18G1.] 



G3 



Shell green, succulent, hollow on the inside, containing a whitish, glob- 

 ular body, about 0.1 in diameter, which rolls freely about, not being fas- 

 tened to the shell. 



I found these galls quite commonly very early in the spring, on the 

 buds of the oak, before any leaA'es had appeared. At that early season al- 

 ready, the globular, whitish body contained the pupa. When the leaves 

 came out, I observed the same gall on them, generally close by the leaf- 

 stalk. The fly was obtained from the galls brought home on the 17th of 

 May. In the woods, most of the galls w^ere found empty on the 25th of 

 May. Still, some of them contained the fly yet. 



Several galls of this kind were observed on the pin oak; they seem to 

 occur also on other oaks, but I neglected to observe on which, chiefly on 

 account of their appearing before the leaves were developed. The gall 

 shrinks completely when dried, but can be well preserved in spirits. 



CynipsCTrigonaspisDquercus palustris n. sp. — Black, mouth brownish-yellow, 

 palpi brownish: antenna iililorni, Ij-jointed in both sexes, 4 to 6 basal joints yel- 

 low, the remainder brown (in the % the basal joints are also somewhat infuscated) ; 

 third joint longer than the others, the following four gradually decreasing in length, 

 the remainder of the same length ; in the % this difference in length is not so strik- 

 ing as in they, and the third joint is somewhat thickened, whereas it is almost 

 linear in the 9; thorax black, smooth, shining; scutellum smooth and shining su- 

 periorly, deeply sculptured on its posterior declivity ; abdomen black, shining ; 

 feet yellow, basis of coxae brown, tips of tarsi black; wings immaculate, thick veins 

 brown, those of the anterior portion of the wing especially dark; the basal vein 

 sometimes obsoletely clouded; areolet of moderate size, distinct; cubitus distinct 

 on its whole length, not quite reaching the margin. 'J, and 9 • Length 0.08 — 0.1. 



12. QuERCUS RUBRA. Red Oak. ^^Glohular (jalh, of the size of a haz- 

 elnut or grape., groioing through the leafij exjiansion of the red oak, a 

 third of the sphere projecting from the iqijjer surface of the leaf and the 

 remainder opposite, on its under side. " (Dr. Fitch, Reports, Vol. II, No. 

 818). Cynips nubilipennis Harris (Callaspidia nubilipennis Fitch.) 



The gall-fly is " black, with tawny yellow legs and its wings smoky on 

 their disk and tips, with none of the veins continued into the margin, the 

 antennae 13-jointed in the female, which is 0.20 long and to the tips of 

 her wings 0.30." (Fitch, 1. c. See also Harris, Treatise etc. p. 434.) 



This gall never occurred to me in the environs of Washington. 



13. QuERCUS ALBA. White Oak. Small, rounded galls, projecting on 

 both sides of the leaf Diam. 0.25 — 0.3. Cynips quercus futilis n. sp. 



Pale green, rounded but not globular, being somewhat flattened; inside 

 with two or three small, seed-like, oblong kernels, kept in position by some 

 whitish filaments. In July some of these galls are found dry; they retain 

 then their size and shape, but have the color of a dead leaf the rest of 



