(Proceedings submission caseby-case

424 PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES
Series 4, Volume 63, No. 12
end abruptly terminated in the posterior end of stria 5. Parascutellar setiferous pore present at base
at common origin of discal striae 1 and 2. Only one discal setiferous pore present, inserted at anterior
two-fifth of elytral length next to stria 3. Only one discal setiferous pore present, inserted
slightly anterior to middle next to stria 3. Preapical seta present, inserted on interval 3 next to stria
2 and about equidistant from apical and sutural elytral margin. Umbilicate setal series with setae of
humeral group equidistance from each other and setae of median group inserted slightly posterior
to middle.
Legs. 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. 31b) with sagittal aileron very small, shaft moderately
broad basally, then gradually narrowed apically to a narrowly rounded apex; endophallus with a
faintly sclerotized scaly area distinctly elongate and narrowed distally.
COMMENTS.— This species appears to be very closely related (perhaps sister species) to
T.monochaetus, but its male members can be distinguished from those of the latter by having the
base of the median lobe of the male aedeagus narrower (broader in T.monochaeta members, see
Fig. 30b) and the scaly sclerotized area of the endophallus distinctly narrowed distally (of more
equal width throughout in T.monochaeta males).
HABITAT DISTRIBUTION.— Members of this species have been collected by sifting leaf litter
from forests of scattered, large Abies sp. trees with a dense understory of bamboo or Rhododendron
spp. at elevations ranging from 3221 to 3290 m. Specimens of Trechus shiyueliang andT.
shibalicus were collected in one or more of the same litter samples. Specimens of T.unipilosa were
also collected at 3100 m elevation under stones at the open edges of a small stream draining a
north-facing glacial cirque with a large snowfield in its basin (Fig. 40b). A specimen of Trechepaphiopsis
unisetulosa sp. nov. was also collected in this area, at the upper limit of the altitudinal
range of this last mentioned species.
GEOGRAPHICAL DISTRIBUTION WITHIN THE GAOLIGONG SHAN.— Fig. 31c. we examined a
total of 18 specimens (13 males and 5 females) from sites on the eastern slope of the northcentral
part of the Gaoligong Shan in Fugong County (see Type material above for exact collection data).
All of these sites are in Core Area 3.
OVERALL GEOGRAPHICAL DISTRIBUTION.— This species currently is known only from Fugong
County in the northcentral part of the Gaoligong Shan region, western Yunnan Province, China.
Genus Epaphiotrechus Deuve and Kavanaugh, gen. nov.
TYPE SPECIES.— Epaphiotrechus fortipesoides sp. nov.
Derivation of genus group name.— The genus group name (masculine) is a combination of
two other trechine generic names, Epaphius and Trechus.
DIAGNOSIS.— Adults of this genus (Fig. 33a) can be recognized by the following combination
of character states: size large (BL = 4.5 to 4.7 mm), apterous; body color dark piceous with elytral
interval 1 and lateral areas of pronotum and elytra more or less reddish; dorsum shiny, distinctly
iridescent, dorsal surface glabrous except for isolated fixed setae typical for trechines, eyes also
glabrous; right mandible (Fig. 16g) with premolar not fused with retinaculum but closely associated
with the latter [possibly representative of an intermediate state in the evolution of the “bidentate”
mandibular type (see discussion above for genus Trechus)], anterior tip of retinaculum
enlarged as a distinct tooth and displaced anteriorly (but not quite as far as in members of Trechepaphiopsis
species); pronotum with basal angles small and rectangular; elytra elongate, oblong,