. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 24 NATURAL CONTROL OF THE COTTON BOLL WEEVIL. The native ants concerned in the control of the weevil are princi- pally of the genus Solenopsis and varieties of the specie- geminata (fig. 2). The principal points in the characterization of this species are as follows: There are two distinct nodes or scales in the slender petiole of the abdomen. All forms but the male have a sting (PI. II, fig. 2). The antennae (PI. II, fig. 3) are ten-segmented; the club is. formed of the last two segments, of which the terminal o
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 24 NATURAL CONTROL OF THE COTTON BOLL WEEVIL. The native ants concerned in the control of the weevil are princi- pally of the genus Solenopsis and varieties of the specie- geminata (fig. 2). The principal points in the characterization of this species are as follows: There are two distinct nodes or scales in the slender petiole of the abdomen. All forms but the male have a sting (PI. II, fig. 2). The antennae (PI. II, fig. 3) are ten-segmented; the club is. formed of the last two segments, of which the terminal one is the longer. Maxillary and labial palpi have each two segments. The clypeus has two longitudinal ridges and the sting is very large. The color varies, but the workers usually seen are of a dark reddish brown, the color of the abdomen being often considerably darker than that of the head and thorax. Length of workers from 2 to 3 mm. These ants form nests near the surface of the ground. All stages of development and forms of adults may be found in these nests practically throughout the summer season. The individuals which are most active, if not in fact those which are alone concerned in the attack upon the weevil, are the smaller w orkers which are commonly to be seen outside of the nests. In Plate II, figures 5 and 6, are shown some of the immature stages of this species. The queen larvse are very much larger than the worker forms as is shown in the illus- tration. The pupae are naked, and as they approach maturity the color gradually changes from a translucent white to a dark brown. The active worker form is shown Fig. 2.—Solenopsis geminata, ant ene- in Plate II, figures 1 and 4. ^n^err Hinat en'arged This species shows a tendency to nest within the shade formed by the plants, and is to some extent out of the reach of ordinary cultivation by being close to the middle of the rows. The breaking up of a nest, however, does not seem to drive them away or to interfere serio
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