62 [October 



like excrescences on the nnderskle of the leaves. Diameter about U.08. 



Cynips quercus verrucarum n. sp. 



They occur in numbers on one leaf in the latter part of the svimmer ; 

 when the leaf is dead, the wooly pubescence of these excrescences is pale 

 ferruginovis, but earlier in the season, it is I suppose, snow-white, as are 

 similar excrescences on other oaks. I obtained several specimens of a gall- 

 fly, which I call: 



Cynips quercus verrucarum n. sjj. — Black, shining, mouth reddish, antennae 13- 

 jointed, somewhat incrassated towards the tip, brownish, sometimes brownish- 

 black, pale towards the base, especially at the tip of the two first and at the third 

 segment; thorax shining, smooth, not punctate, even the usual grooves not per- 

 ceptilbe ; feet yellow, base of coxse, middle of femora and tibiie brown; v/ings hya- 

 line, thick 'veins brown, second transverse vein curved, almost angular; areolet 

 rather large, distinct; cubital vein slender, almost obsolete at the basis; feet yel- 

 low, coxce, excejDt at tip, femora and tibife in the middle, brown or almost black; 

 (the feet of some specimens might be described thus: brownish-black, with more 

 or less yellow at the articulations; tarsi yellow). Length 0.05. 



Four specimens 9 (?). I am not positive about the sex of my specimens, 

 on account of the shrunken state of their abdomen; the number of joints 

 of the antennae I saw distinctly only in one specimen. 



Similar excrescences, but somewhat larger, occur on the white oak and 

 the swamp chestnut oak ; in June and July both were covered with a 

 white pubescence. On the former tree they occured in rows, on the un- 

 derside of the leaf, along the principal veins. On the chestnut oak I 

 found them singly. Both are probably the produce of Ci/mjis. 



lU. Quercus alba. White Oak. '' Round mass, resembling wool, 

 the size of a hazelnut or icalmit and of a uhite or Iniff color, grow imj upon 

 one of the jyrincipcd veins on the underside of the leaf. Internalli/, numer- 

 ous hard seeds about the size of grains of wheat, crowded together and at- 

 tached b]j their lower end to the vein of the b-af. " (Dr. Fitch's Reports. 

 Vol. II, No. ol6). Cynips quercus lanje Fitch. 



I have not found this gall yet and mention it on account of its resem- 

 blance with the following: 



Quercus obtusiloba. Post Oak. Very like the preceding, but ap- 

 parently smaller and of a more irregular form. Those I observed grew at 

 the basis of the leaf, extending about an inch or less along the midrib 

 and sometimes invading the upper side of the leaf. They also contained 

 seed-like kernels, but much smaller than a arain of wheat. I found them 

 in autumn and did not obtain the fly. 



11. Quercus PALUSTRIS. Pin Oak. Globular, hollow galls on the 

 buds and young leaves. Diameter 0.35 — 0.4. Cynips QUERCUS PALUS- 

 TJIIS u. sp. 



