Saprinus auricollis Marseul, 1855: 390 [Iles Philippines]; Dahlgren 1971: 49; Nakane, 1977: 148 [Ogasawara Isles.].
Saprinus cyaneocupreus Marseul, 1864: 337, synonymized by Dahlgren, 1967: 220.
Japanese name: Ko-ruri-emma-mushi.
Description. Body length and biometric data are as follows: PPL 4.95, PEL 3.86, APW 1.33, PPW 3.47, PL 1.52, EL 2.28, EW 3.24, ProW 2.00, ProL 0.57, PyL 1.52, PTL 1.19, MSTL 1.19, MTTL 1.62. Body broadly oval and strongly convex. Cuticle strongly shining with purple metallic lustre on pronotum and dark green metallic lustre on elytra; funicle of antennae and tarsi dark rufopiceous; tibiae black.
Frontal stria of head complete and carinate. Supraorbital stria complete and evenly arcuate. Disk of front sparsely covered with moderate punctures, which are separated by two to three time their diameter; interspace among the punctures with microscopic punctures. Epistoma sparsely punctate, the punctures being a little coarser than those of frontal disk. Labrum broadly depressed anteriorly.
Pronotal sides (Fig. 132) evenly arcuate and feebly convergent on basal three-fourths, thence strongly arcuate and convergent to apices. Apical angles obtusely angulate. Marginal stria carinate and complete. Disk densely covered with large, round, and deep punctures on longitudinal area along the sides, the punctures becoming finer on basal fourth; interspace among the large punctures smooth, occasionally clothed with microscopic punctures; narrow lateral band along the side with dense and fine punctures; base with two or three rows of large, deep and longitudinal punctures, the rows absent on median fifth of posterior margin of pronotum, and becoming finer laterally; elsewhere sparsely clothed with microscopic punctures.
Epipleura of elytra even; surface between epipleural and elytral marginal striae smooth, shining, with a row consisting of sparse and fine punctures; inside marginal elytral stria finely punctate, the punctures being separated by two to three times their diameter. Marginal epipleural stria lightly carinate and complete. Marginal elytral stria heavily carinate, complete and densely with coarse punctures; its apical end extending inwards, reaching lateral fourth of apical margin of elytron. External subhumeral stria present on basal fourth. Internal subhumeral stria nearly complete and densely crenate. Oblique humeral stria present on basal third and its apical portion fused with the basal portion (nearly on basal third of elytron) of internal subhumeral stria, so that they appear to be a single stria. First to 4th dorsal striae present on near basal half and densely crenate with coarse punctures; 2nd a little longer than the 1st; 3rd a little shorter than the 1st; 4th as long as the 1st. Fifth dorsal stria absent. Sutural stria strongly carinate, sparsely crenate and abbreviated on basal fourth. Surface of elytra, excepting flanks, mediobasal area and extreme apices (around apical stria), densely covered with coarse punctures, which are half as coarse as those of the longitudinal lateral area of the pronotum, becoming finer apically, and separated by their own diameter to twice the dimeter; interspace among the punctures occasionally with fine punctures; flanks evenly covered with fine punctures which are separated by two or three times their diameter; mediobasal area, that is, basal half of elytra inside 4th dorsal stria sparsely clothed with microscopic punctures; area inside the apical stria densely covered with fine punctures.
Propygidium densely covered with coarse, round and shallow punctures, which are as coarse as the coarse elytral punctures; interspace among the punctures with lightly impressed, fine and irregularly transverse alutaceous microsculptures, and sometimes with fine punctures. Pygidium (Fig. 132) sparsely with deep punctures, which are as coarse as the propygidial ones; interspace among the punctures with alutaceous microsculpture basally, but elsewhere smooth and sometimes with fine punctures.
Anterior margin of median portion of prosternum nearly straight. Ventral disk of keel even, but slightly descended on apical sixth; surface of disk sparsely with fine punctures. Anterior marginal stria strongly carinate, nearly straight, but feebly and inwardly arcuate medially. Carinal striae strongly carinate and complete. Descending lateral stria strongly carinate, its apical end attaining to apical sixth of keel.
Anterior margin of mesosternum deeply emarginate medially. Marginal stria complete and strongly carinate. Disk sparsely with coarse punctures and other fine punctures intermingled among coarse ones. Meso-metasternal suture lightly impressed, and with a line which is densely and coarsely crenate. Intercoxal disk of metasternum sparsely clothed with microscopic punctures, these becoming coarse basally; a transverse apical band densely with the coarse punctures. Lateral metasternal stria strongly carinate, extending obliquely and posteriorly, and present on basal three-fourths. Lateral disk densely covered with large, round and shallow punctures, these progressively becoming sparser and finer apically. Metepisternum broad, and densely covered with large, shallow and longitudinal punctures.
Intercoxal disk of 1st abdominal sternum sparsely with microscopic punctures except along anterior margin and behind anterior corner, these parts being densely and coarsely punctate; also with an apical transverse row which consists of moderate punctures. Lateral stria of the disk strongly carinate basally and complete.
Protibia with 9 spinules on outer margin, the apical three and basal two small.
Male genitalia as shown in Fig. 133.
Remarks. Saprinus cyaneus auricollis can easily be recognized
by the color of the body, which is purple on the pronotum and
green on the elytra.
[Ogasawara Isles.] 1Åâ, Bonin Is. vii, 1969.