1921] Wells — New United States Zoocecidia 35 



fovea punctiform ; ocellar basin broadly limited by a distinct frontal 

 crest, surrounding the median ocellus; antennal furrows obscure, 

 interrupted near middle of their length; vertical furrows deep, 

 broad, longer than broad; })Ostocellar area with a deep mesal fur- 

 row connecting with shallow inconspicuous ocellar furrow; surface 

 of head dull; mesonotum dull, indefinitely punctate or striate; 

 mesoscutellum with distinct furrows on each side, polished on 

 meson; metascutellum polished, impunctuate; mesopleura dull, 

 sparsely sericeous; cerci distinct, short, porrect; caudal margin of 

 caudal sternum rounded; wings hyaline, costa reddish, veins and 

 stigma infuscated. Lenth 8 mm. 



Habitat: Ithaca, ISTew York. No. 20-1. 



Tlie general appearance of this species, the arrangement of the 

 pale color and the line of the abdominal segments is similar to that 

 of Strongylogaster politus Prov. The difference in the coloration 

 of the abdomen will differentiate it from Tlirinax impressatus Prov. 



NEW UNITED STATES ZOOCECIDIA. 



By B. W. Wells, 



State College, Raleigh, North Carolina. 



In the descriptions below, the author has indicated in each case 

 whether the gall is a kataplasma or a prosoplasma. These terms 

 of Kiister's pertaining to the lower and higher galls respectively, 

 deserve a prominent place in gall descriptions, for they connote 

 very significant conditions. The writer has pointed out (Botanical 

 Gazette, May, 1931) that these groups have an evolutionary 

 relationship. By "kataplasma" Kiister means those indefinite galls 

 whose structure is developed through hyperplasia of embryonic 

 tissue, the end product not becoming in its differentiation, orienta- 

 tion and form of tissues, fundamentally different from the normal 

 plant part; they represent inhibitions of the normal differentia- 

 tions, the more advanced ones tlius a])])roach homogenity. "Proso- 

 plasmas," on the other hand, are definite galls whose structure 

 differs fundamentally from the normal plant ]iart. the tissues 



