398 PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES Series 4, Volume 63, No. 12 FIGURE 22. Trechus luzhangensis sp. nov.; a. Dorsal habitus (CASENT1017595). b. Median lobe of aedeagus of male (CASENT1017595), left lateral aspect. c. Map of locality records (red circles) for T.luzhangensis in the Gaoligong Shan region. Scale lines a, b = 0.5 mm, c = 100 km.
DEUVE ET AL.: CARABID BEETLE FAUNA OF THE GAOLIGONG MOUNTAINS 399 sagittal aileron, apical lamella short and thick, with apex blunt, endophallus with a sclerotized line and a scaly area. DESCRIPTION.— Size medium, BL = 3.7 to 3.8 mm. Body color dark piceous, shiny, elytra with interval 1, lateral margins and apicomedial area more or less reddish, appendages paler, yellowish-orange, palpi pale yellow. Body surface smooth, head capsule faintly alutaceous. Head. Moderate in size; eyes only slightly projected but convex, their diameter twice as long as tempora, the latter short, moderately convex and glabrous. Frons not flattened; frontal furrows deep, rounded, prolonged and not attenuated posterior to the eyes. Two pairs of supraorbital setae present, the anterior pair inserted in foveae. Clypeus with four setae. Labrum with six setae, anterior margin distinctly concave. Mandibles short; right mandible distinctly tridentate with middle tooth closer to basal tooth (premolar) than to distal tooth. Mentum and submentum not fused but nearly so, suture between them only faintly impressed. Mentum with medial tooth apically truncate, less than half the length of the lateral lobes. Submentum with six setae anteriorly, swollen anteriorly. Gula wide. Genae with a single seta ventrally on each side. Antennae rather short, with about 2 antennomeres extended posteriorly beyond basal pronotal margin; antennomeres 2 and 3 about equal in length, antennomere 4 slightly shorter. Pronotum. Transverse (ratio Pw/PL = 1.46), moderately narrowed posteriorly, greatest width anterior to middle; lateral margins widely rounded, straightened only just anterior to basal angles, the latter very small, but projected, acute and sharp. Disc convex, smooth and glabrous, median longitudinal impression slender but sharply impressed, extended anteriorly to near anterior margin; basal foveae distinct, subcircular; median basal area faintly, longitudinally rugulose, delimited laterally by obliquely curved furrows. Lateral borders of pronotum moderately slender, narrowly reflexed, lateral grooves deeply impressed. Single midlateral setae on each side inserted near anterior one-third; single basolateral seta on each side, inserted at basal angle. Elytra. Ovoid, only slightly more narrowed basally than apically, humeri distinct but rounded. Disc convex and smooth. Striae finely impressed, not or only faintly punctate; striae 1 to 3 deeply impressed on disc, not attenuated apically, remaining striae successively less distinct, the outermost very faint but still evident. Parascutellar striole present. Recurrent stria terminated anteriorly at distinct convexity of interval 7. Basal setiferous pore present at common origin of striae 1 and 2. Two discal setae present and inserted next to stria 3, one at anterior one-fourth and one near middle of elytra. Preapical seta present and inserted in a prediscal position on interval 3, closer to stria 2 than 3 in forward position at apical one-fourth of elytra. Umbilicate setae of humeral group equidistance from each other and setae of median group inserted slightly posterior to middle. Legs. Relatively short, protibiae with longitudinal furrow. Male protarsomeres 1 and 2 dilated and apicomedially toothed. Abdomen. Abdominal ventrites glabrous, except for a single paramedial seta on each side, and ventrite VII of males apically with one pair of paramedial setae, of females with two pairs. Male aedeagus. Median lobe (Fig. 22b) only moderately enlarged basally but with a mediumsized sagittal aileron present; shaft narrow subbasally, progressively thicker toward subapical portion; apical lamella short and thick, with apex blunt, endophallus with a sclerotized line and a scaly area, similar to that seen in males of T.shiyueliang sp. nov. (Fig. 18b). HABITAT DISTRIBUTION.— Members of this species have been found under stones on slopes above (Fig. 43a) and below the road and both side of the pass at an elevation of 3150 m. The habitat in this area includes broken scrub vegetation of two to four meter high bamboo and Rhododendron thickets on a thin layer of organic substrate, as well as open areas with stones on granitic sand substrate, and small seeps. Both specimens were found at the edges of thickets on organic substrate. No other trechines were found at this site.