52 [October 



of the subcostal vein; the second transverse vein is then short and fre- 

 quently angular; the radial area is elongated. In the second section, the 

 areolet is beyond the tip of the subcostal vein; this makes the second 

 transverse vein longer and more oblique and that the radial area more 

 or less triangular. The areolet is frequently indistinct, sometimes absent. 



The hasal vein of Hartig or ihe first transverse vein of Fitch, is a stout, 

 always very distinct vein near the base of the wing, starting from the sub- 

 costal and running a certain distance across the wing. The cubitus is a 

 pale, frequently obsolete vein, which starts from the hasal vein touches 

 the areolet and disappears long before reaching the posterior margin. 



The last longitudinal vein, nearest to the posterior margin. I call the 

 anal vein. 



The literature of the North American galls is not abundant. Bosc 

 was the first who described 16 galls from Carolina as stated by Mr. West- 

 wood (Introd. II, p. 131). Having been unable to find the work of Bosc 

 in this country, I made an efi'ort to obtain an abstract from Europe; but 

 thus far I have failed. 



Dr. Harris, in his Treatise on the Insects of New England injurious to 

 vegetation, has described the galls of C^nips confluens, C. nulilipennis, 

 and C. seminator. 



Dr. Fitch (Reports etc. Vol. II) described and figured quite a number 

 of oak-galls, illustrating them in his usual popular and highly attractive 

 manner. 



All the galls, described below, have been found in the environs of Wash- 

 ington, unless otherwise mentioned. Besides the gall-flies {Psemdes, In- 

 quilinx, and Parasites^, numerous other hymenopterous parasites have been 

 reared from the galls; but their description is reserved for some future oc- 

 casion. 



The number of galls recorded in this paper can be but a very incon- 

 siderable fraction of the total number of the oak-galls of this country; and 

 the history of many of these even is but imperfectly known. 



I would be very thankful to all entomologists or observers of nature who 

 would communicate me their observations. 



R. OSTEN SACKEN. 



Washington, D. C. 

 Russian Legation, 

 August 25, 1861. 



