PROC. ENTOMOL. SOC. WASH. 105(2), 2003. pp. 312-319 ANNOTATED LIST OF THE BARK AND AMBROSIA BEETLES (COLEOPTERA: SCOLYTIDAE) OF DELAWARE, WITH NEW DISTRIBUTIONAL RECORDS Robert J. Rabaglia and Michael A. Valenti (RJR) Forest Pest Management, Maryland Department of Agriculture, 50 Harry S. Truman Parkway, Annapolis, MD 21401, U.S.A. (e-mail: rabaglrj@mda. state. md. us); (MAV) Delaware Department of Agriculture, 2320 South DuPont Highway, Dover, DE 19901, U.S.A. Abstract. — A total of 64 species of Scolytidae are reported from Delaware. Fifty-one species are reported for the first time: Hylastes porcitlus Erichson, H. salebrasus Eichhoff, H. tenuis Eichhoff, Hylurgops rugipennis pinifex (Fitch), Hylesinus aculeatus Say, Den-droctonus frontalis (Zimmermann), D. valens LeConte, Cnesinus strigicollis LeConte, Phloeotribiis liminaris (Harris), Phloeosinus dentaliis (Say), Carphoboriis bifurcus Ei-chhoff, Hylocurus ritdis (LeConte), H. flaglerensis Blackman, Micracisella opaciicollis (LeConte), Thysanoes fimbricornis LeConte, Ips grandicollis (Eichhoff), /. pini (Say), Orthotomiciis caelatiis (Eichhoff), Pityogenes hopkinsi Swaine, Dryoeocetes autographits (Ratzeburg), D. granicoUis (LeConte), Lymantor decipiens (LeConte), Xyloterinus politus Say, Ambrosiodmus obliqiuis (LeConte), A. rubricoUis (Eichhoff), A. tachygraphus (Zim-mermann), Eiiwollacea validus (Eichhoff), Xyleborus atratiis Eichhoff, X. celsiis Eichhoff, X. ferrugineus (Fabricius), X. pelliculosus Eichhoff, X. pubescens Zimmermann, X. sayi (Hopkins), Xylosandnts crassiuscidus (Motschulsky), X. germanus (Blandford), Hypoth-enenms crudiae (Panzer), H. dissimilis (Zimmermann), H. eruditiis Westwood, Cono-phthorus coniperda (Schwarz), Corthylus colwnbianus Hopkins, Gnathotrichus materiar-iiis (Fitch), Monarthritm fasciatum (Say). M. mali (Fitch), Pityophthonis cariniceps LeConte, P. confusus Blandford, P. Uqiddambarus Blackman. P. opacidus LeConte, P. piiberuhis (LeConte), P. scriptor Blackman, Pseitdopityophthoriis minutissimiis (Zimmer-mann), P. pubescens Blackman. Fourteen of the species are not native to North America. Key Words: Scolytidae, distribution, Delaware Though its geographical area is compar-aware (Taber 1939). About one third of the atively small, Delaware exhibits an extraor-land in Delaware is covered with mostly dinary diversity of tree species and forest second and third growth forests represent-associations. Due to its location in a north/ ing a fragmented patchwork of the original south floral transition zone, many of the contiguous forest. forests that typify northern, central, and The diversity of tree species and forest southern regions of the eastern United associations in Delaware is not adequately States can be found in Delaware (Tatnall reflected by the previously documented 1946, Phillips 1978). Of the approximately members of the Scolytidae in the state 600 species of trees native to the entire (Wood and Bright 1992). Such a disparity United States, about 1 15 are native to Del-prompted a preliminary survey of this im-
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