356 [May 



29. C. FORMOSA Bassett, Proc. etc. III. p. 679 ( 9 ; Q. rubra). Is 

 not this remarkable species, obtained from the gall in winter, a dimor- 

 phous female of some as yet unknown % and 9 escaping from the gall in 

 summer '( I have already made this suggestion above, page Ml. 



30. C. SCULPTA Bassett, Proc. etc. II, p. 324 ( % $; Q. rubra). I 

 have not seen this insect, nor its gall. May this not be the G. nubili- 

 pennis Harris? (compare above, No. 27). Mr. Walsh has observed on 



Q. tinctorla a gall which he considers as identical with that of 0. 

 sculpta (Proc. etc. Ill, p. 639). 



31. C. Q. phellos 0. S., Proc. etc. I. p. 70. No. 23 ( 9 ; Q. pkdlos). 



32. C. similis Bassett, Proc. etc. Ill, p. 685 (% 9; Q. ilici/olia). 

 This gall-fly is very like the preceding, and it would require a larger 

 number of specimens than I possess in order to discover permanent 

 differences. G. similis is somewhat larger, its abdomen is apparently 

 broader, its coloring somewhat darker, etc. Their galls, judging by 

 Mr. Bassett's description of that of G. similis, are also very much alike. 



33. C. Q, NIGR^E 0. S., Proc. etc. I, p. 66, No. 17 ( % 9 ; Q. nigra). 

 The gall resembles that of G. tumifica O. S. ; the gall-fly is easily dis- 

 tinguished by its coloring. 



34. C. tumifica, n. sp. ( % 9 ; Q. tinctoria ). Obtained by me from 



a swelling on the midrib of the leaves of Q. tinctoria. Most of the 



swellings were near the basis of the leaf; some of them even on the 



leaf-stalk. Cut open, they show numerous seed-like bodies, arranged 



in rows, and each containing an insect. 



C. tumifica n. sp. % 9 ■ 



9 0.09 long. Head brownish-red or yellowish-brown :•& blackish spot on the 

 vertex encloses the ocelli ; antennse 14-jointed, the last joint is much shorter 

 than the two preceding joints taken together; their color is yellowish-brown, 

 the last five or six joints are brown. Mesonotura brown, mixed with reddish in 

 suoh a way that the parapsidal grooves are on reddish ground; a space adjoin- 

 ing the scutellum is also reddish ; the surface of the mesonotum is finely, dense- 

 ly, but irregularly rugose and opaque; between the parapsidal grooves two 

 narrow, jwlished lines run from the collare a short distance backwards; scu- 

 tellum brown, deeply rugose, and therefore opaque; abdomen dark brown, 

 almost black, polished, with a microscopic punctation on the margin of the seg- 

 ments ; sheath of the ovipositor not reaching above the dorsal line of the abdo- 

 men ; feet brownish-yellow; femora and tibiaj more or less infuscated; the pos- 

 terior ones more than the foremost ones ; tarsi brownish-yellow, brown at tip. 

 Wings hyaline ; no areolet ; stout veins brown. 



A single female specimen, bred from galls found in June, near Dobb's 

 Ferry, New York, on Q. tinctoria. 



Mr. Bassett having found the same gall on Q. tinctoria and a similar 

 one on Q. rubra, communicated me the flies bred from one of them, he 



