PROC. ENTOMOL. SOC. WASH. 88(4), 1986, pp. 680-683 NEW RECORDS FOR XYLOSANDRUS AND XYLEBORUS SPECIES (COLEOPTERA: SCOLYTIDAE) J. B. Chapin and A. D. Oliver Department of Entomology, Louisiana Agricultural Experiment Station, Lou-isiana State University Agricultural Center, Baton Rouge, Louisiana 70803. Abstract. —Xyleborus validus Eichhoff, X. tachygraphus Zimmermann, and Xy-losandrus crassiusculus (Motschulsky) are reported from Louisiana for the first time, and the latter two species are new state records for Arkansas and Florida, respectively. Xyleborus planicollis Zimmermann is also a new state record for Arkansas. Additional locality and host records are given for Xylosandrus com-pactus (Eichhoff), X. germanus (Blandford), Xyleborus obliquus (LeConte), and X. lecontei (Hopkins). Four introduced scolytids have been collected in Louisiana in recent years including Xyleborus validus Eichhoff" and Xylosandrus crassiusculus (Motschul-sky), which are reported from the state for the first time. A new Florida state record is given for the latter species. The first records of Xyleborus planicollis Zimmermann and X. tachygraphus Zimmermann in Arkansas and for the latter species in Louisiana are also given. Additional locality and host records are re-ported for Xylosandrus compactus (Eichhoff), X. germanus (Blandford), Xyleborus obliquus (LeConte), and X. lecontei (Hopkins). The black twig borer, X. compactus, is probably of southeast Asian origin according to Wood (1977). He (1977, 1982) reported its occurrence in Florida in 1941, in Mississippi in 1968, and in Georgia, possibly in 1975. In Louisiana, this species was first collected in twigs of Magnolia grandiflora L. in New Orleans on May 6, 1976 (Cancienne, 1976a) and later that year from Jefferson and St. Tam-many Parishes (Cancienne, 1976b). Oliver (1978) reported infestations in two additional parishes and reviewed its life cycle and economic importance. In ad-dition to the ones from New Orleans, specimens were examined from the following five parishes: Ascension, Prairieville, 13-X-1977; Beauregard, 5 mi. S DeRidder, March 25, 1982 (EGR); East Baton Rouge, Baton Rouge (21 -XI-1977; Place DuPlantier Apts., 13-111-1984, flight trap; 17-IV-1984, em. from Koelreuteria paniculata [male]); Point Coupee, 10-V-1978, boring in pecan trunk (male); and St. Tammany, Pearl River, 29-VII-1976; four of these records are from M. gran-diflora. In 1976, this species was also reported for the first time in Mobile and three other counties in Alabama (McQueen, 1976) and in North Charleston, South Carolina, and later from other localities in the latter state (Hardee et al., 1980). Dixon and Woodruff (1982) discussed its distribution, hosts, and biology in Flor-ida.