104 



THE AMERICAN ENTOMOLOGIST. 



The Bastard Oak-apple' (Q. inanis, Osten 

 Sacken, Fig. 79), matures like tlie preceding; in 

 June, but is found exclusively upon the Rod 

 Oak(qt(ercn)i riilji-a). It differs from the pre- 

 ceding in never reaching so larjiO a size, in the 

 central cell not being •\voody, but consisting of 

 a mere shell which can be readily l)rokon with 

 the thumb-nail, and in its being only connected 

 with the external rind by slender radiating- (ila- 

 nicnts. Males and females {Cynipsij. itmnis. 

 (). S.) absolutely undistinguishable from the 



(.oloi— Drill) 

 spring form of the preceding arc adaiuablc from 

 this gall in .June: but after repeated trials we 

 have never succeeded in breeding from it a single 

 autumnal female, and wc do not believe that 

 any such form exists in this species. Hence, 

 and also in consequence of the very great dis- 

 similarity of the galls, and their always grow- 

 ing upon distinct species of oak, we are com- 

 pelled to consider these two gall-flies as distinct 

 species, although when placed side by side the 

 forms generated in the spring ari' exact h like 

 each other. 

 TiiK Oak-i-i.i.m (iALL* (Fig. SO «) is rciuark- 



It-iK SO] 



•First described liy the sonior Editor under tli.. nimi.^ 

 luercm piunui in Proc. F.nt. Sor. Phil. Ill p. tiSli, ii..l( . | ' 



able for beisig the only American gall that is 

 known to grow out of the acorn. It occurs in- 

 discriminately upon Black and Red Oak. reach- 

 ing maturity in August and September. At 

 that period it is solid but fleshy, and when cut 

 into is of a pink color inside ^hading into yellow 

 towards the middle. '^nl)se(|uently, as it dries, 

 it becomes ^o Innl ,is to In- i ut witli difhcultv, 



its color inside changing, first to blood-red and 

 afterwards to brown. The insect that produces 

 this gall {Ci/nips q. prunux. uew species. Fig. 

 81), makes its appearance in April, and is 

 remarkable for lying two _\cars in the gall 

 before it eats its way out. remaining in the larva 

 state for over a year ; indeed some of them re- 

 main in the larva state for over two years, and 

 do not eat their way out until the end of the 

 third year.* Figure Hu. h, shows this same gall 

 when cut open, and figure 8tt, c, the central cell 

 inhabited bv the larva. 



iiivit and in luige iium- 

 . Ill Deit-niber, l*>i, 



si;.-,, thr ilv^nct «-:ls .•^till 



-hiiwing tliat tlu'l: 

 iLlescriptioiiofth 

 species is new to s 



CV.MPS Q. PKLN 

 iO-pU 



IS lor 

 joints 



2 niack. Head rather coarsel3- 

 ,cent; antennie rather more than 

 iointeil, joint 1.1 equiil in lenffth 



ns..|y 



r"in ^ilv^'r Th'- w liolt- of joints 3-7 sculptured like 

 (•'^ ti-rnun;il om-lourth of ioint 2. Legs rufous, the 

 \;i- irochantfis and tarsal tips black, jrings subhyalinc, 

 irli a dark brow n cloiid exttndinc from the first transverse 

 in over the areoiel and the radial area to the tip of the 

 iiiit Veins all brown and distinct, but neither the subcos- 

 1, radial, cubital, nor anal veins attaining the exterior 

 argin. Length $ 0.2lt—0.30inch. Expanse!). 47— 0.85 inch. 



Dci-ribed from 11 $ specimens; f^ unknown. Differs 

 jni all described N. A. species by the beautifully opaque 

 initnation, eiitirelv unaccomp.anied by any inibesceHce, 

 Ihetiporthea' ' ■ 



