58 
the imported worm, it makes its first appearance some time in April 
in the vicinit} T of the District of Columbia. 
The eggs hatch in six days in hot July weather, a longer time being 
required in a cooler atmosphere. The stage passed in the cocoon in 
warm weather has been observed to be ten days. Part of this time 
the larvae were probably quiescent. The exact pupal stage was not 
observed, but probably varies from six days to considerably longer, 
according to temperature. The period of the larva varies from two 
to three weeks, and perhaps longer in cool weather. 
NATURAL ENEMIES. 
The cross-striped cabbage worm is subject to the attack of small 
four-winged parasites of the genus Apanteles, and a few other natural 
enemies, including wasps, destroy it. 
Apanteles congregatus Say is recorded as having bred from material 
received in 1880 from Mississippi (Report Com. Agr., 1883, p. 127). 
A. utilis French was reared from material received from Lone Star, 
Miss., October 17, 1879 (Insect Life, Vol. Ill, p. 16). 
A. xylina Sa} r was reared from cocoons on and with its host by Dr. 
A. D. Hopkins, Morgantown, W. Va., July 26. Of this latter occur- 
rence, Dr. Hopkins (1. c, Vol. IV, p. 259) remarked: "This species 
was found p^ntifully wherever the host was observed. Gardeners 
generally were destroying the cocoons, supposing they were the eggs 
of the caterpillars." 
A. Iseviceps Ashm. issued September 30 from larvae obtained in 1899 
from Athens, Ga. 
A. alamedensis Ashm. was reared Jul} T 16, 1900, from larvae obtained 
from Montreal, Ga., and sent to this office by Mr. J. H. Heard. Fully 
half of the larvae (a large number) were parasitized. 
Meteorus indagator Riley MS., issued from material received from 
Oxford, Miss., September 1880 (1. c, Vol. Ill, p. 59). 
REMEDIES. 
In treating this species it should be borne in mind that "worms" of 
other species as well as other cabbage pests are more often present than 
otherwise. 
Arseniccds. — The best remed} T is Paris green applied either dry or 
wet, preferabl}^ however, as a spray, at the rate of about one pound 
of the poison to 150 gallons or a little less of water, and it should be 
used when the plants are first set out, to insure its reaching the young 
larvae or caterpillars before the} r have burrowed far into the heads; 
in other words, this poison should be applied in the same manner as 
for the imported cabbage worm, as the two species have much the same 
habits. Other applications should follow frequently, as required, and 
can be made with safety until the heads are about half formed, and 
