Acrotrichis perexigua, Darby, Michael, 2014

Darby, Michael, 2014, Studies of Madagascan Ptiliidae (Coleoptera) 3: The genus Acrotrichis including twenty seven new species, Zootaxa 3866 (2), pp. 151-201 : 188

Acrotrichis perexigua sp. n.

( Figs. 27A –I)

Habitus Fig. 27A . Length 0.78 mm. Colour brownish black, antennae and legs brownish yellow. Antennomeres 3–11 0.33 mm long Fig. 27 C. Mentum and submentum chaetotaxy Fig. 27 I. Width across eyes 0.28 mm. Pronotum 0.42 mm wide, 0.23 mm long, sides with a slight short sinuation before the posterior angle Fig. 27 B. Elytra 0.44 mm long, 0.45 mm wide. Posterior margin of mesoventral collar slightly sloped at shoulders and without a medial excision Fig. 27 F. Posterior margin of metaventrum and metacoxal plates Fig. 27 H.

Male: ventrite six with +/- 8 fine spines Fig. 28 G; aedeagus Fig. 28 E.

Female: spermatheca Fig. 28 D.

Etymology. Johnson ms name.

Remarks. Only likely to be confused with minuscula and exigua but perexigua is a little more convex than these and all the other small species.

Type data. Holotype: ♀, Massif de l’Ankaratra, Col. de Manontongana, c. 2000 m, 14.iv.1969, upper limit of mountain forest, leg. H. Franz (MM). Paratypes: 2♂, Massif de l’Ankaratra, 12.iv.1969, mountain forest near forest station, leg. H. Franz (MM); 25 examples, Ranomafana N.P., S.21˚14’51” E.47˚24’13”, sifting, 1079 m, 16–18.xi.2010, P. Banar ( BMNH); 1♂, Ranomafana N.P., RNF/13.2011, sifting, Winkler app. extr., S 21˚15’13.5” E.47˚24’09.8”, 1158m, 16.iv.2011, L.S.Rhanitriniaina & R. Raveloson ( BMNH); 14 examples, Andasibe N.P., sifting leaf litter, Winkler app. extr., 2–5.v.2011, L.S.Rhanitriniaina ( BMNH); 1♀ Montagne d’Ambre N.P., sifting, 1100 m, 30.x.2010, P. Banar ( BMNH).

Figures

FIGURE 27. A. perexigua. A, habitus; B, side of pronotum viewed at 45 ˚; C, antennomeres 3 – 11; D, spermatheca; E, aedeagus; F, mesoventral collar x 625; G,`ventrite six; H, metaventral posterior margin and metacoxal plates x 595; I, mentum and submentum showing chaetotaxy.

FIGURE 28. A. perfida. A, habitus; B, side of pronotum viewed at 45 ˚; C, antennomeres 3 – 11; D, spermatheca; E, aedeagus; F, mesoventral collar x 740; G, metaventral posterior margin and metacoxal plates x 615; H, ventrite seven; I, mentum and submentum showing chaetotaxy.