1864.] 
447 
left on a particular tree, three or four which I opened contained each a 
lively cynipidous larva in the central nucleus, and full one-half of the 
whole number were not perforated. 
On September 6th I opened two of the oak-apples gathered early in 
June, and found a black ^ pupa, apparently aciculata, in each. On 
Sept. 17th and 18th I found in the same lot of oak-apples 7 9 aciculata 
in the imago state, and during the month of October and the early part 
of November I bred very numerous imagos of the same, say from 50 
to 60, all $ . On October 25th I obtained three specimens from galls 
with a thinnish shell, and one from a gall with a shell as thin as paper 
and a distinct nipple at the tip. Of three others bred the same day 
from thick-shelled galls, one came from a gall with a terminal nipple, 
and the other two from spherical galls. On October 27, out of 11 or 
12 9 aciculata that came out, several came from galls with a terminal 
nipple and from galls covered with nipples all over, the rest from sphe¬ 
rical galls. Other specimens continued to come out till November 16, 
and a single one after that date. Not a single parasite had made its 
appearance since July 23rd. On January 20, 1864, I cut into 30 or 
40 of the remaining galls and found in them 9 aciculata 9 fresh and 
limber but dead, and 2 specimens dead and dried up, besides some 
dead and dried up parasites. 
Besides the locality above referred to, I reared in 1862 a % spongifica 
and several 9 aciculata from a different locality, the gall of the former 
gathered in the spring and that of the latter in the autumn and both 
found on q. tinctoria. 
From the above facts I draw the following conclusions — 
1st. Ognips q. spongijica 0. S. is identical with G. q. coccinese, O. S,, as 
there are confessedly no distinctive specific characters of any impor¬ 
tance, and the galls occur on the same species of oak (q. tinctoria) and 
are connected by all the intermediate grades. The spongy matter of 
the gall of q. coccinese is said to be “whiter” than that of q. spongijica^ 
but I noticed several galls of aciculata^ the spongy matter of which 
was in January, 1864, almost pure white. 
2nd. G. q. spongijica 0. S. occurs % 9 exclusively on q. tinctoria, 
and emerges not later than June from galls that commenced their 
growth in the preceding month of May. 
3rd. G. q. aciculata 0. S. is a dimorphous form of G. q. spongijica 
