378 The Ohio Naturalist. [Vol. XV, No. 2, 



Fig. 3. Salix longifolia affected by the gall-gnat Rhabdophaga 

 brassicoides Walsh; 



Cecidomyia salicis-brassicoides Walsh. Proc. Ent. Soc. Phil. 111:577. 

 Cecidomyia brassicoides Beutenmueller. 

 Stebbins, Bull. 2 Springfield Museum :11. 



Twig-gall, evident as telescoping of terminal twig-structures, 

 with abnormal down-production, and great broadening of leaves, 

 whole extending back 10 cm. or more. Frequent. 



Fig. 4. Salix longifolia affected by the gall-gnat Rhabdophaga 

 strobiloides O. S. 



Cecidomyia strobiloides Osten Sacken, Mon. N. A. Dipt. pt. 1:203. 

 Cecidomyia salicis-strobiloides Walsh. 

 Stebbins, Bull. 2, Springfield Mus.:ll. 



Terminal bud-gall, showing as a rounded conical mass of 

 closely appressed scale-like leaves. Green, with a whitish silky 

 covering. 2.5-3 x 4 cm. Usually abundant, but scarce this year. 



Fig. 5. Salix sp. affected by a saw-fly, probably Crypto- 

 campus nodus Walsh. 



Eiiura salicis-nodus Walsh. Proc. Ent. Soc. Phil. VI:253. 

 Cryptocampus salicis-nodus Rohwer. 

 Stebbins, Bull. 2, Springfield Mus.:12. 



Twig-gall, being a spindle-shaped enlargement of the herba- 

 ceous or young woody twigs, concentric with the stem as a rule, 

 about 1 cm. in diameter, and ranging up to 3.5 cm. in length. 

 Color that of normal twig. 



'^fc.* 



Fig. G. Salix longifolia affected by the saw-fly Pontania 



pomum Walsh. 



Nematiis salicis-pomum Walsh. Proc. Ent. Soc. Phil. VI:255. 



Nematus pomum Beut. 



Cook, Appendix to Ins. Galls Ind.:5. 



Leaf-gall, spherical to spherical constricted, on lower surface, 

 and projecting slightly through. 5-10 mm. diameter. Color 

 ranging from light green to red, depending upon light relation. 

 Minute cork-specks frequently present. Very common. July 1st. 



Fig. 7. Salix longifolia affected by the saw-fly Pontania 



desmidoides Walsh. 



Nematus salicis-desmidoides Walsh. Proc. Ent. wSoc. Phil. VI:257. 

 Nematus inquilinus Walsh. 

 Pontania inquilina Marlatt. 

 Cook, App. Ins. Galls Ind.:5. 



Leaf -gall, flattened bean-shaped, bisected b}^ leaf, usually 

 centered on a lateral vein, one to several galls on a leaf. 5-S mm. 

 long, 4-5 mm. broad and thick. Color various, usually crimson. 

 Abundant in a restricted area. July 23. 



