PROC. ENTOMOL. SOC. WASH. 108(4), 2006. pp. 938-944 TWO NEW SPECIES OF TREMEX (HYMENOPTERA: SIRICIDAE) REARED FROM CASTANOPSIS AND SYMPLOCOS IN JAPAN ICHIJI TOGASHI 1-chome, Tsurugihonmachi, Hakusan shi, Ishikawa Prefecture 920-2121, Japan Abstract. — Two new species of woodwasps from Japan, Tremex sudajii and Tremex kurokivorus, are described and illustrated. A key is provided for the nine Japanese species of Tremex. Tremex sudajii emerged from Castanopsis cuspidata sieboldii Nakai (Fagaceae) and T. kurokivorus emerged from Symplocos lucida nakaharai Makino (Symplocaceae). Key Words: Symphyta, Siricidae, Tremex, food plants I received two female specimens of Tremex Jurine from E. Makihara of the Forestry and Forest Products Research Institute, Tsukuba City. These emerged from wood of Castanopsis cuspidata sieboldii Nakai and Symplocos lucida nakaharai Makino in Anami-oshima and Okinoerabujima, Kagoshima Pre-fecture, Kyushu, Japan. Tremex includes about 31 world species, most of which occur in eastern Asia. Seven species are known in Japan. After comparison of the two females with the other Japanese species and the available literature on Asian Tremex, I concluded that these specimens represent two new species, and I describe them below. They can be separated from other Japanese species by the following key. Key to Females of Japanese Species OF Tremex 1 . Antenna entirely black or black, with apical half white; apical half of forewing infuscate 2 -Antenna entirely fulvous or brownish black to black, sometimes b<isal 3-4 segments reddish yellow; forewing yellowish hyaline 3 2. Apical half of antenna white; basal half of fore-and hind wings hyaline; 2"'^' to 3"^^ abdominal tergites yellowish white; legs black with basal halves of tibiae, entire basitarsi, and 5th tarsal segments yellowish white; 1^' to last abdominal tergites pol-ished apicalis Matsumura Antenna entirely black; basal Va and apical half of fore-and hind wings infuscate (Fig. 1); abdominal tergites entirely black (Fig. 1); legs entirely black; 2nd to 5ih abdominal tergites distinctly, closely, and reticulately sculptured, matt (Fig. 9a), 6'h to last tergites sparsely punctured (Fig. 9b) sudajii. n. sp. Pronotum long, medially nearly as long as ocello-occipital line (OCL) (ratio about 1.0:1.0) 4 Pronotum short, medially shorter than OCL (ratio about 1.0:1.3-1.6) 5 Antenna brownish black; 8'h abdominal tergite nearly as long as three preceding tergites combined; precornal basin nearly as long as broad longicollis (Konow) Antenna fulvous; 8"i abdominal tergite nearly as long as four preceding tergites combined; precornal basin broader than long contraclus Maa Anterior portion of 8>h tergite reddish yellow or yellow with posterior black; anterior ''4 or -/j of 2"^ tergite yellow and posterior black 6 Eighth tergite with black band in middle (sometimes posterior half with two reddish yellow maculae or posterior half black); 2"'' tergite entirely reddish yellow 7 Anterior half of 8'ii tergite reddish yellow or yellow with black posteriorly; 3"^' anlen-
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