Uracanthus parvus Lea, 1916

Thongphak, Duangrat & Wang, Qiao, 2007, Taxonomic revision of the longicorn beetle genus Uracanthus Hope 1833 (Coleoptera: Cerambycidae: Cerambycinae: Uracanthini) from Australia., Zootaxa 1569 (1569), pp. 1-139 : 59-60

Uracanthus parvus Lea, 1916

(Figs 49, 87, 109)

Uracanthus parvus Lea, 1916: 375 .– McKeown, 1947: 65.

Uracanthus dentiapicalis McKeown, 1948:54 . syn. nov.

Description

Male. Body length, 11.9–20.4 mm; width, 1.71–2.93 mm.

Colour (Fig. 49). Head, thorax, antennae, and basal elytra blackish brown; the remaining part reddish brown. Body covered with sparse to fairly dense white or yellowish pubescence; elytra with denser and longer whitish pubescence on base along suture and from basal 1/10 to 1/3 near margin. Antennal segments 4 to 10 with dense fringe of yellowish pubescence on one side. Body colour varies from blackish brown to reddish brown.

Head. Postclypeus semicircular, convex, smooth and shiny; frontoclypeal suture deep and narrow in middle; distance between lower lobes of eyes 1.37–1.75 × as long as distance between upper lobes of eyes; distance between upper lobes of eyes 1.5–1.67 × as long as distance between eyes on ventral side; genal length 0.35–0.38 × as long as head width immediately below eyes. Antennae slightly longer than body; segments 4– 10 slightly flattened and strongly produced on one side at apex.

Thorax and abdomen. Pronotum 1.25–1.41 × as long as width, rounded at side; posterior margin 1.23– 1.44 × as wide as anterior margin; pronotal disc very weakly binodulose in middle area; disc and side strongly rugose transversely. Scutellum semicircular, with sparse pubescence. Elytra 4.94–5.30 × as long as prothorax and 4.2–4.65 × as long as shoulder width; basal 1/3 of elytra coarsely punctate and then 2/3 of elytra finely punctate, gradually diminishing toward to apex; apex bispinose. The apical spines of the elytra may vary from highly developed to small processes. Apex of terminal sternite truncate or slightly emarginate.

Male terminalia. Apex of ventral median lobe rounded and apex of dorsal lobe narrowly rounded or slightly pointed; dorsal lobe shorter than ventral lobe. Spined region of internal sac divided into two sections: first section longer than unspined gap and second section combined, with fairly dense multi-branched spines on basal 2/3 and some scale-like spines on apical 1/3; second section with sparse short simple spines ( Fig. 87a). Eighth sternite rounded or slightly obliquely truncate at side, almost truncate at apex, with fairly long setae arising terminally; ventral surface with cloud-like processes ( Fig. 87b). Eighth tergite truncate and shallowly emarginate at apex; surface with fairly dense basally-forked spines and simple spines ( Fig. 87c). Paramere robust, 2.0–2.09 × as long as wide, apex obliquely truncate with fairly dense long and short setae ( Fig. 87d).

Female. Body length, 11.21–18.33 mm; width, 1.87–2.80 mm.

Body more robust; pubescence on elytra more or less evenly distributed; antennae shorter than body, without fringe.

Ovipositor and spermatheca. Ovipositor relatively long; styli long, arising terminally with short and long hairs ( Fig. 87e). Spermatheca curved, particularly near apex; spermathecal gland relatively long, arising at base ( Fig. 87f).

Distribution

Southern, southwestern and northeastern Western Australia, southern and northern Northern Territory, northern and southern South Australia, and southwestern New South Wales ( Fig. 109).

Biology

Hosts are unknown. Adults were collected from October to March, and in May and August by UV light and pitfall.

Comments

This species closely resembles U. pertenuis but differs in having the body more slender, male elytra with denser and longer whitish pubescence along the suture and margin, while female elytra have pubescence more or less evenly distributed, and the elytral apex with two small spines of similar size or length.

Material examined

Uracanthus parvus . Holotype. ♂. WA: no locality, Coll. no. I. 5703, W. du Boulay ( SAM).

Uracanthus dentiapicalis . Holotype. ♂. WA: Wandagee Station (23°50'S, 114°30'E), Coll. no. 41-740 ( WAM).

