Macroscytus piceus
Creators: name: Lis, J. A.
Publisher: name: Zenodo
Year: 2000
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Cydnidae
Macroscytus
Macroscytus piceus

description: Macroscytus piceus (WESTWOOD)
(Figs 251­257)
Cydnus piceus WESTWOOD, 1837: 5 [name only], 18.
Cydnus dilatatus SIGNORET, 1881: 631; LETHIERRY & SEVERIN 1893: 66 (syn. by LIS 1999a: 476).
Acatalectus piceus: DALLAS 1851: 123; DOHRN 1859: 9; WALKER 1867: 165.
Adrisa picea: STÃL 1876: 20; LETHIERRY & SEVERIN 1893: 63; DISTANT 1900: 820.
Macroscytus dilatatus: LIS 1995b: 144.
Macroscytus piceus: LIS 1995b: 145, 1999a: 476.
DESCRIPTION
Body 6.08­8.75 mm in length, 3.68­5.32 mm in width, from castaneous to black, posterior margin of pronotum sometimes slightly lighter in shade.
Head dorsally striated and wrinkled, at first glance looking impunctate, but bearing numerous hardly visible punctures; clypeus subapically without a pair of setigerous punctures, each paraclypeus submarginally with 4­10 (usually 6­9) setigerous punctures bearing long hair­like setae (Fig. 252); ocular index 2.38­ 2.90; interocellar index 4.0­7.0; length of antennal segments (in mm): 0.26­0.45: 0.37­0.57: 0.34­0.62: 0.37­0.46: 0.40­0.50.
Puncturation of pronotal disc well developed, punctures coarse and large, better visible behind calli; transverse discal impression behind calli absent or very shallow; lateral margins of pronotum with 10­15 submarginal setigerous punctures bearing long hair­like setae (Fig. 251). Anterior convexity of propleuron alutaceous, its anterior half distinctly punctate; posterior convexity with a few large punctures close to propleural depression, the latter densely and coarsely punctate.
Scutellar disc with large crowded punctures, except basal fourth and extreme apex.
Mesocorial disc densely and evenly punctate; exocorium densely punctate; costa broad, flat, separated from exocorium in its basal two thirds, and bearing 7­ 13 setigerous punctures (Fig. 251).
Male hind femora with a few more or less visible denticles, subapical teeth absent (Fig. 253); male hind tibia with large subbasal tooth (Fig. 253); female hind tibia and femur simple.
Abdominal sterna alutaceous, more or less polished, each segmental suture accompanied by a row of punctures, median parts of sterna impunctate, lateral thirds with numerous large punctures.
Male genitalia as in Figs 254­257.
TYPE DATA
Lectotype female of Cydnus piceus WESTWOOD (designated by LIS 1995b: 145): N[ova] H[ollandia] (OXUM). Lectotype male of Cydnus dilatatus SIGNORET (designated by LIS 1995b: 144): Australia, Somerset (NHMW).
