254 [Septembkr 



chestnut oak, with the important difference, however, that they occur on 

 the upper side of the leaf, whei'eas, the others are found on the under side. 

 This makes me uncertain, whether they are the produce of Cijnips or of 

 Cecldomyia. I had no opportunity of observing fresh specimens, as those 

 in my possession wei'e communicated to me by Dr. Foreman, who had 

 found them in Maryland. I did not find anything in the hard kernel of 

 those which I cut open. 



QuERCUS PRINOS, var. BICOLOR. Lavffe gall^ at the tip of twigs, con- 

 sisting of a numhf'r of wedge-shaped bodies, fastened hj/ tlieir pointed 

 ends to a common centre. Diameter about an inch and a half. C. Q. 

 STOBILANA n. sp. (as yet not reared). 



This gall, one of the most remarkable in my collection, was kindly com- 

 municated lo me by Dr. Samuel Lewis, in Philadelphia, as found on young 

 branches of this oak, in Hoope's tlarden, near West Chester, Penn. For 

 another specimen I am indebted to Dr. Morris, in Baltimore. These 

 specimens measure rather more than an inch and a half in diameter and 

 look somewhat like the cones of some kinds of pine, for instance, of the 

 scrub-pine, as they consist of a number from 20 to 25 or more of wedge- 

 shaped bodies, closely packed together, with their pointed ends attached 

 to a common centre. These wedges are hard and corky and break off 

 very easily when the gall is dry. Each of them contains a hollow kernel 

 with a plump, large larva inside. This gall is evidently produced by the 

 sting of the insect on the single leaves of a Inid, each leaf growing into 

 the shape of a wedge. I did not succeed in rearing the larvae, which 

 were still living when I received the gall. [ call the Ci/nlps by antici- 

 pation C q. strohihiaa. 



QuERCUS PRINOS. tSircmp-chestinif OnL-. Glohidar galls on the' un- 

 der side fjf the leaf, alrmg the prineijial rihs. Diameter upwards to ^).'i. 

 Gall-fly unknown. 



They were communicated to me by Dr. Foreman, who found them in 

 Maryland. Not having seen any fresh specimen, I-can only describe the 

 dry and somewhat shrivelled ones. Their surface is finely downy, which 

 gives them a peculiar brownish-creani-colored shade. They contain a ker- 

 nel in the middle, nearer to their bases, from which numerous woody fibres 

 radiate toward the stout woody shell. They occur in numbers on the same 

 leaf, a moderate sized leaf which is in my possession, bearing eight of 

 them, the largest of which has 0.8. the smallest hardly <».l in diametei'. 



