Hood — Neir (fcnrm and S/><rir.-< of X. A. 77/ //w noplem . (Sb 



than 1 ; 3-6 long, cylindrical, successively decreasing in length, 4 dis- 

 tinctly shorter than :'>; 7 slightly longer than 6, usually about equal to 5 

 iu length, and narrowing apically; 8 abruptly shorter, one-half to one- 

 third as long as 7 and twice to five times as long as 9, which is subconical 

 and usually about as long as wide. Segments 1-4 pale yellowish white, 

 3 and 4 slightly more whitish, 4 clouded at extreme apex with black; 



l"^r. 1. — Stomatothrips flavus gen. et sp. now 

 Female; a, maxillary and labial palpi, lateral view, x-525; 

 b, right fore wing, x93. 



5-9 uniform black. Segments :5-9 quite thickly 

 clothed with short, white, inconspicuous hairs of 

 uniform length; 5, 6, and 7 each with a short, 

 linear, pale, sensory area on ventral surface.* Mouth cone normal to the 

 group. Ventral surface of head sparsely pubescent and with two pairs of 

 prominent spines, one of which is subantennal and the other of which is 

 situated between the posterior angles of the eyes, just anterior to the 

 chitinous thickening. 



Prothorax subrectangular, slightly wider than long, and a little wider 

 than head; sides and posterior angles rounded; surface with numerous 

 very minute spines. Mesothorax broader than prothorax, anterior 

 angles broadly rounded, mesonotum transversely striate. Metathorax 

 narrowed posteriorly, metanotum nearly smooth. Wings long; fore 

 wings expanded apically, broadest at apical sixth, where they are just 

 twice as wide as at basal fourth; venation normal to the group; spines 

 on anterior portion of ring vein short, slightly projecting beyond margin 

 of wing; first and second longitudinal veins set with about 20 and 14 

 short spines, respectively. Color of fore wings pale brown, with two 

 white cross hands, one of these being a narrow one at basal seventh and 

 the other a slightly wider one at apical seventh; intermediate brown area 

 somewhat paler at middle; hind wings white. 



Abdomen subpetiolate, at sixth segment more than twice as wide as at 

 base and one and one-half times as wide as pterothorax ; posterior margin 

 of segments 1. 2, and 3 whitish; segments 9 and 10 tinged with yellow or 

 white. 



.Measurements of a female from Odin, Illinois. — Length, 1.7:! mm.; 

 head, length, .17 mm.; width, .21 mm.; prothorax, length, .2] mm.; 

 width, .L'4 mm. ; pterothorax, width, .30 mm. ; abdomen, width, .47 



* Similar areas are almost certainlj present on segments :; and I, bul I have not 

 been able to make them out on my specimens. 



