Idister (Idister) morphon Marseul, 1880: 154; Ohara & Mazur, 2000.
Idister morphon Marseul, 1880: 154.
Platysoma morphon: Bickhardt, 1910: 26.
Idister (Idister) morphon: Mazur, 1997: 83.
Idister modigliani Schmidt, 1894: 54, synonymized by Mazur, 1997: 83.
Platysoma modigliani: Bickhardt, 1910: 26.
Idister mendax Lewis, 1906: 184, synonymized by Mazur, 1997: 83.
Platysoma mendax: Bickhardt, 1910: 26.
Redescription (Ohara & Mazur, 2000).
Body oval, rather convex, dark reddish brown and shining; mouth parts, antennae, tibiae and tarsi light reddish brown. Body length, 1 male and 2 females: PPL, M 4.46, F 4.785.3; PEL, M 4.13, F 4.134.45; APW, M 1.32, F1.291.35; PPW, M 2.90, F 2.943.05; PL, M 1.52, F 1.421.5; EL, M 2.52, F 2.452.7; EW, M 3.33, F 3.333.55; ProL, M 0.39, F 0.360.4; ProW, M 1.67, F 1.741.8; PyL, M 0.84, F 0.951.03; PTL, M 1.03, F 0.941.1; MSTL, M 1.07, F 1.031.15; MTTL, M 1.35, F 1.231.35.
Antennal club (Fig. 4B) with V- shaped sutures, which are complete, without interruption. Ratio in width of pronotum to head about 2.68. Front of head flat. Frontal stria sinuate anteriorly and interrupted at middle and absent laterally. Disc of head evenly covered with microscopic punctures. Labrum transverse, the anterior margin feebly emarginate in male and straight with a small tubercle in female. One denticle present on inner margin of mandible.
Pronotum (Fig. 4C) feebly convex; the anterior margin broadly and regularly emarginate; marginal stria present on apical fourth of lateral margin, the apical portion curved inwardly and extending shortly; outer lateral stria complete laterally and anteriorly, the lateral portion incised at a distance from the margin; surface evenly covered with microscopic punctures that are separated by three to four times their diameter. Antescutellar area with a coarse puncture.
Epipleura with marginal stria on basal half. Elytral marginal stria feebly excavated on apical two-thirds. Subhumeral striae absent. Oblique humeral stria (Fig. 4C) slightly impressed on basal third. First dorsal stria deeply incised and complete; 2nd shortened on basal seventh; 3rd represented slightly on basal third, the basal end attaining to the anterior margin of elytron; 4th, 5th and sutural striae absent. Punctation of elytra similar to that of pronotum.
Propygidium (Fig. 4C) smooth, only finely punctate on latero-basal area. Pygidium densely covered with large and round punctures that are separated by about their own diameter, the punctures becoming finer medially; lateral margin thickly elevated and finely punctate.
Marginal stria of prosternal lobe (Fig. 4D) absent; surface of lobe densely covered with fine punctures. Prosternal process with complete carinal striae, the striae paralleled on anterior half and divergent on posterior half; the anterior ends of striae curved and united with each other to form an arc; posterior margin of process angulated. Two lateral prosternal striae present.
Anterior margin of mesosternum (Fig. 4D) emarginate; marginal stria complete and its outer edge subcariniform. Meso-metasternal suture straight, slightly impressed. Lateral metasternal stria extending obliquely, the outer edge strongly cariniform, the apical end attaining nearly to metacoxa. Post-mesocoxal stria absent. Intercoxal disc of metasternum smooth, evenly covered with microscopic punctures. Lateral disc with several large, round and shallow punctures on basal half.
Intercoxal disc of 1st abdominal sternum (Fig. 4D) with punctation similar to that of metasternum; lateral stria complete.
Protibia with 11 spines on latero-apical outer margin and 5 spines on inside of apical outer angle, the basal 4 on outer margin sparsely arranged. Mesocoxa without carinae. Meso- and metatibiae with two carinae on latero-apical margin, the carinae furnished with many spines; ventral surface with spiny row. Ventral surface of profemur covered with transverse rugae. Surface of mesocoxa without carina.
Male genitalia (Fig. 5). Eighth sternum with a large angulation on each lateral side. Ninth tergite strongly sclerotized and with two antero-lateral projections. Ratio in length of parameres to basal piece 5.33; basal piece rather short. Lateral side of parameres parallel, then strongly convergent on apical eighth; parameres fused on dorsal surface, but separated on apical third. Median lobe simple.
Female genitalia (Fig. 4I, J). Spermatheca oval and not sclerotized.
Specimens examined. Indonesia. Sumatra: Type, female, Hister morpho, 76 (round label), Sumatra, Sungei-bubu sett, 1878, O. Beccari, Idister morphon Mars., Type !, Museum Paris, coll. De Marseul, 2842-90, Type (MNHN); 1 male, Brastagi, G. Sibayak, 1450-1900 m, 1923-II-1991, Bocak & Bocakova (SMC). Malaysia. Borneo: 1 female, Sabah, Sipitang, Mendolong, S. Adebratt (SMC).
Distribution. Indonesia (Sumatra); Malaysia (Boreno). New to Borneo
Is.
Fig. 4. Idister (Idister) morphon. A: Head. B: Antenna. C: Adult, dorsal view. D: Ditto, ventral view. E: Left protibia, dorsal view. F: Ditto, ventral view. G: Left mesotibia, ventral view. H: Left metatibia, ventral view. I: Female genitalia, ventral view. J: Spermatheca. (Ohara & Mazur, 2000).
Fig. 5. Idister (Idister) morphon. A: Aedeagus, dorsal view. B: Ditto, lateral view. C: Genital segments: 8th, 9th and 10th tergites, 8th sternum and spicule, dorsal view. D: ditto, lateral view. E: Ditto, caudal view. (Ohara & Mazur, 2000).