1863.] 
325 
Following Willdenow, I have considered this oak a distinct species, 
and not a variety of Q. prinos. 
The gall is probably identical with a species described by Baron 
Osten Sacken as found on Q. prinos. His description is as follows : 
Swelling of the leaf stalk at the basis of the leaf, or, sometimes, of 
the midrib near the basis.” When on the petiole “ subconical or club 
shaped; rounded when they occur on the midrib.” (Proc. Ent. Soc. 
Philad. i, p. 66.) 
His specimens produced only parasites, and as mine have produced, 
besides many parasites, a few true gall flies, I will describe them under 
the specific name he has given to the parasite reared from the same 
gall. 
Cynips q. petiolicola n. sp. 
9 . Vertex of tlie head black, nearly smooth ; face brown ; pubescent ; organs 
of the mouth light brown : antennae reddish brown, 13-jointed ; teioninal joints 
darker color than the basal. Thorax minutely rugose : two longitudinal grooves 
converging towards the scutellum ; within these, two shorter grooves reaching 
half-way from the collare to the scutellum; also an indistinct groove over the 
base of the wings. Scutellum with a few scattered hairs, wrinkled ; basal pits 
large and deep. Legs light brown, posterior pair dark brown ; tips of tarsi very 
dark brown or black. Abdomen black, polished; ventral portion dark reddish 
brown ; second segment half the length of the abdomen. Wings hyaline ; veins 
distinct but slender : areolet very small; radial area not closed; cubitus disap¬ 
pearing before reaching the 1st transverse. Length 0.10. 
Antennse 15-jointed; third joint incised; abdomen black ; 1st segment 
long : 2d segment three-fourths as long as the remaining ones : otherwise as the 
female. Length 0.08. 
G-all from Querous Chinquapin. 
Compared with the last species I can discover no difference in the 
gall, and little in the insect. The head of the female is a clear brown, 
verging towards black, and in the antennae of some specimens there 
are indications of a 14th joint. The wings are somewhat less distinctly 
veined. I think it a variety of the last, though a more close examina¬ 
tion may show specific characteristics. 
I have galls from the petioles of the leaves of the white oak very 
much like those last described. The insects are not, I think, specifi¬ 
cally distinct, though the veins of the wings are less distinct than either 
of the above; some of them are entirely colorless, and the inner angle 
of the areolet is scarcely discernible. 
