Caliroa slug sawflies of Japan (Hymenoptera, Tenthredinidae) Author Hara, Hideho Nishi 4 Kita 3 4 - 29, Bibai, Hokkaido 072 - 0033, Japan. E-mail: harahideho @ bell. ocn. ne. jp Author Ibuki, Shinichi Wami 1355 - 13, Nakagawa, Tochigi, 324 - 0612 Japan. E-mail: banbi-fa @ ktd. biglobe. ne. jp text Zootaxa 2020 2020-05-04 4768 3 301 333 journal article 22416 10.11646/zootaxa.4768.3.1 a068f737-c024-4d3d-b88b-665915062ec6 1175-5326 3783994 C8036F69-F881-4727-96E7-C78AA6C7F920 Caliroa ouensis Hara sp. nov. ( Figs 2C, D , 3S , 4L , 5F , 8E, F , 11 M–O) Caliroa annulipes : Hara, 2011: 379 [part]. Not Klug (1816) . ? Caliroa annulipes : Togashi, 1972: 217 ; Abe & Togashi, 1989: 547 . Description: female and male . Length 5.0–6.0 mm in female, 5.0– 5.3 mm in male. Black, shiny with colorless reflection ( Fig. 2C, D ). Labrum dark brown. Mandible black, apically reddish brown. Palpi dark brown, basally black. Legs black; fore and middle femora yellow brown apically; fore and middle tibiae and tarsi yellowish white, apically slightly darkened; hind tibia yellowish white on basal fourth to third in female, on narrow base in male; hind first tarsomere basally yellowish white. Wings blackish on basal two thirds, colorless transparent on apical third; veins and stigma brown to black. Postocellar area 1.6–1.8 × as wide as length behind lateral ocellus, with dull or inconspicuous anterior groove laterally. Clypeus deeply emarginated ventrally; depth of emargination 0.3–0.5 × median length of clypeus. Malar space slightly wider than or about twice as wide as facet of eye in female, about as wide as facet in male; setae absent. First flagellomere 0.6–0.8 × as long as second and third flagellomeres combined ( Fig. 3S ); apical four flagellomeres combined 1.5–1.9 × as long as first flagellomere. Forewing with joint of vein Rs and crossvein 2r-rs located at apical 0.14–0.38 of anterior margin of cell 1Rs2 ( Fig. 2C ); basal corner of cell 1M right-angled. Hind wing of female and male with joint of vein 1A and crossvein cu-a located basal to or at apex of cell 1A ( Fig. 4L ); crossvein 2r-m present or absent; crossvein m-cu present; apex of cell 1A not close to wing margin. Punctures mostly minute or inconspicuous. Head and thorax mostly smooth. Mesoscutellum with only inconspicuous minute punctures. Mesoscutellar appendage smooth, and entirely glabrous or narrowly setose posterolaterally ( Fig. 5F ). Dorsum of abdomen smooth, not microsculptured. Lance ( Fig. 8E ) with dorsal margin slightly serrate apically; serrations angular. Lancet ( Fig. 8 E–H) with 15–16 serrulae; ctenidia pale, ventrally extending to level of base of serrula; middle serrulae rather deep, with two to three anterior and three to four posterior pointed teeth; areas between middle serrulae convex, narrower than adjacent serrula. Male genitalia ( Fig. 11 M–O) in ventral view with harpe widest at two fifths, gently rounded on lateral margin and angularly convex on medial margin. Penisvalve apically hooked. Material examined . Holotype ( Figs 2C, D , 3S , 4L , 8E, F ; figs 1M, 2E, O, 4D–F in Hara, 2011 ): ♀ , “[ JAPAN : Honshu], Mt. Hachimantai, Iwate Pref. , 28. VII. 2004 , A. Shinohara” [cited by Hara (2011) as C. annulipes ]. Paratypes : 1♀ , “25, VII, 1936, Mt. Zaô, Takeuchi” [on upper side] “Col. K. Sirahata” [on underside]; 1♀ , “25, VII, 1939, Mt. Zao, Yamagata , Takeuchi” [on upper side] “[Ogura-sawa (in Japanese)], K. Sirahata” [on underside]; 2♀ 2♂ , “Mt. Zawosan, Miyagi Pref. , VII. 27. 1971 , A. Shinohara”. Etymology . The species name, an adjective, is derived from the Ou Mountains that include the localities of this species, Mount Hachimantai and Mount Zao-san. Distribution . Japan : Honshu. Bionomics . Adults were collected in late July in mountainous areas of northern Honshu. Togashi (1972) recorded Vaccinium uliginosum L. ( Ericaceae ) as the host plant of “ Caliroa annulipes ” in Japan . His specimens may possibly be C. ouensis . Remarks . Caliroa ouensis is very similar to C. annulipes known from Russian Far East to Europe and Canada , but they are different as follows: forewing with basal section of vein M distinctly curved and basal corner of cell 1M right-angled in C. ouensis ( Fig. 1C ), while basal section of vein M relatively weakly curved and basal corner of cell 1M slightly acute C. annulipes ( Lacourt, 2002 ; photos in Taeger et al ., 2018 ); female mesoscutellar appendage glabrous or narrowly setose posterolaterally in C. ouensis ( Fig. 5F ), while mostly setose in C. annulipes ( Fig. 5G ); male genitalia with harpe widest near middle in C. ouensis ( Fig. 11M ), while near base in C. annulipes (fig. 5D in Hara, 2011 ). Hara (2011) stated that “The membranous areas of the lance do not taper and the serrulae are asymmetrical in one Japanese female examined [= the holotype of C. ouensis ; Fig. 8F ], while the membranous areas taper dorsally and the serrulae are nearly symmetrical in European females”. However, these features appear to be unavailable to distinguish these two species. Caliroa ouensis sometimes has the membranous areas tapering dorsally ( Fig. 8G ) and the serrulae similar to those of C. annulipes (compare Fig. 8H with Fig. 8I ). In eastern Palearctic and Oriental species except for C. annulipes , C. ouensis is similar to two Chinese species, C. angustata Forsius, 1927 and C. semicincta Wei, 2007 , and five Japanese species, C. matsumotonis , C. nara , C. nire , C. vaccini (part) and C. zelkovae , in having a black body with colorless reflection, a basally pale marked hind tibia, a basally dark and apically transparent or lighter wings, and a female hind wing with the joint of vein 1A and crossvein cu-a located basal to the apex of cell 1A. It is distinguished from the two Chinese species by apical four flagellomeres combined distinctly longer than a first flagellomere. Apical four flagellomeres combined are about as long as a first flagellomere in the two Chinese species. For the differences from the five Japanese species, see the key above. In the key to western Palearctic species by Lacourt (2002) , C. ouensis goes to the couplet 2, but does not agree with either line of the couplet. In the key to Nearctic species by Smith (1971) , the female of C. ouensis may go to the couplet 11 containing the females of C. labrata MacGillivray, 1909 and C. obsoleta (Norton, 1867) , but it differs from the latter two in having wings darkened on the basal two thirds and hyaline on the apical third [uniformly, lightly infuscated in C. labrata ; uniformly hyaline in C. obsoleta ] and from C. obsoleta by apical four flagellomeres combined distinctly longer than a first flagellomere [subequal in length in C. obsoleta ]. Their lancets are also clearly different (compare Fig. 8E, G with figs 69 and 74 in Smith, 1971 ). In his key, the male of C. ouensis goes to the male of C. cerasi , but they are easily distinguished as stated in the key to Japanese species above.