(Proceedings submission caseby-case

DEUVE ET AL.: CARABID BEETLE FAUNA OF THE GAOLIGONG MOUNTAINS 363
Gaoligong Shan in the northern part of Core Area 7. This area is not within the geographical range
of any other Agonotrechus species, although A.xiaoheishan has been recorded from the adjacent
Core Area 6 on the western slope of the Gaoligong Shan, 13.3 km to the south.
OVERALL GEOGRAPHICAL DISTRIBUTION.— This species currently is known only from the type
locality in the southern part of the Gaoligong Shan, in western Yunnan Province, China.
Genus Minutotrechus Deuve and Kavanaugh, gen. nov.
TYPE SPECIES.— Stevensius minutus Uéno, 1997.
DERIVATION OF GENUS GROUP NAME.— The genus group name (masculine) is a combination
of the Latin adjective, minutus, meaning very small, and the generic name, Trechus, in reference to
the small size of members of this genus.
DIAGNOSIS.— Adults of this genus (Fig. 11a) can be recognized by the following combination
of character states: size small (BL = 2.7 to 2.9 mm), apterous, body color brown to black; head
large with small but protruding eyes, their diameter shorter than length of tempora; mandibles
short, obtusely bidentate, mentum and submentum at least partial fused, labial suture partially perceptible,
mentum with medial tooth truncate; pronotum small, cordate, narrow (ratio Pw/PL =
1.25), very convex, globulose, glabrous, basal angles small and subrectangular, slightly obtuse,
with basal margin broadly lobate, basal area convex, both midlateral and basolateral setae present;
elytra ovoid and markedly convex, with discal striae 2 to 8 striae effaced, stria 1 deeply impressed
and punctate, both anterior and middle discal setae present, preapical seta absent, lateral groove
abruptly terminated anteriorly at humerus; legs short, protibiae without longitudinal furrows.
COMMENTS.— This new genus is known from only six female specimens that were originally
assigned by Uéno (1997) to genus Stevensius Jeannel (1923) of the eastern Himalayan region.
However, they can be distinguished from members of that genus by their smaller head size, protibiae
without longitudinal furrows, pronotum more cordate and with basal angles smaller and basal
margin broadly lobate and elytra with the lateral groove abruptly terminated anteriorly at humerus.
Minutotrechus appears to be more closely related to Hubeitrechus Deuve (2005), but its members
can be distinguished from those of the latter in having the mentum and submentum at least partial
fused, the mandibular teeth short and obtuse, the pronotum with the median basal area more convex
and basal margin broadly lobate and without margination, and lateral groove abruptly terminated
at the humerus. Because no male specimens of Minutotrechus have been collected to date,
we do not know if male protarsomeres 1 and 2 are elongate as in males of Hubeitrechus or broad
as in Stevensius males. Members of this new genus can also be compared with those of Uenoites
Belousov and Kabak (2016), from which they differ in having the right mandible obtusely bifid
(tridentate in Uenoites members), the protibiae without longitudinal furrows (longitudinal furrows
present in Uenoites members), the mentum and submentum at least partial fused (not fused in
Uenoites members), elytra with only two discal setae (three or more discal setae present in
Uenoites members), the preapical seta absent (present in Uenoites members) and the lateral groove
abruptly terminated at humerus (gradually narrowed anterior to humerus in Uenoites members).
GEOGRAPHICAL DISTRIBUTION.— This genus currently is known only from the type species,
which is known only from the southern part of the Gaoligong Shan region of western Yunnan
Province, China.
Minutotrechus minutus (Uéno, 1997)
(Figs. 11, 46–48)
Stevensius minutus Uéno, 1997:182. Holotype, a female, in NMST. Type locality: China, Yunnan, Gaoligong
Shan, Tengchong County, Dabei, 2430 m.
Minutotrechusminutus (Uéno) NEW COMBINATION.