396 HENRY SIiniER, M. D. 



becomes rough and corrugated. Tlie trees seldom attain more than a fwt in 

 diameter. Winter bud small, slender, not smooth, yellowish. AbundaVt in 

 the prairie groves and copses on the low bank of water courses. 



There appears to be two varieties of the C. ainara. In the usually described 

 variety, the leaf is immaculate, and to this the gall No. 6 is entirely confined. 

 In the other, the leaf is sprinkled with small, grey, glandular dots beneath, 

 which remain persistent during the summer, and to this the galls No. 7 and 8 

 are exclusively confined. 



The peculiar choice of these insects, would lead us to believe that the tree 

 with the dotted leaf may be a new and distinct variety; but I have not yet 

 made a sufficient examination of the fruit to decide this point. Nuts found on 

 the trees bearing gall No. 7, do not materially differ however from those of the 

 tree bearing gall No. 6. 



I have never yet found the fruit of a tree bearing gall No. 8, but judging from 

 the leaf, bud and bush, I know it to be identical with the trees bearing gall 

 No. 7. Neither did I find galls Nos. 7 and 8 on one and the same tree. The 

 locality of gall No. 7 was a mile from that of gall No. 8. The trees are in all 

 respects similar, both having the small dots under theleaf, and very probably 

 the galls will be found together. 



This tree, with the thick sprinkling of small grey dust-like glands beneath 

 the leaf, may be designated as Carya am'ira-glandala, by way of distinction, at 

 least to answer the jjurpjses of entomological research. 



I spent the 4th of November 18(58, at Rock Island — a portion of the morning 

 on the Island, and the afternoon among the blufFs to the eastward of the city — 

 examining the hickory trees and their fruit. I found, C. alba, C. aiiiara, and 

 a solitary tree of C. tomcntofia, I did not see a single tree of C. glabra. 



To render my determination of C awara more certain, I carried with me to 

 Columbia College, New York City, a number of the nuts for comparison with 

 the specimens in the collections there; and through the kind assistance of.Dr. 

 Torrey, Professor of Botany at the college, and Mr. LeRoy of PeekskiU, it be- 

 comes entirely positive that the nuts gathered, both in the vicinity of Rock 

 Island and of Mt. Carroll, are those of C. amara ; and that there are no fruit 

 bearing trees, and therefore probably none of the C glabra, in either of those 

 localities. 



Mt. Carroll, Ills., April, 1863. 



NOTE. 



During the summer of 1863 I made the fjllowing observations on 

 Hickory Galls in the vicinity of Mt. Carroll : 



June ISth. — Gall No. 6 already had winged imagos and eggs, the lat- 

 ter were not found last year. They were translucent-whitish, abund- 

 ant, length .005 inch. The first gall observed contained two mother 

 insects. 



June 20th. — Gall No. 9 was far more abundant than last year and 



