BIOLOGIES OF WEEVILS CONTRIBUTING PARASITES. 45 
the conclusions in this regard may be more thoroughly understood, 
this subject must be introduced by a series of brief biologies of all + 
the weevil species which have contributed parasites to the attack of» 
the boll weevil. 
CURCULIONID#A. APIONINZE. 
1. Apion decoloratum Sm. breeds in Meibomia paniculata. It is 
parasitized at Washington, D. C., by Catolaccus incertus. 
2. Apion griseum Sm. breeds in Phaseolus perennis, and is para- 
sitized by the same species as the preceding. 
CURCULIONIN. CLEONINI. 
3. Lixus musculus Say makes a gall in the stems of Polygonum 
pennsylvanicum. The larve and pupe are found in these galls. The 
weevil and its host plant are typical of tne fall, the plant being 
found in low moist ground, frequently in close proximity to cotton 
fields. The weevil is attacked by two of the important boll-weevil 
parasites. . 
4. Iixus scrohicollis Say dwells in the stems of Ambrosia trifida. 
and psilostachya, two of the commonest roadside and waste-place 
weeds throughout the country in summer and fall. The entire stem 
is riddled by the weevil larvee, which pupate in cells of frass at the 
end of their burrows. Eurytoma tylodermatis and other parasites not 
concerned in the discussion have been bred from this weevil. 
ERIRHININI. 
5. Desmoris scapalis Lec. breeds in the seed heads of Sideranthus 
rubiginosus, a summer weed, which is very abundant in some localities 
along roadsides and on prairies. The larve are expelled with the 
seed and enter the ground for pupation, maturing in the following 
spring. This species is parasitized by Bracon mellitor, which has a 
much more rapid development than itshost. (See Pl. III, B, D, F,G.) 
ANTHONOMINI. 
6. Anthonomus (Anthonomorphus) fulvus Lec. breeds in the buds 
of Callirrhoe vnvolucrata, an early spring mallow, which is common 
in May and June on moist meadows. The larve feed upon the floral 
column of the bud or the imperfectly opened flower and pupate in a 
cell of excreta in the capsule or fallen corolla. Bracon mellitor and 
Catolaccus incertus have been bred from it. (See Pl. II.) 
7. Anthonomus signatus Say, the strawberry weevil, breeds in a 
number of rosaceous plants, such as strawberry, blackberry, raspberry, 
and wild rose, as also in red-bud. It is an early spring weevil, ovi- 
positing in the buds, which soon drop to the ground, where the larva 
transforms to the pupastage. It is parasitized by Catolaccus incertus. 
