(Proceedings submission caseby-case

352 PROCEEDINGS OF THE CALIFORNIA ACADEMY OF SCIENCES
Series 4, Volume 63, No. 12
Male aedeagus. Median lobe (Fig. 6b) with apex narrowly lobate, apically rounded.
COMMENTS.— Based on features of form and structure, this species appears to be closely related
to P.pusillus, described from northern Vietnam. Its members can be distinguished from those of
the latter in having their elytra wider, less shiny, more alutaceous, and with more finely punctate
striae, and the pronotum relatively larger, with a less smooth surface, and with the greatest pronotal
width more anterior. The type series of P.pusillus originally consisted of ten syntypes, seven of
which are in the Jeannel Collection in MNHN, each with a “Type” label. Among these, six specimens
match Jeannel’s description of P.pusillus very closely. The seventh specimen, a male, instead
may be a member of our new species, P.pusilloides. Consequently, in order to properly establish
the identity to P.pusillus, we here designate a lectotype as follows: a male, in MNHN, labeled:
“Hoa Binh, Tonkin”/ “Perileptus pusillus Jeannel, lectotype, design. 2016, ex coll. R. Jeannel, in
coll. MNHN, Paris”. The remaining six MNHN syntypes are all paralectotypes of P. pusillus,
including the lone possible male of P.pusilloides, which we are not including in the type series of
the latter species.
HABITAT DISTRIBUTION.— Members of this species have been found in daytime on sandy flats,
in gravel and under stones along the open, unshaded banks of small to large streams running
through agricultural areas with subtropical crops at elevations ranging from 680 to 1105 m. Most
specimens were driven from their hiding places by splashing the banks with water from the stream.
At the collecting site in Longyang County (see below), members of this species were found syntopic
with members of Perileptus imaicus.
GEOGRAPHICAL DISTRIBUTION WITHIN THE GAOLIGONG SHAN.— Fig. 6c. we examined a total
of 5 specimens (3 males and 2 females) from low elevations on both western and eastern slopes of
the southern part of the Gaoligong Shan in Tengchong and Longyang Counties, (see Type material
above for exact collection data), which are in Core Areas 6 and 7, respectively.
OVERALL GEOGRAPHICAL DISTRIBUTION.— This species currently is known only from the
southern part of the Gaoligong Shan region in western Yunnan Province, China.
Genus Agonotrechus Jeannel, 1923
Agonotrechus Jeannel, 1923:428.
Paragonotrechus Uéno, 1981:2.
Bhutanotrechus Uéno, 1977:188.
TYPE SPECIES.— Trechus birmanicus Bates, 1892.
DIAGNOSIS.— Adults of this genus (Figs. 7a–9a) can be recognized by the following combination
of character states: size medium to large for a trechine (BL = 4.5 to 7.0 mm) members of
most species with full hindwings and large, convex eyes, but those of a few species apterous and
with eyes reduced in size and/or convexity, some even microphthalmous or nearly anophthalmous;
frons flattened, depressed; dorsolateral margin of mandibular scope with a row of small setae
aligned as a sparse comb in some members (Belousov & Kabak 2003); right mandible (Fig. 16a)
bidentate, the premolar tooth fused with the retinaculum, from which the anterior tooth is distinctly
projected and in a forward position and the posterior tooth is absent or flush; left mandible with
only a short, subconical, more or less trifid ridge; clypeus with six setae in most members; labium
with anterior margin not or only slightly concave; mentum fused with submentum, incompletely in
some members; submentum with six setae in most members, but some with eight setae; pronotum
little narrowed basally, with lateral explanation distinctly broadened basally in many members; elytra
with discal striae varied, from complete to effaced, punctate in many members, parascutellar
striole very long in many members; anterior discal seta present in all members and inserted at the