44 NORTH AMERICAN THYSANOPTERA. 



General color uniform dark brown except tips of all tibiae and all 

 tarsi, which are yellowish. Wings (in the forms which have wings) 

 transparent. 



Head about four-tenths longer than wide, broadly rounded in front 

 except at vertex, which projects forward between basal segments of 

 antennae; cheeks almost straight, without markings and without 

 spines other than the long, transparent, blunt, postocular ones. Eyes 

 somewhat triangular in shape, prominent but not protruding, black, 

 with lemon-yellow outer margins, not pilose. Ocelli present, situated 

 far forward on head, each posterior one contiguous with inner 

 anterior margin of eye, slightly reddish-brown, with darker crescents ; 

 anterior ocellus smaller and with pigment, elongate and not crescent 

 shaped. Mouth-cone a little shorter than its width at base; maxillary 

 palpus two-segmented, basal segment very small, second segment 

 long; labium broadly rounded. Antennse, with eight segments, one 

 and one-half times as long as head, uniform dark brown except 

 segment 3, which is light brown and somewhat yellowish at base; 

 spines and sense cones present but not conspicuous; segments 7 and 

 8 closely joined. 



Prothorax about seven-tenths as long as head; sides (including 

 prominent coxa) diverging rapidly from the anterior margin to about 

 three-fourths the length and then abruptly constricted, the outer 

 angles thus formed broadly rounded. With three pairs of long, blunt 

 spines on fore and hind angles and one midway along sides; also 

 similar spine on each prominent fore coxa. PtertJiorax with sides 

 almost even and parallel, a little narrower than prothorax but much 

 wider than head; almost as wide as prothorax in winged forms. 

 Legs short, stout, each fore tibia with a small tooth. Wings (in 

 winged forms) very weak, hardly attaining half the length of the 

 abdomen, transparent, and hardly to be seen except for very light 

 brownish area at extreme base. 



Spines on sides of abdomen long and transparent, those on tip of tube 

 brown. 



Descrihed from two wingless and three winged females. 



Habitat: San Jose, Cal. 



Food 'plants: Wild mustard, apricot, and prune foliage. 



Adults taken from April to July. 



