238 GENUS ALLOTRIA 



hyaline ; radial cellule twice as long as broad ; nervures pale yellow. 

 Antennae a little longer than the body; the second joint thick, oval, a 

 little more than one-half longer than the third ; fourth a little longer 

 than the second ; the joints become gradually thicker towards the apex. 

 The scutellum, median segment, and base of abdomen covered with 

 longish white pubescence, the rest of thorax and head sparsely pilose. 

 Length 1 1 mm. 



Kilpatrick Hills, Clydesdale. Bred from a black 

 aphis found in the galls of Euura pentandrde on Salix 

 pentandra. 



Genus ALLOTEIA. 



Allotria, Westwood, Mag. of Nat. Hist., vi, 494. 

 Xystus, Htg., Germ. Zeit., ii. 



Nephycta, Foerster, Verh. z.-b. Ges. Wien, xix, 338. 

 Alloxysta, Foerster, 1. c., 338 and 340. 

 Pezophycta, Foerster, 1. c., 338 and 339. 



Mesonotum and mesosternum without furrows ; radial cellule closed 

 or open, areolet usually incomplete ; the third, fourth, or fifth joint 

 of antennae in $ sinuated. 



Differs from the preceding genus in the thorax 

 having no furrows. Nephycta agrees in every respect 

 with Allotria except in having the wings abbreviated. 



I. RADIAL CELLULE CLOSED (= Allotria, Foerster). 

 A. Wings fully developed. 



(a) Abdomen at apex obliquely truncated; abdominal 

 segments not connate. 



Synopsis of Species. 



1 (9) Thorax (and head) more or less red. 



2 (3) Thorax entirely red ; wings large, antennae and legs entirely 



clear yellow. Megaptera. 



3 (8) Thorax not entirely red, antennas not entirely yellow. 



4 (5) Pleurae entirely, and base of abdomen broadly rufous ; legs 



clear yellow ; nervures yellow ; antennae with the apical 

 three-fourths dark fuscous. Pleuralis. 



5 (4) Pleurae not entirely, and base of abdomen but slightly rufous ; 



nervures fuscous. 



