Perileptus imaicus Jeannel, 1923

Deuve, Thierry, Kavanaugh, David H. & Liang, Hongbin, 2016, Inventory of the Carabid Beetle Fauna of the Gaoligong Mountains, Western Yunnan Province, China: Species of the Tribe Trechini (Coleoptera: Caraboidea), with Descriptions of Four New Genera, One New Subgenus and 19 New Species., Proceedings of the California Academy of Sciences 63 (12), pp. 341-455 : 347-348

Perileptus imaicus Jeannel, 1923

( Figs. 5 , 35a , 45–48 )

Perileptus imaicus Jeannel 1923 . Lectotype, here designated, a male, in BMNH, labeled: “ Lectotype ” [red label];/ “ W. Almora, Kumoan U.P., India H.G.C.”/ P. imaicus Jeannel det.”/ “ H.E. Andrewes Coll., B.M. 1945-97.”/ “ Perileptus imaicus Jeannel , lectotype, Deuve & Kavanaugh des. 2016”. Type locality: India, Uttar Pradesh, Kumoan, West Almora. Paralectotypes (a total of 8), labeled same as lectotype, in BMNH and MNHN.

DIAGNOSIS.— Adults of this species ( Fig. 5a ) can be distinguished from those of all other species in the region by the following combination of character states: size small (BL = 2.6 to 2.8 mm), fully-winged; body color reddish with apical part of elytra darker; microsculpture of elytra effaced; dorsal pubescence sparse and long; pronotum slightly transverse (ratio PW/PL = 1.32), distinctly convex, with lateral margins markedly rounded in anterior half, straightened just anteri- or to basal angles, the latter acute and sharp and laterally projected, median basal area coarsely punctate; elytra shiny, moderately flattened, with striae coarsely punctate.

COMMENTS.— Perileptus denticollis Jeannel (1923) , known from the Dali region of Yunnan Province, is probably conspecific with P. imaicus because there appear to be no morphological features to distinguish members of these two nominal species. Members of Perileptus davidsoni Deuve (1989) , described from the Kathmandu area in Nepal, also are externally similar in form and structure to those of P. imaicus , but the apex of the median lobe of the aedeagus of males of P. davidsoni is more broadly rounded (more narrowly rounded in P. imaicus males ( Fig. 5b )).

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 and other disturbed areas at elevations ranging from 680 to 2030 m ( Fig. 35a ). 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 pusilloides sp. nov.

GEOGRAPHICAL DISTRIBUTION WITHIN THE GAOLIGONG SHAN.— Fig. 5c . We examined a total of 84 specimens (25 males and 59 females) from the following localities: Gongshan County: Bingzhongluo Township ( Xiao Shangla He at Shuangla Village , N27.97514° / E98.65502°, 1550 m, 9 October 2002, Stop # DHK-2002-043, D.H. Kavanaugh , H.B. Liang, & W.D. Ba collectors [2 males and 30 females; CAS, IOZ, MNHN]). Longyang County : Bawan Township (Kunhong He at Bingmen, N25.09065° / E98.83721°, 680 m, 22 May 2005, Stop # 2005-019, D.H. Kavanaugh & H.B. Liang collectors [12 males and 14 females; in CAS, IOZ)], 1 June 2005, Stop # 2005-039, D.H. Kavanaugh & H.B. Liang collectors [11 males and 11 females; CAS, IOZ]). Tengchong County : Jietou Township (0.75 km N of Dahetou Ligganjiao on Longtang He, N25.74622° / E98.69612°, 2030 m, 18 May 2006, Stop # DHK-2006-029, D.H. Kavanaugh , R.L. Brett, & H.B. Liang collectors [3 females; in CAS, IOZ]; stream 0.7 km N of Jietou, N25.43128° / E98.64773°, 1564 m, 22 May 2006, Stop # DHK-2006-036A, D.H. Kavanaugh & R.L. Brett collectors [1 female; CAS]). These localities are at low to middle elevations in Core Areas 2, 6 and 7 .

OVERALL GEOGRAPHICAL DISTRIBUTION.— Fig. 45 . This species currently is known from the Himalayan region of India from Himachal Pradesh to Darjeeling and Sikkim. It has also been reported from Yunnan under the name P. denticollis Jeannel (1923) (see Uéno 1996b)

Figures

FIGURE 5. Perileptus imaicus Jeannel; a. Dorsal habitus (CASENT1036287). b. Median lobe of aedeagus of male (CASENT10363020), left lateral aspect. c. Map of locality records (red circles) for P. imaicus in the Gaoligong Shan region. Scale lines a, b = 0.5 mm, c = 100 km.

FIGURE 35. Photographs of habitats for trechine species in the Gaoligong Shan region. a. Gongshan County, Bingzhongluo Township, Xiao Shangla He at Shuangla Village, elevation 1550 m; habitat in which specimens of Perileptus imaicus Jeannel were collected. b. Gongshan County, Qigi He, 9.9 airkm W of Cikai, elevation 2000 m; habitat in which specimens of Agonotrechus fugongensis sp. nov. were collected. Photos by David H. Kavanaugh.

FIGURE 45. Map showing approximate overall known geographical distributions of species occurring in the Gaoligong Shan region as well as outside the region. 1 = Peripleptus imaicus Jeannel. 2 = Agonotrechus wuyipeng Deuve. 3 = Eoc- nides fragilis Uéno. 4 = Trechus indicus Putzeys. Scale line = 500 km.

FIGURE 46. Chart showing the representation of trechine species in project-designated Core Areas (see Fig. 3) in the Gaoligong Shan region.

FIGURE 47. Chart illustrating the altitudinal ranges of trechine species represented in the Gaoligong Shan region.

FIGURE. 48. Chart illustrating the co-occurence (syntopy) of trechine species in samples from the same habitats and at the same sites in the Gaoligong Shan region.