Oecetis humphreyi, Wells, 2006

Wells, Alice, 2006, A review of Australian long-horned caddisflies in the Oecetis pechana-group (Trichoptera: Leptoceridae), with descriptions of thirteen new species, Memoirs of Museum Victoria 63 (2), pp. 107-128 : 116

Oecetis humphreyi sp. nov.

Figures 18–20, 62

Material examined. Holotype. Male, NT, Radon Springs, 13–14 Apr 1989, Suter and Wells ( NMV T-18841).

Paratypes. NT: 2 males, same data as for holotype ( NMV) ; 1 male, 12°48'S, 132°49'E, Kakadu National Park , Baroalba Springs, 25 Apr 1991, Wells and Webber ( NTM) ; 4 males, females, same locality and collectors, 29 May 1991 ( NTM) ; 2 males, same locality and collectors, 4 Oct 1991 ( NTM) ; 1 male, Berry Springs , edge of Melaleuca nr Billabong, 8–9 Apr 1991, Wells and Horak ( NTM) ; 1 male, Berry Springs , 4 Oct 1991, Wells ( NTM) .

Other material. NT: 3 males, 1 female, Butterfly Gorge , Katherine Gorge National Park, 27 Jan 1977, M.S. Moulds ( NMV) ; numerous males, females, ARR Magela Creek OSS site 009, 15 Feb 1991, A. Wells ( NMV) ; 2 males, ARR Magela Creek 009, 15 Mar 1991, Wells and Webber ( NTM) ; numerous males, females, 12°40'S, 132°53'E, Jabiru , Town Lake, 2 Apr 1991, Wells and Webber ( NTM) ; 1 male, 12°42'S, 132°57'E, Kakadu National Park , Magela Creek, at Rum Pipeline, 6–7 May 1991, P. Dostine ( NMV) ; 1 male, 1 female, Gregory National Park , Limestone Gorge, 25–26 Oct 1991, J. Webber ( NTM) ; 1 male, 12°42'S, 132°57'E, Kakadu National Park , Magela Creek, OSS Site 009, 14 Apr 1992, Wells and Webber ( NTM) ; 1 male, same locality, 21–22 Apr 1992, P. Dostine ( NTM) . WA: 1 male, 1 female, Dead Horse Springs , Lake Argyle, 19 Feb 1977, J.E. Bishop ( NMV) ; 1 male, Fine Springs Creek , on road between Lake Argyle tourist village and Duncan Highway, 23 Feb 1977, J.E. Bishop ( NMV) .

Diagnosis. Closely similar to Oecetis radonensis , but male with inferior appendages distally more strongly tapered to sharper apices, a row of setae on the inner margin sub-apically; abdominal segment X triangular; and phallus of medium length with paramere, in lateral view, strongly arched dorsally.

Description. Male. Wings with vestiture short; forewing with a broad scale patch. Anterior wing length, 4.6–4.7 mm.Abdominal tergites II–IV darkly sclerotised; segment IX strongly excavated ventrally, with a pair of small apico-dorsal papillae; segment X broad-based, triangular in dorsal view, elongate and slender in lateral view. Genitalia, see figs 18–20. Pre-anal appendages well separated, in dorsal view, triangular. Phallus of moderate length, apically beak-like in lateral view; paramere strongly twisted at base in ventral view, in lateral view strongly arched dorsally. Inferior appendages in lateral view tapered towards apex, in ventral view stout with apices convergent, short setae on inner subapical margin, basi-dorsal pouch small and rounded.

Distribution. Collected from the north of the NT and the Kimberley Region of northern WA.

Etymology. Named for Chris Humphrey.