DESCRIPTIONS OF THE IMMATURE STAGES OF

The immature stages of Calleida viridipennis (Say) and Plochionus timidus Haldeman are described, including the egg, three larval instars, and pupa. Figures are provided that illustrate the dorsal aspect of the head capsule, pygopod and urogomphi, and a dorsal view of the 3rd instar larva of each species. Calleida viridipennis is compared with C. decora, C. punctata, and P. timidus. Carabids are important components of many ecological systems (Thompson 1979). Both adults and larvae of Calleida viridipennis (Say) and Plochionus timidus Haldeman were reported by Braun et al. (1990) as important arboreal predators of the fruittree leafroller, Archips argyrospila (Walker), which has infested baldcypress, Taxodium distichum (L.) Richard, in Louisiana since 1983 (Goyer and Lenhard 1988). According to Csiki (1932), there are 11 species of Calleida in the United States and 177 species in the world. Thompson (1979) summarized 14 species of Calleida occurring in North America. Four species of Plochionus occur in the U.S. (Csiki 1932; Thompson 1979). Unfortunately, the immature stages of these two genera are poorly known, although head capsule measurements of four species, including P. timidus, were recorded in van Emden's (1942) key to the genera of larval Carabidae, the head capsules, cerci, tarsi, and claws of P. timidus and C. decora were illustrated by Thompson (1979), and the head capsule of C. punctata was drawn by Bousquet (1991). The purpose of this paper is to provide detailed descriptions and illustrations of the immature stages of C. viridipennis and P. timidus. Additionally, comparisons are made with the larvae of C. decora and C. punctata.