspicuous or invisible. 



Kedescribed from ten females. 



Male. — Length 0.83 mm. (0.6(5 to 0.90 mm.); width of mesothorax 

 <K-1-1 mm. (O.L>(» to 0.24 mm.). 



Ocelli wanting; spines on head as in female. Relative lengths of 

 antennal segments as follows: 



Segments two and three pale yellowish, "Wings entirely wanting. 

 Al)domen more narrow than in female and bluntly rounded at the end. 

 Ninth segment very large, conoid; tenth segment retracted therein; 

 ninth with a short stout spine on each side of the hind edge above; 

 genital apparatus protruding beyond the tip of tenth segment; a 

 rounded light depression in middle of ventral plates on segments 

 three to six. 



Described from five males. 



F'ood phuits. — Flowers of various grasses and cereals, clover, wild 

 carrot. 



Habitat. — England (Ilaliday), Germany (Burmeister, Jordan, Bohls), 

 Finland (Renter), Russia (Lindeman), Bohemia (l^zel). United States: 

 Manchester, Iowa; Amherst, Massachusetts. 



