Nebrioporus millingeni ( Balfour-Browne, 1951 )

Toledo, Mario, 2009, Revision in part of the genus Nebrioporus Régimbart, 1906, with emphasis on the N. laeviventris-group (Coleoptera: Dytiscidae), Zootaxa 2040, pp. 1-111 : 37-38

Nebrioporus millingeni ( Balfour-Browne, 1951)

Fig. 26

Potamonectes millingeni J. Balfour-Browne (1951:188) (orig. descr.); Brancucci (1980: 106).

Nebrioporus (s. str.) millingeni (J. Balfour-Browne) : Nilsson & Angus (1992: 28); Nilsson (2001: 172; 2003: 66).

Type locality. Yemen .

Type material. Holotype ♂ ( BMNH) "type [ BMNH circular, red bordered label] \ Arabia Yemen \ Millingen \ Fry coll. 1905-100 \ 44025 \ Deronectes millingeni D. S. Propos \ Potamonectes millingeni Type! J. Balfour-Browne det." Plus BMNH circular, red bordered " holotype " label add by me . Paratypes ( BMNH) : 1 ♂ and 2 ♀♀, same data as holotype except for: "cotype"[ BMNH circular, yellow bordered label] / " Potamonectes millingeni paratype J. Balfour-Browne det.

Additional material examined. Yemen: A. R. 10 km N of Hajah, Wadi Shares , 2150 m, 15°44’ N 43°36’E, M. M. Al – Safadi, 7-28.XII.1988 (4 exs. BMNH) .

Description. TL 5.5–5.9 mm; MW 2.7–3.0 mm. Rounded-oval, rather convex. Angle between pronotum and elytra visible or poorly marked. Colouration yellow or reddish-yellow, with widely extended dark pattern on head, pronotum and elytra.

Head brownish with a paler central spot on vertex. Antennae testaceous, with articles 7–11 darkened apically. Mouthparts reddish. Last article of maxillary palpi blackish.

Pronotum wide, with maximum width near the base. Base of pronotum often a bit wider than elytra. Lateral sides more or less regularly rounded, bordered. Posterior angles rounded. Dorsal surface rough due to the presence of a dense and impressed punctuation together with larger punctures, scattered and strongly impressed, concentrated mostly on anterior and posterior borders; surface covered by longitudinal wrinkles.

Elytra oval. Maximum width just behind the middle of the length. Sides poorly rounded in basal half. Longitudinal rows of punctures visible, except for the lateral rows which are often obsolete. Subapical denticle poorly developed but visible.

Dorsal colouration as in Fig 26a, with pronotum mostly dark, paler on the disc and lateral sides and elytra with wide longitudinal dark lines, often fused together with 2 - 3 lateral maculae.

Underside dull, due to the impressed and deep punctuation. Colouration black, prosternal process, metacoxal process, prothoracic pleura and proepisterna reddish. Epipleuron testaceous.

Pro and mesothoracic legs reddish-yellow, with darkened tarsi. Metathoracic legs completely pitch-black.

Male: Protarsi widened. Anterior claws ( Fig. 26b) long and unequal: the inner straight and robust, a little more than twice of the length of of 5th protarsomere. Outer claw about half of the length of the inner, more slender and sinuate. Mesotarsal claws subequal, long and sharp. Median lobe of aedeagus and parameres as in Fig. 26c,d.

Female: Externally similar to male.

Distribution ( Fig. 56). Yemen.