Aproceros hakusanus Togashi, 1962

Aproceros hakusanus Togashi, 1962

Aproceros hakusanus Togashi, 1962: 202 ; 1968: 232; Zhelochovtsev & Zinovjev, 1995: 401.

MATERIAL MISIDENTIFIED EXAMINED. Russia: Primorskiy Terr.: vicinity of Spassk [-Dal’niy], 29.VI.1961 (S000), A. Zhelochovtsev leg., 1♀ ( ZMMU); Sikhote-Alin, Syahobe [Serebryanka] River basin, 24.VII.1936, K. Grunin leg., 1♀ ( ZMMU) ( A.N. Zhelochovtsev determination) .

REDESCRIPTION. Female (after Togashi, 1962, only for principal characters). Body length 6.5 mm. Body black, shining; mouthparts yellowish; mandibles at apex red-brown; pronotum and most of mesothorax except posterior margin of scutellum pale brown; basal half of abdomen yellow-brown. Antennae brownish-black. Legs pale orange, fore and middle coxae and apices of hind tarsi darkened. Wings uniformly infuscated, forewings slightly stronger at base, veins and pterostigma dark brown. Head and thorax covered with greyish-white pubescence. Head from above transverse, strongly narrowed behind eyes; POL: OOL: OCL = 2: 3: 1. Supraclypeal area slightly convex, with a sharp median carina; anterior tentorial pit deep, connected with antennal foveae; median fovea punctiform, deep; malar space broad, about twice as long as antennal scape; anterior margin of clypeus nearly truncate. Antennae nearly as long as costa of fore wing. Median lobe of mesonotum (prescutum) with distinct median fold.

Male. Unknown.

DISTRIBUTION. Japan (Honshu). Record from Russia is misidefinition (see below for more details).

REMARKS. All the specimens we studied, identified earlier by Zhelochovtsev as A. hakusanus , should be considered light-coloured forms (Form B) of the summer generation of A. leucopoda , which is confirmed by molecular data. As result, I exclude A. hakusanus from the list of sawflies of Russia.

The type material of A. hakusanus was kept in Togashi's personal collection ( Togashi, 1962), and after his death, the place of storage of the types is unknown and their re-study is now impossible. Perhaps the real range of this species (if it is valid taxon) is limited only to Japan, as the species is not recorded elsewhere outside the country. It is very possible that this taxon may be only a light-coloured form of one of the Japanese species. In favour of this is the light colouration of the body and the strongly constricted head behind the eyes. The unavailability of type specimens or any other specimens makes it impossible to verify the validity of the discussed species .

Many of the features specified by Togashi (1962) in the species description appear to be highly variable in the other two species we studied. Therefore, here we do not give upper the description suggested by Togashi in full, but only the most significant features of this species. The state of such a feature as the furrow of the medial lobe of the mesothorax is highly variable, although it has previously been widely used ( Togashi, 1968) for species distinguishing.