Pycnoscelus striatus ( Kirby, 1903 )

Anisyutkin, Leonid N., 2018, New data on the genus Pycnoscelus Scudder, 1862 with the description of P. schwendingeri sp. nov. (Blaberidae: Pycnoscelinae), Revue suisse de Zoologie 125 (1), pp. 79-86 : 83

Pycnoscelus striatus ( Kirby, 1903)

Figs 8-11 , 27-38

Material examined: MHNG, without accession number; 1 male (genital complex in prep. 110817/02) and 18 larvae; W. Malaysia, N. of Kuala-Lumpur, Batu Caves; November 1976; collector unknown, probably Dr Brigitte Köpchen .

Description: On the basis of the newly examined male specimen the description of Roth (1998) can be supplemented with the following details.

Somatic characters of male: General colour yellowish brown ( Figs 8-11 ), pronotum and facial part of head darker; eyes black. Surfaces smooth and lustrous, antennae with lustrous proximal 6-7 segments, remaining segments dull; pronotum and tegmina, mostly in proximal half, with distinct punctuation. Head as in Figs 9 , 27 , slightly longer than wide, with transverse impression between antennal sockets; ocellar spots small but distinct; distance between eyes about equal to eye length; distance between antennal sockets about 2.5 times scape length (~ 0.6 mm); approximate length ratio of 3rd-5th segments of maxillary palps 1.3: 1.0: 1.3. Pronotum as in Figs 8 , 28 . Tegmina and hind wings distinctly abbreviate, not reaching abdominal apex. Fore tibiae distinctly thickened distally ( Fig. 29 ). Anterior margin of fore femora of armed type C, with single apical spine ( Fig. 29 ). Tibial spines well developed. Structure of hind tarsus similar to that of P. schwendingeri sp. nov., but metatarsus slightly longer than other segments combined, distally bordered with pair of “additional spines”; 2nd and 3rd tarsal segments with “additional spines” on their outside; arolium distinct, smaller than one half of claw length. Fore and mid tarsi similar to hind tarsi, but segments comparatively shorter. Abdomen without visible glandular specializations; tergite VIII with distinct spiracle-bearing outgrowths ( Figs 10-11 , 30 ) and large medial membranous area; sternite VIII large, plate-like. Anal plate (tergite X) weakly sclerotized, very weakly asymmetrical ( Figs 10 , 30 ). Cerci short, with distinct segments ( Figs 10 , 30 ). Paraprocts of blaberi-type, similar to those of P. schwendingeri sp. nov. Hypandrium asymmetrical, irregularly sclerotized ( Figs 11 , 31-32 ), with caudal margin convex, hook at posterolateral angle well sclerotized ( Fig. 32 , h.); left stylus absent, right one in shape of wide plate.

Male genitalia ( Figs 33-38 ): Right phallomere (R + N): caudal part of sclerite R1T well sclerotized, widely rounded ( Fig. 33 , c.p.R 1T ); bristles absent; R1T nearly straight; R2 weakly curved; R3 elongated, similar to that of P. schwendingeri sp. nov.; R4 plate-like, not fused with other sclerites; R5 elongated. Sclerite L2D (L1) divided into basal and apical parts ( Fig. 35 ); basal part robust ( Fig. 35 , b.L 2D ); “apical sclerite” with recumbent bristles ( Figs 34-35 , ap. scl.); “dorsal outgrowth” weak ( Figs 34-35 , d.o.). Sclerite L3 (L2d) with basal subsclerite ( Figs 36-38 , b.L 3 ); “folded structure” present, without bristles ( Figs 36-38 , f.s.); apex of L3 with “small tooth” ( Figs 36-38 , s.t.); groove hge absent. Sclerite L4U (L3d) divided into two parts ( Fig. 36 ).

Measurements (in mm): Head length 3.4, head width 3.2; pronotum length 5.0, pronotum width 6.5; tegmen length 10.9, tegmen width 5.0.

Figures

Figs 6-11. Photos of males of Pycnoscelus schwendingeri sp. nov. (6-7: holotype) and P. striatus (Kirby, 1903) (8-11: specimen from Batu Caves). (6, 8) General view from above. (7, 9) General view from below. (10) Abdominal apex, dorsal view. (11) Same, ventral view. Stylus in Figs 10-11 in everted state. Scale bars 10 mm: a: 6, b: 8. Other photos not to scale.

Figs 27-38. Pycnoscelus striatus (Kirby, 1903), male from Batu Caves. (27) Facial part of head. (28) Pronotum, dorsal view. (29) Right fore leg seen from anterior (below). (30) Abdominal apex, dorsal view. (31) Hypandrium, ventral view. (32) Caudal part of hypandrium, dorsal view. (33) Right phallomere, dorsal view. (34) Caudal part of sclerite L2D, lateral view. (35) Sclerite L2D, dorsal view. (36) Sclerites L3 and L4U, dorsal view. (37-38) Apex of sclerite L3. Dotted areas show membranous parts.Abbreviations: ap.scl., b.L2D, b.L3, c.p.R1T, d.o., f.s., h., L4U, par., R2, R3, R4, R5, s.t. - see paragraph “abbreviation used in figures”; VIII, IX, X - abdominal tergites VIII-X; for details see text. Scale bars 1 mm: a: 27, b: 28, c: 29, d: 30, 32, e: 31, f: 33, g: 34-35, 37-38, h: 36.

Figs 1-5. Pycnoscelus surinamensis (Linnaeus, 1758), female. (1) Abdominal apex, dorsal view. (2) Genital plate, ventral view. (3) Ovipositor and adjacent structures, ventral view.(4) Ovipositor, ventral view.(5) Basal part of ovipositor, dorsal view. Dotted areas show membranous parts, except for valves of ovipositor in Figs 3-4. Abbreviations: aa., bsv., Cer., gg., par., pl., teVIII., teIX., v.I., v.II., v.III., vs. - see paragraph “abbreviation used in figures”; VIII, IX, X - abdominal tergites VIII-X; for details see text. Scale bars 1 mm: a: 1, b: 2, c: 3, d: 4-5.