NO. 1310. NORTH AMERICAN THYSANOPTERA— HINDS. 167 



only one and three-sevenths times as long- as the head, approximate at 

 base, composed in the t^'pical form of eight segments of following- 

 relative lengths: 



Segment one is ])roa(lly rounded; two has an unusually constricted 

 basal stalk, though it is broader than that of three; three to tivo l)ear 

 each one (juite slender sense cone on outer angle, and six has one on 

 inner side lieyond the middle; spines and sense cones upon all segments 

 pale and inconspicuous. Antenna? concolorous with head at base, but 

 shading outwardly gradually to brown-black at tip. 



Prothorax slightly shorter than head and a little broader than long; 

 smooth and without spines. Pterothorax a little broader than protho- 

 rax, without spines or traces of wings. Legs short and thick, all 

 nearly equal in length, concolorous with body; tarsi tipped with brown 

 within. 



Abdomen unusually long and slender, nearly three and one-half times 

 as long as its greatest diameter, about twice as wide as head, nearly 

 cylindrical to eighth segment, then tapering to a point at tip. No 

 spines upon abdomen except around segments nine and ten; these are 

 quite short and slender and stand out nearly perpendicularly to the 

 surface upon which they are borne. Extreme tip of ten shoded very 

 dark brown. 



Kedescribed from three specimens. 



Males unknown to me. According to Halida\', they are clear yel- 

 low, and the satiron-yellow spermaries show through the abdominal 

 walls. The ninth abdominal segment bears two spines in the middle 

 above, not far from the hind edge. 



Var. cotDiatticorniH TJzel. — This variety agrees ver}^ closely with the 

 typical form except that the antennae have onh^ six segments; the 

 relative lengths of segments are as follows: 



12 3^5 ^ 



5 7 7 6.5 6 16.3 



The sixth, seventh, and eighth segments are grown together into one 

 compact sixtli segment of an elongated conical form. The abdomen 

 may be a little shorter in proportion and broader. 



No males have been taken. 



This species appears to be surely Aj_)t. rufus Gmelin, but it is larger 

 and ditiers in some other respects. 



Food planU. — Various grasses and in turf. 



Ilahitat. — England (Haliday), Russia (Lindeman), Sweden (Tr3'bom), 

 Bohemia, Germany, Helgoland (Uzel), Finland (Reuter), United States: 

 Amherst, Massachusetts. 



Life historj' unknown. 



