35^ NEW YORK STATE MUSEUM 



cccc 24 antennal segments; the lateral tufts on abdomen not well 

 marked; lobes of ovipositor long, narrowly oval, with a 

 length 2^ times the width; bred from rosette gall on 



willow brassicoides Walsh 



bb Males, antennal segments stemmed 



c Stem of the 5th antennal segment with a length ^ of the 

 basal enlargement, males 

 d 23 antennal segments ; the 4th palpal segment y2 longer 

 than the 3d; apical processses on harpes short, broadly- 

 rounded ; length 4 mm ; lateral tufts on abdomen well 



marked; bred from pine cone gall on willow 



strobiloides Walsh, aii73, ai340, ai442, C. 1248 

 dd 22 antennal segments ; 4th palpal segment as long as the 

 3d ; the apical chitinous processes on the harpes, long, 

 subquadrate ; length 3.5 mm ; lateral tufts on abdomen 

 not well marked; bred from loose leaf rosette gall on 



willow 



•brassicoides Walsh, 31433, 31467 



ddd 23 to 25- antennal segments ; harpes broadly truncate ; 



length 4 mm; bred from large loose apical leaf gallon 



willow ? rhodoides Walsh, C. 775-77, 1247 



dddd 21 to 23 antennal segments; length 3 mm; bred fro.n 



slightly swollen willow twigs 



podagrae n. sp., 31399, ai076y 



OLIGOTROPHIARIAE 

 This group is composed mostly of rather large species which 

 may be recognized by the third vein being well separated from 

 the anterior margin, the rather short cylindric antennal seg- 

 ments, and the simple claws. 



HOST PLANTS AND GALLS OF THE OLIGOTROPHIARIAE 



The following tabulation of the known galls produced by 

 members of this group will undoubtedly prove of service in 

 identifying the various species. 



Antennaria 



Oval bud gall on A . p 1 a n t a g i n i f o 1 i a 



Rhopalomyia antennariae, C. 960 



Woolly apical galls presumably on Antennaria 



Rhopadomyia p i 1 o s a, C. 1215 



Artemisia 



Globular woolly galls about i cm in diameter 



Rhopalomyia alticola, C. 768 