MATERIAL EXAMINED
Lectotype of Cydnus piceus, Lectotype of Cydnus dilatatus, and 140 other specimens: Australia: Western Australia, Yanchep, 32m. N. of Perth, 1 ex. (BMNH); Western Australia, Yardie Ck., Carnarvon, 3 exx. (NMV, UO); Western Australia, Carnarvon, 6 exx. (NMV, UO); Western Australia, Bungabiddy Rockhole, Walter James Ra., 3 exx. (WAM, UO); Western Australia, Irrunytju Rockhole, Hinckley Range, 3 exx. (WAM, UO); Western Australia, Mt Yokine, 2 exx. (NMV); Western Australia, 4 km SW Giles Creek, X­ring, Giles­Docker R Rd., 1 ex. (WAM); Western Australia, Nullagine, 1 ex. (WAM); Western Australia, Roebuck Bay, 1 ex. (BMNH); Western Australia, Enneaba, 1 ex. (WAM); Northern Territory, 2.8 mls S. of Renner Springs, 12 exx. (SAM, UO); Northern Territory, Kings Canyon, George Gill Range, 5 exx. (NTM, UO); Northern Territory, Junction of Arnhem Hwy & Oenpelli Road, 2 exx. (NTM); Northern Territory, South Attack Ck, 6 exx. (NTM, UO); Northern Territory, Attack Ck., 2 exx. (NTM); Northern Territory, Murgenella, 3 exx. (NTM, UO); Northern Territory, 1 km W of Baralili Ck, crossing on Arnhem Hwy nr Jabiru, 2 exx. (NTM); Northern Territory, White Range, Arltunga, 3 exx. (NTM, UO); Northern Territory, 1 km N of Barrow Creek, 1 ex. (NTM); Northern Territory, Groote, Eylandt, 1 ex. (NTM); Northern Territory, Groote, Eylandt, 1 ex. (BMNH); Northern Territory, Kakadu NP., c. 1 km S of Arnhem Hwy on Pine Creek Rd., 1 ex. (NTM); Northern Territory, Corndorl billabong nr Jabiru, 1 ex. (NTM); Northern Territory, 9 km N by E of Mudginberri, 4 exx. (NTM, UO); Northern Territory, Swim Ck., Crossing Point Stuart Stn., 1 ex. (NTM); Northern Territory, Koongara, 15 km E of Mt. Cahill, 2 exx. (NTM); Northern Territory, Cooper Ck., 15 km S by W of Nimbuwah Rock, 1 ex. (NTM); Northern Territory, 1km N of Cahills Crossing, East Alligator R., 1 ex. (NTM); Northern Territory, Melville Island, Pularumpi, 4 exx. (NTM, UO); Northern Territory, Nourlangie Ck., 8 km N of Mt. Cahill, 1 ex. (NTM); Northern Territory, 4.6 km S of Renner Springs, 2 exx. (SAM); Northern Territory, Elliot, 3 exx. (NTM, UO); Northern Territory, Roderick Creek, Gregory N.P., 1 ex. (NTM); Northern Territory, Keep River NP., Gorge carpark, 1 ex. (NTM); Northern Territory, Ooraminna Rockhole, 50 km SSE Alice Springs, 1 ex. (NTM); Northern Territory, Green Ant Ck., 40ml. S of Adelaide River, 1 ex. (NTM); Northern Territory, Elsey Ck., 10ml. E of Mataranka on Roper Bar Rd., 1 ex. (NTM); South Australia, 22 km WN.V of Moralana HS, 2 exx. (SAM); South Australia, 10 km NW Maynards Well. Nthn Flinders Rgs., 2 exx. (SAM); South Australia, Flinders Rg., Brachina Gorge, 2 exx. (SAM); South Australia, Mudla Bore, 35 km NNE Billa Kalina HS, 3 exx. (SAM); South Australia, Coopers Creek, Ferry Crossing, 2 exx. (SAM); South Australia, Levi Crk., 8 km NW Big Perry Spring, 20 exx. (SAM, UO); South Australia, L. Torrens nr. Beda Hill. 2 exx. (SAM); South Australia, Mid E of L. Frome coast, Sandhills, Desert Oak., 3 exx. (SAM, UO); South Australia, 10 km ENE Stuart Crk. HS., 1 ex. (SAM); South Australia, Mt. Remarkable, 2 exx. (SAM); South Australia, Margaret R., 10 km SE Coward Springs, 1 ex. (SAM); South Australia, Ediacara, 1 ex. (SAM); Queensland, Telegraph Line Crossing, Jardine R., Cape York, 1 ex. (UQIC); Queensland, Bamaga, Cape York, 1 ex. (QMB); Queensland, Moreton Is., 1ex. (QMB).
DISTRIBUTION
Australia (incl. Tasmania), Indonesia (Sumba Island).
description: Published as part of Lis, J. A., 2000, A revision of the burrower-bug genus Macroscytus Fieber, 1860 (Hemiptera: Heteroptera: Cydnidae), pp. 359-509 in Genus (Wrocław) 11 (3) on pages 458-461