tlu! i^all is tho prolong-ation of a vein; in the latter case, the vein, in con- 

 sequence of the growth of the leaf, has become entirely independent of the 

 blade and appears to be growing out of the leaf-stalk. (I am indebted for 

 this explanation of the growth of this gall to Prof SchacflFer, of this city). 

 The inside of these calls is hollow; each contains a brownish, oblonL' 

 nucleus, kept in position by woody fibres. On the 17th of June I obtain- 

 ed the gall-fly from one of my specimens; on June 28th a parasite from 

 the other; the third was dry when T found it. The gall-fly is a S and T am 

 inclined to take it for the male of either C. ronjiiicns Harris or of an allied 

 species. (Compare the Introduction.) 



Cynips quercus coelebs n. sp. — Head and thorax black, opaque, deeply rugose, 

 the latter pubescent : antennse reddish-brown, paler towards the tip, 15-jointed, as 

 long or longer than the body; feet ferruginous-yellow, posterior femora and tibiae 

 infuscated; wings with a brown spot on the second transverse veinlet and a pale. 

 almost obsolete brownish shade between it and the anal angle of the wing; the sub- 

 costal and radial veins are interrupted before reaching the anterior margin: the 

 areolet is small, indistinct; the second transverse vein is stout]' and angular. 



Length 0.16. 



8. Quercus alba. White oak. Elongated^ fmifonn gall on a pcdUiit. 

 mostly on the margin^ sometimes on the surface of the leaf. Cynips QUER- 

 CUS PUSIFORMIS n. sp. 



Resembles the preceding, but is much smaller. The pedicel is 0.2 or 



0.8 long, the fusiform body about 0.15 or 0.2 and ends in a point. The 



pedicel is a prolongation of one of the leaf-veins. The color of the gall is 



that of the leaf, that is, it is green as long as the leaf is green and fades 



with it. This gall was first communicated to me by Mr. T. Grlover, at the 



Maryland Agricultural College. He had obtained a parasitical Hymen- 



opteron from it. In May 18(U I found several specimens of the same gall 



on a young white oak and succeeded in rearing the gall-fly. 



Cynips quercus fusiformis n. sp. — Black: antennaj brownish-yellow, infuscated 

 towards the tip, llj-jointed, third and fourtli joints of about equal length, elongated ; 

 the following joints gradually decreasing in length; four joints before the last are 

 of equal length; last joint more than twice as long as the antepenultimate; face 

 pubescent below the antennae, smooth and shining above; thorax moderately shin- 

 ing very finely punctate, somewhat pubescent on the shoulders ; two furrows 

 converging towards the scutellum; the beginning of three others, indistinct ones, 

 between them; scutellum more opaque than the thorax, gibbous, with a hardly 

 perceptible, microscopical rugosity; abdomen chestnut-brown, a reddish band near 

 the posterior margin of the second segment; the latter more than three times as 

 long as the third segment; feet yellowish-ferruginous; posterior tibiae slightly in- 

 fuscated ; wings hyaline ; thick veins brown ; areolet moderate, triangular, very 

 distinct; cubital vein somewhat indistinct at its origin, second transverse veinlet 

 somewhat oblique, arcuated. Single female. Length 0.09. 



9. Quercus OBTUSILOBA. Post Onh. Stnall. romul. imhcsnnt. irmt- 



