Chlaenius (Epomis) nigricans Wiedemann, 1821

Ullah, Mishkat, Naeem, Muhammad, Mahmood, Khalid & Garner, Beulah, 2022, Addition to the knowledge of Tribe Chlaeniini Brullé, 1834 (Coleoptera: Carabidae) from Pakistan, Zootaxa 5115 (4), pp. 451-486 : 468

Chlaenius (Epomis) nigricans Wiedemann, 1821

( Fig. 6a )

Chlaenius nigricans Wiedemann, 1821: 110 ; Epomis rugicollis LaFerté-Sénectère, 1851: 253 ; Chlaenius culminatus Bates, 1873: 251 .

Material examined. PAKISTAN • 1 ♀; Khyber Pakhtunkhwa, Swat, Charbagh ; 31.Aug.–02 Sep. 2015; Mishkat leg.; pitfall traps; PMNH • 5 ♂, 4 ♀; Islamabad, PMNH ; 29 Apr. 2014; Mishkat leg.; pitfall traps; PMNH • 1 ♂; same collection data as for preceding; 16 Apr. 2014; Mishkat leg.; PMNH • 3 ♂; same collection data as per preceding; 02 May 2014; Mishkat leg.; PMNH • 1 ♂; Islamabad, NARC ; 28 Apr. 2014; Mishkat leg.; pitfall trap; PMNH • 1 ♂, 1 ♀; Islamabad, Rawaldam , 28 Mar. 2015; Mishkatullah leg.; PMNH • 1 ♀; Islamabad, Trail No. 6, Faisal Mosque ; 18 Apr. 2015; Mishkat leg.; PMNH • 1 ♂; Islamabad, Margalla Town ; 25 Apr. 2015; Mishkat Ullah leg.; PMNH • 1 ♂; Islamabad ; 07 Dec. 1982; PMNH • 1 ♂ (1 specimen sex=?); same collection data as for preceding; 28 Nov. 1982; PMNH • 1 ♂; Islamabad, Sector D-16; 19 Apr. 2015; Mishkat leg.; PMNH .

Measurements. Male (n=10): TL= 19.68 mm, HW= 3.58 mm, PL= 4.17 mm, PW= 4.70 mm, EL= 11.97 mm, EW= 3.53 mm. Ratios PL/PW= 0.84, HW/PW= 0.72 and EL/EW= 3.43. Female (n=10): TL= 20.87 mm, HW= 3.63 mm, PL= 4.37 mm, PW= 5.08 mm, EL= 12.74 mm, EW= 4.08 mm. Ratios PL/PW= 0.86, HW/PW= 0.71 and EL/EW= 3.12

Diagnosis. Head and pronotun black with metallic green to pinkish copper tinge. Mandibles black to brown; antennal articles I–IX, palpi terminal articles, labrum and tarsus reddish brown; rest of the legs, palpi and entire interval IX yellowish brown. Clypeus smooth sparsely covered with minute punctures, frons, vertex and neck rugose and moderately to densely covered with deep setiferous punctures. Pronotum, antero-lateral angles blunt and posterolateral angles obtuse; apical margin sparsely covered with deep setiferous punctures becoming dense towards basal margin, latero-basal fovae deep and widening towards basal border; lateral bead black. Elytra black with greenish tinge towards base, entire interval IX yellow brown. Striae deep and punctate; intervals convex and raised, densely covered with setiferous punctures. Microsculpture isodiametrical. Venter densely punctate and pubescent.

Comments. Ch. (E.) nigricans is similar to Chlaenius (Epomis) duvaucelii ( Dejean, 1831) in general habitus. Ch. (E.) nigricans head and pronotum black with metallic green coppery tinge; elytra black with metallic green tinge at base and lateral margin, intervals convex laterally with wide deep setiferous punctures/fovae and middle mostly smooth, interval VIII & IX densely setiferous punctate. While, Ch. (E.) duvacelii head, pronotum and elytra cyan green; elytra slightly convex at base and flat towards apex, intervals entirely densely punctate. This species was also reported by Khatri et al. (2016) from Panjgor-Balochistan in the southern part of Pakistan. It is widespread from Pakistan to Japan. In this current study, it was collected from Swat and Islamabad.

Distribution. China, Japan, North Korea, South Korea (Anichtchenko 2017) and Pakistan ( Khatri et al. 2016).

Figures

FIGURE 6. Dorsal habitus (a) Chlaenius (Epomis) nigricans Wiedemann, 1821; (b) Chlaenius (Lissauchenius) rufifemoratus rayotus Bates, 1891 imaged from NHMUK collection; (c) Chlaenius (Lissauchenius) variipes Chaudoir, 1856 imaged from NHMUK collection; (d) Chlaenius (Lithochlaenius) agilis Chaudoir, 1856.