Other material examined: 31 ♂, 6 ♀. NT: 1 ♂, 26 km WSW of Mulga Park (26º00'S, 131º25'E) HS, 18.i.1982, D. C. F. & B. G. F. Rentz, & R. Honeycutt ( ANIC) ; 1 ♂, Rimbija (11º01'S, 136º45'E), Wessel Island, 21.i–3.ii.1977, Farrow & Dowse ( ANIC) ; 1 ♂, same data as above but no abdomen ( ANIC) ; 1 ♂, Finke Gorge National Park , 4 km N Finke Ellery Ck, JCL, 26.iii.1993, J. A. Forrest & D. Hirst ( SAM) ; 1 ♀, Yuendumu , Central Australia ( QM) . NSW: 5 ♂, 11 km N of Mossgiel (33º16'S, 144º34'E), Willandra Bridge, dry swamp, 21.xii.1970, at light, Britton, Misko & Pullen ( ANIC) . SA: 1 ♂, Mt. Davies (26º12'S, 129º15'E), 11.xi.1963, at light, P. Aitken & N. B. Tindale ( SAM) ; 1 ♂, Minnie Downs, N.E. Corner of SA, L. Reese ( SAM) ; 1 ♂, Everard Park (27º00'S, 132º42'E), 30.x.1970, at light, E. Matthews ( SAM) ; 1 ♂, same data as above but 2.xi.1970 ( SAM) ; 2 ♂, 48.9 km SE Mt. Lindsay (27º18'50″S, 130º15'54″E), Sand plain PIL camp, 22–25.x.1996, pitfall, Pitjantjatjara Lands ( SAM) ; 1 ♂, 6 mile W of Iron Knob (32º43'S 137º49'E), 16.iii.1968, I. F. B. Common & M. S. Upton ( ANIC) ; 1 ♀, 40 km W Vokes Hill Junct , (28º32'S, 130º16'E), 14–15.iv.1994, Malaise trap, J. A. Forrest ( SAM) ; 1 ♂, Margaret Rv. 9.5 km SE Coward Spring. 2.xii.1974, at light, J. A. Her- ridge ( SAM) ; 1 ♂, Frome River crossing of Birdsville Track nr Marree, 25.x.1966, G. F. Gross ( ANIC) . WA: 2 ♂, Milly Milly (26º04'S, 116º41'E), 27.v.1922 ( WAM) ; 1 ♀, 3.75 km NE of Comet Vale Siding (29º57'S, 121º07'E), 7–15.iii.1979, T. F. Houston et. al. ( WAM) ; 1 ♂, 29 km SE by E of Coolgardie (31º07'S, 121º24'E), 5.v.1983, E. S. Nielson & E. D. Edwards ( ANIC) ; 1 ♂, Carson Escarpment (14º49'S, 126º49'E), 9– 15.viii.1975, no abdomen, I. F. B. Common & M. S. Upton ( ANIC) ; 1 ♂, Yanchep NP (31º32'S, 115º41'E), 28.iii.1990, Horak Wooks, Walsh & Yeates ( ANIC) ; 1 ♂, 10 km W by SW of point Malcolm (33º48'S, 123º46'E), 15–18.i.1982, at light, B. Hanich & T. F. Houston ( WAM) ; 1 ♂, 1 ♀, Bernier Island , 18.v.1963, R. D. Hughes ( ANIC) ; 1 ♂, Drysdale River (15°02'S, 126°55'E), 3–8.viii.1975, I. F. B. Common & M. S. Upton ( ANIC) ; 1 ♂, Kalgoorlie , iii.1845, Mathews ( WADA) ; 1 ♂, 16km W of Lyons River HS (24º38'S, 115º20'E), 13–15.v.1981, B. Hanich & T. F. Houston ( WAM) ; 1 ♂, 11 km N of Geraldton, at Drummond Cove , 2– 11.v.1973, UV light, N. McFarland ( ANIC) ; 1 ♂, 9 km NW of Mt Ragged, Junana Rock (33º23'S, 123º24'E),, 26.x.1977, J. F. Lawrence ( ANIC) ; 1 ♀, 1.7–2.7 Km NW of Toolinna Rockhole (32º45'S, 124º59'E), 24– 28.ii.1984, on Colluvium swale-stunted grass, T. F. Houston ( ANIC) ; 1 ♂, 1 ♀, Wittenoom (22º14'S, 118º20'E) ( WAM) .