Exochomoscirtes rufomaculatus Pic, 1916

Ruta, Rafał & Yoshitomi, Hiroyuki, 2010, Revision of the genus Exochomoscirtes Pic (Coleoptera: Scirtidae: Scirtinae) 2598, Zootaxa 2598 (1), pp. 1-80 : 25-26

Exochomoscirtes rufomaculatus Pic, 1916

Exochomoscirtes rufomaculatus Pic, 1916: 7

( Figs. 1A–C , 10G , 11D , 18 )

Type material. Holotype, female ( MNHN): “Jav / Wallace” [printed & handwritten label]; “ Exochomoscirtes / ng / rufomaculatus / Pic” [blue rectangular label, handwritten by Pic]; “type” [small yellow label, handwritten by Pic]; “ Scirtidae ” [handwritten label].

Diagnosis. Species with peculiar dorsal parttern consisting of four large orange maculae on elytra. Prehensor very long and thin.

Redescription. Holotype, female. Body hemispherical, TL/EW 1.2, very convex, covered with yellowish suberect setae. Dorsum blackish brown with two large oval orange maculae on each elytron, anterior maculae reaching base of elytra, suture, area surrounding maculae, and external elytral margin brownish-black, in effect a cruciform pattern; ventral side, legs, mouthparts and antennae lighter; epipleura darkened in external portion; antennae darkened apically.

Head covered with fine punctures, separated by ca. 1.0 diameter. Eyes big, moderately protuberant; head 1.8 X wider than interocular space. Antennae filiform, antennomere 1 subcylindrical, antennomere 2 subglobular, antennomere 3 elongate but narrow, antennomeres 4–9 slightly longer than antennomere 3; remaining antennomeres missing in the holotype.

Pronotum small, slightly convex, covered with fine punctation, similar to that on head, separated by ca. 1.0 diameter, anterolateral corners projecting anteriorly; lateral margins straight; posterolateral corners acute; base of pronotum subtrapezoidal, with complete margination along basal margin; PW/PL 3.2. Scutellum with fine punctation, equilaterally triangular. Angle between pronotum and elytra not marked in dorsal outline.

Elytra broadly oval, without traces of longitudinal ridges, with slightly explanate lateral margins, widest in the basal 1/3, punctation stronger than on pronotum, distance between punctures ca. 1.0–2.0 diameter of puncture; humeri well marked; EL/EW 1.1; EL/PL 5.1; EW/PW 1.5.

Legs moderately long. A pair of metatibial spurs present; the longer spur almost straight, almost as long as tarsomere 1, shorter spur straight, as long as 2/3 of the length of longer spur.

Ventrites 1 and 2 with sparse setation in mesal portions, ventrite 2 with basal row of big punctures. Apex of tergite 7 unmodified. Apex of ventrite 5 truncate.

Female genitalia. Prehensor very narrow and long (L 1.35), bursal sclerite indistinct.

Male unknown.

Measurements. Female (n = 1): TL 4.70, PW 2.70, PL 0.85, EW 4.10, EL 4.30.

Distribution. Java.

Figures

FIGURE 1. Morphological details of Exochomoscirtes. A) Exochomoscirtes rufomaculatus Pic, labium; B) Exochomoscirtes rufomaculatus Pic, maxilla; C) Exochomoscirtes rufomaculatus Pic, mandible; D) Exochomoscirtes picturatus sp. nov., meso- and metaventrite; E) Exochomoscirtes picturatus sp. nov., meso- and metaventrite, closeup; F) Exochomoscirtes maculatus (Waterhouse), wing; G) Exochomoscirtes dilaticornis sp. nov., wing.

FIGURE 10. Selected holotype labels. A) Exochomoscirtes bimaculatus Pic; B) E. binotatus Pic; C) E. decemguttatus (Champion); D) E. ephippiatus (Champion); E) E. maculatus (Bourgeois); F) E. maculatus (Waterhouse); G) E. rufomaculatus Pic; H) E. sphaericus (Champion); I) E. tetrastigma (Champion).

FIGURE 11. Habitus illustrations of Exochomoscirtes. A) E. bimaculatus Pic; B) E. basipunctatus sp. nov.; C) E. binotatus Pic; D) E. rufomaculatus Pic; E) E. ephippiatus (Champion); F)–I) E. picturatus sp. nov., color forms; J)–L) E. takizawai sp. nov., color forms; M) E. tetrastigma (Champion). Scale bar = 2.0 mm.

FIGURE 18. Exochomoscirtes rufomaculatus Pic, prehensor.