38 PARASITES OF THE COTTON BOLL WEEVIL. 
individual for each host. The developmental period seems to be 
considerably shorter than in either of the species preceding. The 
data upon which the following figures are based cover the period 
from June 25 to October 28. During June and July the total develop- 
mental period is known to be over 11 or 12 days, during August it is 
over 14 days, and during September and October over 18 days. 
The pupal period in June and July is only 4 to 6 days, in August 6 
to 7 days, in September 5 to 9 days, but in October 13 to 15 days. 
The larve of Catolaccus were described in the notes as having 
short hairs in a row on each segment. The pup are white to yellow, 
the thorax turning black first as they approach maturity. The 
abdomen is very flat below and bent at an obtuse angle to the thorax. 
The head is very broad, and the eyes are pink. The exuvium is 
yellowish and resembles a little pointed cap. (See figure of pupa, 
Plea pie .2- 
6. Sigalphus curculionis Fitch. No corroboration has been recorded 
of the parasitism of the boll weevil by this species. This parasite 
is very commonly bred from the plum curculio (Conotrachelus nenu- 
phar Hbst.). Chittenden also records it as a primary parasite of 
Trichobaris trinotata Say, which breeds in the stems of Solanum 
rostratum (Chittenden, 1902). 
7. Urosigalphus anthonomi. Cwfd. This parasite was again bred 
September 20 from material collected September 5 at Brownsville. 
The period in the cocoon was at least 9 days. The cocoon with 
weevil larva’s head attached was half in a cotton seed in a boll. It 
was very much finer meshed than that of Bracon mellitor and easily 
broken. In addition to this species and (8) Urosigalphus schwarzi 
Cwfd., both bred from Anthonomus grandis, Urosigalphus armatus 
Ashm. has been bred from Balaninus, and another species ( Urosigalphus 
bruchi Cwfd.) from Bruchus prosopis Lec. taken at Harlingen, Tex., 
in beans of Prosopis glandulosa. Hence it is very probable that the 
species of this genus are normally weevil parasites. 
9,10. Bracon mellitor Say. Bracon dorsator Say. Bracon vantho- 
stigma Cress. 
These are all forms of a single very variable species, of which the 
entirely red form holds the name B. mellitor, that with black sternum 
and metathorax the name B. xanthostigma, and that with the thorax 
almost entirely black and the vertex of the head also black, being 
also smaller in size, has been known as B. dorsator. 
A peculiar record is furnished by F. H. Chittenden who reared this 
species from the strawberry leaf-roller Ancylis (Phoxopteris) comp- 
tana Frol., from material collected at Cabin John, Md., July 9, 1899. 
In a personal letter dated August 30, 1906, Dr. Wm. H. Ash- 
mead writes: ‘‘ Bracon mellitor Say is avon ic a most important 
parasite, widely distributed in the United States, and must affect 
