. Eastern forest insects . COURTESY ILL. NAT. HIST. SURV. Figure 198.—Large oak-ap- ple gall caused by Amphi- bolies confluenta. Dryocosmus quercuspalustris (0. S.) (=Callirhijtis palustris), the succulent oak gall, occurs from southern Canada and New England to Iowa and Florida. It produces somewhat circular, suc- culent galls from 9 to 12 mm. in diameter on the leaves or axils of staminate flowers of red oaks. The galls are fleshy walled and hollow, except for a free-rolling cell about mm. in diameter. Xanthoteras forticorne (0. S.) (=Biorhiza forticornis), the oak fig gall, produces gal
. Eastern forest insects . COURTESY ILL. NAT. HIST. SURV. Figure 198.—Large oak-ap- ple gall caused by Amphi- bolies confluenta. Dryocosmus quercuspalustris (0. S.) (=Callirhijtis palustris), the succulent oak gall, occurs from southern Canada and New England to Iowa and Florida. It produces somewhat circular, suc- culent galls from 9 to 12 mm. in diameter on the leaves or axils of staminate flowers of red oaks. The galls are fleshy walled and hollow, except for a free-rolling cell about mm. in diameter. Xanthoteras forticorne (0. S.) (=Biorhiza forticornis), the oak fig gall, produces galls on the leaves, twigs, and stems of white oaks in the Eastern States north of Virginia. Early in the season they are reddish and bladderlike. Sometimes they occur in dense clusters several inches long around a twig. When they do, the irregular masses look like pressed figs. SUPERFAMILY PROCTOTRUPOIDEA As far as known, all members of this superfamily are parasitic on the immature stages of other insects. The group as a whole seems to be rather poorly known, and most of the North American species are still undescribed. The adults of the majority of species are black, often shiny, and small to extremely small in size. The smaller ones resemble chalcids, but differ in having the pronotum extend laterally to the tegulae and the ovipositor issue from the end of the abdomen. In many of the smaller species, the wings are almost veinless; in others, the wings are entirely absent. FAMILY EVANIIDAE Members of this small family of spider-like wasps are parasitic in the egg capsules of cockroaches. Adults are about 10 to 15 mm. long and are distinguished by very small, oval abdomens attached by petioles to the propodeum considerably above the base of the hind coxae. The majority of described species occur in eastern United States. 482
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Keywords: ., bookcentury1900, bookcollectionbiodive, booksubjectforestinsects
