A new Chinese Pseudoogeton species and key to the species of the genus (Coleoptera, Tenebrionidae, Amarygmini)

Abstract Pseudoogeton maoxianum sp. n. is described from Sichuan, China. A key to the males of the species of Pseudoogeton Masumoto, 1989 is presented.


Introduction
Pseudoogeton (Tenebrionidae: Amarygmini) was established by Masumoto (1989) with P. amplipennis (Fairmaire, 1897) as the type species. The genus is similar to Plesiophthalmus Motschulsky, 1858, but it can be distinguished from the latter by the absence of hind wings or shortened hind wings.
Although Bremer and Lillig (2014) are of the opinion that the absence of hind wings is not a satisfactory character state to separate the genus from Plesiophthalmus; still, Pseudoogeton is retained as a separate genus until other characters are found to justify its status or to merge it with Plesiophthalmus.
Working on Chinese specimens of the genus deposited in the Museum of Hebei University (MHBU), Baoding, a new species was found, which was collected by the authors in Sichuan Province of China in 1999. In this paper the new species is described and a key to males of the species of Pseudoogeton is presented.

Material and methods
The photos were taken with a Leica DFC 450 digital microscope camera attached to Leica M205A stereomicroscope. The aedeagus was dissected, cleared in 5% NaOH solution, and placed in glycerin for observation and imaging. Images were edited using Adobe Photoshop CS6. The terminology follows Masumoto (2010). All measurements given are in millimeters. The type specimens are deposited in MHBU, Baoding, China.

Key to the species of Pseudoogeton (males)
P. ovipenne from Hubei whose holotype is female is not in the key. Diagnosis. The new species is characterized by the following: pronotum nearly hemispherical, widest in middle; elytra strongly convex, with fine strial puncture; apicale of aedeagus stouter, ratio of length/width = 1.4; basale 1.9 times longer than apicale.
Scutellum widely triangular, with a few punctures. Elytra ovate, approximately 1.5 times as long as wide, approximately 2.6 times longer and 1.3 times wider than pronotum. Dorsum convex, maximum height at basal third, widest at basal 2/5, lateral sides roundly narrowed anteriorly and posteriorly. Disc with rows of tiny and sparse punctures, their distance equal to 3-4 times of puncture diameter; intervals flat and wide, transversely micro-aciculate, with extremely tiny punctures; lateral margins finely beaded.
Female: Body stouter than male (Fig. 2), pronotum 1.5 times as wide as long, elytra ovate, about 1.4 times as long as wide, about 3.0 times longer and 1.4 times wider than pronotum; prosternum groove between the coxae shallow.
Etymology. This specific epithet is derived from the type locality, Maoxian County, Sichuan Province, China.