Larger oak apple gall, j\ m ]i h i b o 1 i p s c i> n f 1 u e n t ii s Harr. 



1 Two oalls on ;i small t\vi<;- 



Scrub oak gall, A in p li i b o 1 i p s i 1 i c i f u I i a c Bass. 



2 Two twigs bearing- the peculiar fusiform galls 



Poplar stem gall, A g r o m y y. a a c n c i v c n t r i s ]''all 



3 Several galls on twigs 



Willow gall midge, Rhabdophaga saiicis Shrank 



4 Gall with pupal skins protruding therefrom 



760 



