114 Corydalis formosa and Corydalis canadensis. 
for the present season, barren. An Isabella that bore three hundred 
bunches the last year, is now destitute of fruit.” 
I had recollected that in the preceding season (1830) the vine ines 
were infested by a ‘‘small chesnut colored smooth worm ;” and in 
that year (1831) it again appeared on the leaves of my vines; and 
also on those which had been visited by the bug, in other places. I 
suspected that these were the larve of the C. vitivora, and we de- 
stroyed all that we could find. By pursuing this course, in the spring 
of 1832 and 1833, only a few bugs have been detected. 
In order to settle the question, which had arisen, whether these 
worms were the larve of the C. vitivora, or not—in the summer of 
1832 we put half a dozen of them into a tumbler, with moist earth, 
and vine leaves, covering it closely. ‘The earth was first carefully 
examined to see that it harbored no other insect. Fresh leaves were 
supplied, from time to time; and as the worms became full grown, 
they passed, one by one, into the earth. After a fortnight or so, (for 
the time could have been exactly determined only by appropriating 
a glass to each worm), we found in the tumbler three perfect insects 
of C. vitivora, 
This experiment, although not so complete as it might have been, 
seems to leave but little room to doubt the indentity of the supposed 
larva with this troublesome insect. 
For the information of those who cultivate the vine, that they 
might be put on their guard against so dangerous an enemy,—most 
of the foregoing details were published from time to time, in different 
horticultural journals; and I have now collected and arranged them 
for the American Journal of Science, in order to inquire if this insect 
has appeared in more distant parts of the United States, and wheth- 
er or not, it had been previously described and published? 
2. Remarks on the specific character of Corydalis gee and Co- 
rydalis canadensis. 
Professor Eaton, in the last edition of his Manual of Botany, con- 
siders C. canadensis as ‘‘a division” of C. formosa, ‘founded on 
some slight difference produced by cultivation.” I believe this opin- 
ion has also been adopted by some other botanists; and I therefore 
enclose drawings made from each plant while in a living state. I 
may add, that I have been acquainted with both for several years, 
having cultivated them in my garden, although the former is indigen- 
