93 



Nematus hospis — 



Walsh, Proc. Eut. Soc. Phil. Vol. VI. 1866. p. 261. 



Norton, Trans. Amer. Ent. Soc. Vol. I. 1867. p. 218. 



Dalla Torre, Cat. Hymen. Vol. I. 1894. p. 229. 

 Nematus pomnm — 



Beutenmiiller, Bull. Amer. Mus. JSat. Hist. Vol. IV. No. 1. 1892. p. 263. 



Beutenmiiller, Amer. Mus. Jour. Vol. lY. No. 4. 1904. p. 23. 



Cook, Ohio Nat. Vol. IV. No. 6. 1904. p. 148. 

 Potania hospes — 



Alarlatt, Proc. Ent. Soc. Wash. Vol. III. 1895. p. 266. 

 Potania pomum — 



Marlatt, V. S. Dept. Agri. Div. Ent. (Tech. Ser.) No. 3. 1896. p. 36. 



This gall has recently been described by Marlatt as follows: "The 

 gall /S. pomum found on Salix cordata and very rarely on S. discolor. A 

 smooth, fleshy, globtilar. or slightly oval monothalamous gall, like a minia- 

 ture apple. 0.30 to 0..5.5-iuch in diameter, growing on one side of the mid- 

 rib of a leaf, and extending to its edge or beyond it. The principal part 

 of the gall projects from the under side of the leaf ; very rarely it is 

 bisected by the leaf. Color greenish yellow, sometimes with very rosy 

 cheeks, especially the upper surface, and often with little dots." It has 

 been reported from New Yoi'k, Ohio and Illinois. Mr. Greene's si)ecimen 

 is on S. discolo)-( ?). 



DIPTERA. 



CECIDOMYIDAE. 

 AsPONDYLiA cosPicuA Osten Sacken. 



Aspondylia rudhecJciae conspicua — 



Osten Sacken, Trans. Amer. Ent. Soc. Vol. III. 1870. p. 51. 



Beutenmiiller, Amor. .Mus. Nat. Hist. Vol. XXIII. Art. XVII. 1907, p. 

 387. 



Beutenmuller, Bull. Amer. Mus. Nat. Hist. Vol. IV. No. 1. 1892. p. 273. 

 Aspondylia conspicua — 



Aldrich. Cat. of N. A. Dipt. 1905. p. 156. 



Bergenstamm & Low, Verb. Zool.-Bot. Gesell. Wien. Vol. XXVI. 1876. 

 p. 69. 



This gall was first described by Osten Sacken as follows : "They were 

 in one case nearly round, of the size of a large apple; the other was an 



