80 
growing in shade were nearly free from wasp attack. The wasps 
would hover about a plant and then alight and walk about it, but, find- 
ing nothing, would continue to the next plant, and so on to another. 
The following year, in the latter days of August, the writer observed 
this wasp attacking the larva of Pieris rapas, leisurely chewing it 
before living away to provision its nest. 
It is evident that this habit of wasps has been observed before. The 
following was published in Dr. Lintner's third report as State Ento- 
mologist of New York, for 1886 (1887, page 135): "Mr. C, R. Moore, 
of Johnson Town, Va., states that he has seen the common brown wasp 
(? Polistes fuscatus) seize the green worms on cabbage (? .Pieris r apse), 
sting them repeatedly, and then cany them awa} T ." 
The Cabbage Root Maggot injurious to celery. — Mr. James Granger, 
Broadalbin, N. Y., mentioned in preceding pages as having reported 
injury to celery by the carrot rust tly (Psila rosse Fab.), sent, under 
date of November 19, 1901, a larger larva than that of the rust fly, 
stating that it occurred in the heart of celery, and that he believed it 
to be causing " rot. r He was aware that the same species, or a similar 
one, infested radish in the same field, and there is little doubt that 
this insect spread from the radish to the celery. The cabbage root 
maggot, as its name implies, attacks cabbage, including all its varieties, 
as well as most other forms of cruciferous plants. As Mr. Granger 
has shown himself a good observer by his correspondence, there can 
be no doubt of his statement that these larvae occurred in celery. He 
distinguished the two species, and sent the cabbage maggots in about 
equal numbers with the rust fly maggots. Celery appears to be a new 
food plant for the cabbage root maggot. The early rearings were 
without doubt unnatural, caused by the overheating of the rooms in 
which the rearing jars were kept. 
While there is no doubt that this cabbage maggot is quite closely 
restricted to cruciferous plants for food, it will occasionally, in case 
of emergency, attack plants of other botanical orders. Miss Ormerod 
has quoted Mr. Meade as saying that maggots were reared in 1882 
from " earth round partly decayed clover roots," while Lintner has 
stated on one occasion that the larvae had been detected mining the 
leaves of beet (Bui. 78, C. U. Agr. Expt, Sta., 1894, p. 513). 
OBSERVATIONS ON INSECTS AFFECTING LATE CABBAGE AND 
SIMILAR CROPS. 
Some attention has been given by the writer in recent years to the 
study of some of our common insect enemies of cruciferous crops, 
with a view to ascertaining more in regard to them, and the notes 
which follow were made to determine just how far careless methods 
of culture are to blame for injury by these insects. Brief mention 
has been made in Bulletin 22 (n. s., pp. 55-61) and in Bulletin 30 (n. s.. 
