Taxonomic and Zoogeographic Study of the Japanese Phygadeuontinae (Hymenoptera, Ichneumonidae), with Descriptions of 17 New Species Author Watanabe, Kyohei Kanagawa Prefectural Museum of Natural History, 499 Iryuda, Odawara, Kanagawa 250 – 0031, Japan watanabe-k@nh‛kanagawa-museum‛jp text Bulletin of the Kanagawa Prefectural Museum (Natural Science) 2021 2021-03-30 50 55 136 https://doi.org/10.32225/bkpmnh.2021.50_55 journal article 300009 10.32225/bkpmnh.2021.50_55 70224806-ca38-47ca-bd8a-63da3ac532f9 2189-6720 12774639 DD695C62-DC2F-4D32-8D33-52648E28661D Genus Bathythrix Förster, 1869 Ischnurgops Förster, 1869: 175 . Type : Cryptus claviger Taschenberg, 1865 . Designated by Viereck (1914) . Steganops Förster, 1869: 175 . Type : Cryptus claviger Taschenberg, 1865 . Designated by Viereck (1914) . Bathythrix Förster, 1869: 176 . Type : Bathythrix meteori Howard, 1897 . Designated by Viereck (1914) . Panargyrops Förster, 1869: 182 . Type : Cryptus claviger Taschenberg, 1865 . Designated by Viereck (1914) . Gausocentrus Förster, 1869: 198 . Type : Gausocentrus gyrini Ashmead, 1894 (= Hemiteles gyrinophagus Cushman, 1930 ). Designated by Viereck (1914) . Stenoschema Förster, 1869: 220 . Nomen nudum. Leptocryptus Thomson, 1873: 1884 . Type : Cryptus claviger Taschenberg, 1865 . Designated by Viereck (1914) . Agenora Cameron, 1909: 722 . Type : Agenora hirticeps Cameron, 1909 . Monobasic. Six species, Ba. claviger ( Taschenberg, 1865 ) , Ba. kuwanae Viereck, 1912 , Ba. linearis ( Gravenhorst, 1829 ) , Ba. narangae ( Uchida, 1930 ) , Ba. prothorax Momoi, 1970 , and Ba. sericea ( Provancher, 1875 ) , have been recorded from Japan . In this study, I newly record Ba. marginatae Sawoniewicz, 1980 and Ba. thomsoni ( Kerrich, 1942 ) from Japan and newly synonymized Ba. narangae under Ba. kuwanae below. In addition, I record some distributional data of all Japanese species below. Japanese species including unidentified species can be distinguished by the following key. Preliminary key to Japanese species of the genus Bathythrix ( ♀ ) (female of Ba. prothorax is unknown) 1. Face strongly narrowed ventrally, eye almost reaching basal part of mandible ( Figs 13B , 62B ). ........................ Ba. marginatae Sawoniewicz, 1980 -. Face not strongly narrowed ventrally, eye not reaching basal part of mandible (e.g., Figs 12B , 62A, C ). ............................................................ 2 2. Anterior tentorial pit exceptionally large, extending from the margin of clypeus and basal part of mandible to lower eye margin, with long dense setae inside ( Figs 15B , 62C ). And nervellus not intercepted. ...................................................................... 3 -. The combination of above character states lacking. ....................................................................... 5 3. Lower part of occipital carina absent near hypostomal carina. ................................................................ Ba . sp. A -. Lower part of occipital carina complete. ........................................................................ 4 4. T II and T III covered with longitudinal striae ( Fig. 15C ). ...................................... Ba. thomsoni ( Kerrich, 1942 ) -. T II and T III covered with punctures, without longitudinal striae. ......................................................... Ba . sp. B 5. Anterior tentorial pit exceptionally large, extending from the margin of clypeus and basal part of mandible to lower eye margin, with long dense setae inside. The margin of the pit invisible. ...................................................... Ba . sp. D -. Anterior tentorial pit not exceptionally large, without long dense setae inside (e.g., Fig. 62A ). The margin of the pit at least largely visible (e.g., Fig. 62A ). ................................................................. 6 6. T II and T III covered with longitudinal striae. ........................................................ Ba . spp. -. T II and T III covered with punctures, without longitudinal striae. ................................................................... 7 7. T II and T III largely red, with black spots ( Figs 11A, C ). And hind femur and tibia reddish yellow with conspicuous black apex ( Fig. 11A ). ................................ Ba. kuwanae Viereck, 1912 (= Ba. narangae Uchida, 1930 syn. nov. ) -. The combination of character states lacking. ................................................................. 8 8. Ovipositor sheath shorter than 1.3 times as long as hind tibia. And/or metasomal tergites with large red area(s). ............................................. Ba . spp. -. Ovipositor sheath longer than 1.5 times as long as hind tibia ( Figs 10A , 12A ). And metasomal tergites entirely black (posterior margin sometimes narrowly tinged with reddish brown) ( Figs 10C , 12C , 16C ). .................................................... 9 9. Hypostomal carina strongly raised behind the base of mandible. Dorsolateral carina of T I absent beyond the spiracle. Hind coxa and femur dark reddish brown to black ( Fig. 12A ). ..................... Ba. linearis ( Gravenhorst, 1829 ) -. Hypostomal carina not raised behind the base of mandible. Dorsolateral carina of T I present or absent beyond the spiracle. Coloration of hind coxa and femur various. ................................................................. 10 10. Dorsolateral carina of T I at least present beyond the spiracle. Coxae and hind femur reddish brown ( Fig. 10A ). ......................... Ba. claviger ( Taschenberg, 1865 ) -. Dorsolateral carina of T I absent beyond the spiracle. Fore and mid coxa whitish yellow. Hind coxa and hind femur dark reddish brown to black ( Figs 16A, C ). ........................ Ba. sericea ( Provancher, 1875 )