Diplocheila (Isorembus) zeelandica (L. Redtenbacher 1867)

Diplocheila (Isorembus) zeelandica (Redtenbacher)
Rembus zeelandicus Redtenbacher, 1867: 10, t. 1, fig. 5. Type locality: Auckland, New Zealand; (determined from original description).
Rhembus zeelandicus von Heyden, 1879:330. — Andrewes, 1923 (1924) : 464.
Submera zeelandica Habu, 1956:58, figs. 7, 13, 19, 23, 28.
Rhembus gigas Bates, 1873 : 256.— Andrewes, 1923 (1924) : 464.— Putzys, 1875 :49.
The diagnostic features of this species are indicated in the key. In non-genitalic characters D. zeelandica is most like pinodes. The shape of the female stylus is distinctive except for one specimen from Japan with a stylus like that of D. laevis.
Description of sculpture. — (female, Kweiling, Kwangsi, China) Museum of Comparative Zoology Coll. Microsculpture forming isodiametric meshes on dorsal surface of head and pronotum, weakly transverse meshes on ventral surface, the latter very weakly iridescent, head and pronotum micropunctate, pronotum and elytra microgranulate. Macrosculpture : head, post-orbital area with fine, transverse anastomosing lines, interorbital area laterally with a few deeper, longitudinal lines, front with a single transverse line, frontal impressions with
numerous fine lines, pronotum with shallow but distinct transverse lines, anterior margin medially with short longitudinal lines, prosternum with transverse lines, medially, area between lines rugulose, proepisternum with short longitudinal lines, areas between microgranulate, not rugulose, pterosterna medially smooth, laterally with anastomosing zig-zag lines ; mesand metepisterna with anastomosing zig-zag lines ; surface of elytral intervals 8 and 9 rugulose, abdominal sternites with irregular longitudinal lines laterally, medially with very shallow transverse lines, 6th sternite micropunctate.
Variation. — Size varies as follows: 9 males, length 20.9-24.1 mm. (mean 21.9 mm.), width 9.0-10.1 mm. (mean 9.6 mm.); 4 females, length 20.3-21.4 mm. (mean 21.0 mm.), width 8.8-9.7 mm. (mean 9.4 mm.). The sculpture pattern is the same as described above, lines of macrosculpture on the pronotum being much finer in two specimens from Kyoto, Japan, and much deeper in one specimen from Nanking, China.
The pronotum (see fig. 34) varies in shape from more cordate than is usual (male, Pei Bey) to less so, with the sides less sinuate posteriorly (male, Peking). The metepimeron is obliquely truncate apicolaterally, not sinuate or broadly rounded. Surface lustre is silky in Chinese specimens, more glossy in specimens from Kyoto, Japan, but not nearly so glossy as in laevis Lesne. The number of setigerous punctures on the 6th abdominal sternite varies as follows : males, four setae in eight specimens, three setae in one specimen ; females, seven setae in one specimen ; six setae in three specimens.
A female from Fu-Chau, Fukien Province has the blade of the retractile stylus broader than in fig. 65, emargination near apex more pronounced ; a female from Pei Bey — as in fig. 65 but blade somewhat broader; specimen from Kyoto, Japan, differs from fig. 65 in that the blade is shorter, broader, with apex obliquely truncate. The median lobe of the male is as in fig. 78.
Synonymical Notes. — The synonymy presented above was suggested by Bates (1873) when he described R. gigas, and was verified by Andrewes ( 1924). Probably the type locality of zeelandica as given by Redtenbacher is erroneous, as neither this species nor any other species of Diplocheila has ever been taken in New Zealand or Australia, and the likelihood of its occurring there is slight. I propose eastern China as a new type locality, as the type specimen probably came from there. A type locality has not been designated for Diplocheila gigas Bates. I suggest that Nagasaki, Japan be regarded as type locality as this was the first locality listed by Bates for the specimens on which the name was based.
Distribution. — This species ranges from Korea southward to Kwangsi Province, China, on the mainland, and is found in southern Japan and Formosa.
Nine males and four females have been examined in this study, collected in the following localities.
Japan: Kyoto and vicinity, October, 1945. China: Kwangsi Province — Kweiling, April ; Wuchow, April ; Szechuan Province — Pei Bey, June ; Peking, Nanking, spring; Fukien Province — Fuchau. Formosa.