78 
This species seems to be but single brooded, as no young larve were 
to be found after the first of June. As, however, the spinach beds 
were rooted out before midsummer in all the gardens of the vicinity, I 
can not be quite certain upon this point, but could not discover it on 
beets or any of the native Chenopodiacee. The insect is one to which 
it is difficult to apply insecticides, as the leaves which it attacks lie 
close to the earth and it is, as a rule, on the under side. 
NEw Rose SLuG. 
(Cladius isomera Harris.) 
Early in August a friend, residing at St. Charles, Mo., sent me speci- 
mens of a Tenthredinid larva that was working on her rose bushes, es- 
pecially on climbers. This species, new to me, devours the entire sub- 
stance of the leaves, guawing into them large ragged holes and webbing 
them together in the formation of its cocoons, greatly injuriny and dis- 
figuring the plants. It is characterized as follows: 
Mature larva 12" in length, 3™™ in diameter across thorax, from 
whence it tapers very shghtly backward; form cylindrical. Color, pale 
bluish-green, surface clothed with tufts of soft gray hairs. Head 
opaque, dull whitish green, under the lens densely mottled with pale, 
ferruginous, small black dot, above which is a rectangular ferruginous 
Spot on each side. Twenty legs, concolorous with general surface. 
Spins up between folded leaf or betweeu two leaves, in glassy, gummy, 
pale brown cocoon, 7" long, of an oblong shape, flattened on both 
sides against the inclosing leaves and with many gummy threads 
spreading in every direction. 
Cocoons were formed in rearing cage August 20. Flies appeared 
August 29. On the 2d of September I detected two in the act of ovi- 
positing, with their well-developed “saws” deeply buried, one in the 
midrib, the other in the petiole of a fresh leaf. Two or three minutes 
’ were occupied in the placing of an egg and each fly put in three or four 
without pausing to rest. By carefully detaching the surrounding fibers 
the egg was revealed. It is oblong, scarcely 1™™ in length, and almost 
transparent. These eggs failed to hatch, probably for lack of fecun- 
dation. 
From what I have learned from my friend, and infer from the habits of 
the insect in the rearing cage, there are an indefinite number of broods 
during the summer, and where it has become established it is therefore 
a more serious pest of the “queen of flowers” than even Selandria 
rose. Ido not doubt, however, that by killing off the earliest broods 
with drenchings of an infusion of white hellebore, it could be kept 
in check and by perseverance in the treatment eventually extermi- 
nated. I have not been informed of its occurrence in any other part of 
the State, 
ae ane 
