1M)-J.] 25n 



I have iio doubt, on accKUiit (if their structure, that they are the produce 

 of a C//)ii/>s. 



QUERCUS OBTUSILOBA. J^ost Oak. CInxters of swdfl, xomfiwhat Ixll- 

 shaped, j)eti()late, (jreenish galh oti flrr iiikIit i<l<h- of flir feovfs, along fh.<' 

 midrib. 



Their shape may be compared to that of the flowers of Vacciniuni. They 

 are attenuated at the basis into a short petiole, fastened to the midrib of 

 the leaf; the opposite end is truncated, the truncature being excavated ; 

 the length, from the foot of the petiole to the truncated end, is from 0.12 

 to 0.15. They grow in numbers, sometimes of ten or more together, so 

 that six, for instance, form a row on one side of the midrib and four or 

 five on the opposite side. When found by me on the tree in October, 1861, 

 these galls were pale green; the dry specimens are brownish. Inside of 

 each was a small whitish larva, probably of a Ci/nips. 



QuERCUS ALBA. Wliifr Oak. Clusters of small, Touiid, reddish (j<dh 

 un the petioles of the irhi'te o^//- leaves ; iitsldr compefet^ with a hard ker- 

 nel. Diameter about 0.15. 



Found quite abundantly in October, 1861. I did not describe them at 

 once and the specimens now before me are brown and shrunken. The 

 kernels of those which I opened at that time seemed empty. Still, I be- 

 lieve that the galls belong to Ci/nips. as I found in the box, containing 

 them, a parasitical Cynipideous insect, appai'ently escaped from them. 



QuERCUS ALBA. White Oak? Large, round ijall of a hard eorki/ sidj- 

 stanee, growing on the hranehes ; a round, hollou- space in the centre. 

 Diameter 0.75-0.95. Cynips quercus juglans n. sp. (as yet unknown). 



I found a couple of these galls in winter, on the ground, under an oak, 

 the species of which I was unable to ascertain. Afterwards, Mr. Hitz, of 

 the Maryland Agricultural College, communicated to me a number of these 

 galls, with the statement that they grow on the branches of the white oak. 

 All these galls, as well as those found by myself, were somewhat shrunken 

 and wrinkled on the surface, probably fi'om the effects of dryness. They 

 are easily distinguished from the galls of (\ q. globulus Fitch by their 

 large size and their much harder substance. It requires some effort to cut 

 them open, whereas, the dry galls of 0. q. globulus can be easily cracked. 

 For the same reason the kernel of the latter gall can be more easily detach- 

 ed from the surrounding corky substance, than that of the other gall. 

 The greater ]iart of the galls which T cut open contained a cluster of small 



