PROC. ENTOMOL. SOC. WASH. 95(2), 1993. pp. 245-252 ANTENNAL SENSILLA OF THE CHINESE LANTERN FLY, PYROPS CANDELARIA L. (HOMOPTERA: FULGORIDAE) Gerald T. Baker and Angsumarn Chandrapatya (GTB) Department of Entomology, Mississippi State University, P.O. Drawer EM, Mississippi State, Mississippi 39762, U.S.A.; (AC) Department of Entomology, Kasetsart University, Bangkok, 10900, Thailand. Abstract. —The antennal pedicel oiPyrops candelaria has four types of sensory receptors: sensilla basiconica, sensilla campaniformia, sensilla chaetica and plaque organs. Porous and multi-innervated, sensilla basiconica are situated among the plaque organs on the female and male antennae. Sensilla campaniformia occur individually or in pairs on the pedicel. A single, large and fluted sensillum chaeticum is situated on the apex of the pedicel near the flagellum. Plaque organs cover the surface of the pedicel. They vary in size and consist of a central portion of pitted cuticular folds that may or may not be branched. This central area is surrounded by guard setae. The amphora-shaped flagellum has a long extension and an opening that leads to an atrium. Three sensilla basiconica are situated on the atrial walls. Sensillum chaeticum is the only type of sensillum to be situated on the scape and about 20 of these sensilla form an encircling band around the scape. Key Words: Homoptera, Fulgoridae, Pyrops, antenna, sensilla Introduction Pyrops candelaria L., Chinese lantern fly, feeds on several horticulturally important plants such as longan, Dimnocarpus longan Lour., mango, Mangifera indica L., and li-tchi, Litchi chinensis Sonn., in China and southeast Asia. This very large homopteran (3-4 cm in length) at times can reach num-bers at which it can do severe economic damage. Basically, the antenna consists of a scape, which is very flexible; a large, bul-bous pedicel which is covered with plaque organs; and a flagellar annulus, which is am-phora-shaped with a long slender extension. The ultrastructure of the plaque organs was described by Lewis and Marshall ( 1970), Marshall and Lewis (1971), and Marshall (1973). Marshall and Lewis (1971) showed that the changes in plaque organ complexity are in accordance with the taxonomic clas-sification of Fulgoroidea by Metcalf (1951). Since there is no current information about the other sensilla on the antennae off. can-delaria, this paper provides an account of the morphology, number, and distribution of sensilla that are found on the antennal annuli of P. candelaria. Materials and Methods Specimens off. candelaria were collected on longan trees at Su-won Farm Res. Sta-tion of Kasetsart University, Thailand. For transmission electron microscopy (TEM), antennae were fixed over-night in Kamov-sky's fixative in cacodylate buffer, pH 7.2 at 4°C. After rinsing, the specimens were placed in 2% osmium tetroxide for 4 hours on ice. The specimens were then washed in distilled water, dehydrated in ethanol, and embedded in Spurr's low viscosity resin.
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