Laius marchei Pic, 1922

Figs 3E, 6B, 7E, 8E, 9E

Laius marchei Pic, 1922: 158 .

Rotamalachius esakii Kôno, 1937 in Kôno & Esaki 1937: 121 . Synonymised by Nakane (1955).

Laius marchei – Wittmer 1958: 72 [redescription]. — Satô et al. 2006: 344.

Material examined

56 ♂♂, 14 ♀♀ (EUMJ), “(MARIANA Is.) Teteto Beach Rota I. 22. Jan. 1980 M. Tomokuni ”; 1 ♀ (EUMJ), “ Is. Rota mariana VIII. 8. 1940 D. Matsusita ”, “ Laius marchei Pic det. W. Wittmer ”; 1 ♂ (EUMJ), “(Rota Tatochio) South Sea Islands of Nippon: 8-VIII. 1940 Coll. Dengo Matsusita ”; 2 ♂♂, 1 ♀ (BPBM), “Tumon Bay, Guam 24 June 1969 ”, “ A. A. LaPlante Collection BISHOP Museum Acc. #1977.84”.

Redescription

Male

HL/HW 0.71–0.93 (0.79); PW/PL 1.21–1.36 (1.28); EL/EW 1.28–1.48 (1.42); EL/PL 2.42–2.86 (2.68); EW/PW 1.41–1.58 (1.48); TL/EW 2.25–2.44 (2.36). Antennae (Fig. 7E) long; antennomere I long and curved laterally, with small projection in lateral margin; antennomere III (Fig. 8E) trapezoidal, deeply concave in dorso-mesal portion, L/W = 0.76; approximate ratio of each antennomeres (n = 1) as 11.8: 1.0: 7.0: 2.6: 2.0: 2.2: 2.2: 2.4: 2.4: 2.4: 3.8. Caudal margin of tergite VII concave. Aedeagus (Fig. 9E) about 1.28 mm, concave at aedeagal apex. Gonoporal piece (Fig. 3E) straight, slender, with long and straight basal projection, 0.80 mm in GL; GL/AL 1.91. Ligula (Fig. 3E) long and slender, strongly curved in apical half; LL 0.33 mm; LW 0.17 mm; LL/LW 2.81; GL/LL 2.44.

Female

HL/HW 0.72–0.87 (0.80); PW/PL 1.13–1.32 (1.24); EL/EW 1.43–1.55 (1.46); EL/PL 2.64–2.96 (2.82); EW/PW 1.52–1.67 (1.57); TL/EW 2.34–2.45 (2.38). Antennae (Fig. 7E) long; antennomere III short, L/W = 2.25; approximate ratio of each antennomeres (n = 1) as 9.4: 1.0: 5.0: 2.4: 2.8: 2.4: 2.4: 2.4: 2.4: 2.4: 4.0.

Measurements

Male (n = 15): TL 4.90–6.75 (5.36) mm; HL 0.80–1.40 (0.94) mm; HW 1.10–1.50 (1.19) mm; PW 1.35– 1.90 (1.53) mm; PL 1.10–1.50 (1.20) mm; EL 2.90–3.85 (3.21) mm; EW 2.10–3.00 (2.27) mm. Female (n = 6): TL 5.15–5.73 (5.37) mm; HL 0.85–1.00 (0.92) mm; HW 1.10–1.25 (1.15) mm; PW 1.35–1.50 (1.44) mm; PL 1.10–1.30 (1.17) mm; EL 3.15–3.43 (3.28) mm; EW 2.20–2.40 (2.25) mm.

Distribution

Mariana Isls. (Rota, Guam).

Remarks

This is the first record of this species from Guam, Mariana Islands.