Australian Diplectroninae reviewed (Insecta: Trichoptera), with description of 21 new species, most referred to a new genus Wells, Alice Contents, Arturs Neboiss Table Of Zootaxa 2018 2018-04-27 4415 1 1 44 Wells & Contents, 2018 Wells & Contents 2018 [151,388,605,631] Insecta Hydropsychidae Austropsyche GBIF Animalia Trichoptera 15 16 Arthropoda species acuta sp. nov.    Material examined. Holotype ♂, New South Wales,  Crystal CreekRainforest Resort, Upper Crystal Creek,  26– 27.xii.2016, A. Wells( ANIC).    Paratypes, Queensland: 45♂ 13♀,  Crystal CreekRainforest Resort, Upper Crystal Creek, 28°15'S 153°15'E,  26–27.xii.2016, A. Wells; data as for holotype ( ANIC);  4♂ 3♀, same locality,  26.xii.2006, A. Wells( NMV).    Othermaterial examined. New South Wales: 1♂, Korumbyn Creek, 28°24'S 153°19'E, eastern slope of Mt Warning,  29.vi.1988, A. Neboiss;  2♂ 5♀, Orara West State Forest, Tucker's Knob, 29°41'S 152°48'E,  22.xi.1990, G. Theischinger;  13♂ 3♀, Upper Crystal Creekat Crystal CreekRainforest Retreat, 28°15'S 153°15'E,  24.xii.2006, A. Wells;  18♂ 13♀, same locality,  25.xii.2006, A. Wells;  1♀, same locality,  22.xii.2016, A. Wells;  4♂ 3♀, same locality,  22.xii.2016, A. Wells;  42♂ 6♀, ♀, same locality,  25–26.xii.2016, A. Wells. SE Queensland:  1♂, Coomera Creek, Lamington NP,  8.ii.1961, F.A. Perkins[TRI-13850];  1♂, Queen Mary Falls, Killarney,  12.x.1973, A. Neboiss;  1♂, Teviot Brooknr Wilson’s Peak,  18.xi.1980, M. Schneider;  1♂ Conondale Range, Bundaroo Creek, rainforest,  1.xii.1983, G. Cassis& D. Bickel[TRI-39868];  8♂, same data [TRI-39499].   Diagnosis.This species forms a set with  Austropsyche ambigua, here termed the  Au. acutaGroup, characterised by having the forewing median cell short, about equal in length to the discoidal cell; in the male genitalia, paired elongate sclerotised spines arise internally at the base of the deep apodeme connected to the gonopods and the mesal processes on the coxopodites arise apically, not subapically or basally. It is distinguished from  Au. ambiguaby having the apicomesal process on the coxopodite at least half length of harpago, needle-like, and subtended dorsally by a small conical lobe.   Description.Length of each forewing: ♂ 9.2–11.1 mm(n = 10), ♀ 11.4–12.2 mm(n = 9); cross-vein r-manterad of cross-vein closing median cell. Male. Abdomen swollen, internal sacs all elongate, each sack extending length of two segments; on segment V lateral filament length slightly less than length of segment ( Fig. 83). Genitalia ( Figs 59–60): Segment IX subquadrate, tergites IX and X partly fused; gonopods each with coxopodite almost equal width throughout length, narrow sharp process apicomesally, small conical dorsal lobe at base, harpago about length of coxopodite, elongate digitiform; phallic apparatus cylindrical, dilated apically, without endothecal spines; pair of elongate slender spines lateral to phallus, arising at base of apodemes connected to gonopods, converging apically. Female. Abdominal segment VIII ( Figs 100–101) with sternal plates separated, but indistinctly, tapered distally with apicolateral angles triangular; cerci and apical papillae on segment X relatively large, as for  Au. victoriana.   Remarks.Unlike males of most caddisfly species, males of  Au. acutaare as large as, or larger than the associated females, and have sizeable, swollen abdomens. On dissection one finds that much of the abdominal cavity is occupied by the 2 pairs of reticulate-walled sacs. That, coupled with the fact that most of the light trap specimens collected in 2017 were male, leads to speculation that the sacs, which appear to be glands, may be involved in male-male attraction, in lekking behaviour. 1841138445 2016-12-26 2016-12-27 2016-12-26 ANIC A. Wells Upper Crystal Creek Crystal Creek Rainforest Resort Crystal Creek 15 16 1 1 New South Wales holotype 1841138453 2016-12-26 2016-12-27 2016-12-26 ANIC A. Wells Crystal Creek Rainforest Resort -28.25 Upper Crystal Creek 1233 153.25 Crystal Creek 15 16 58 13 45 Queensland paratype 1841138449 [777,1362,820,845] 2006-12-26 2016-12-27 2016-12-26 NMV A. Wells Crystal Creek Rainforest Resort -28.25 Upper Crystal Creek 1233 153.25 Crystal Creek 15 16 7 3 4 Queensland paratype 1841138485 1988-06-29 Mt Warning & A. Neboiss United Kingdom -28.4 Korumbyn Creek 1232 153.31667 Other 15 16 1 1 New South Wales 1841138439 1990-11-22 G. Theischinger United Kingdom -29.683332 Tucker's Knob 1226 152.8 Orara West State Forest 15 16 7 5 2 New South Wales 1841138442 2006-12-24 A. Wells United Kingdom -28.25 Crystal Creek 1233 153.25 Upper Crystal Creek 15 16 16 3 13 New South Wales 1841138473 [266,799,964,989] 2006-12-25 A. Wells United Kingdom -28.25 Crystal Creek 1233 153.25 Upper Crystal Creek 15 16 31 13 18 New South Wales 1841138476 [811,1272,964,989] 2016-12-22 A. Wells United Kingdom -28.25 Crystal Creek 1233 153.25 Upper Crystal Creek 15 16 1 1 New South Wales 1841138426 2016-12-22 A. Wells United Kingdom -28.25 Crystal Creek 1233 153.25 Upper Crystal Creek 15 16 7 3 4 New South Wales 1841138467 [501,1274,999,1024] 2016-12-25 2016-12-26 2016-12-25 A. Wells. & SE Queensland United Kingdom -28.25 Crystal Creek 1233 153.25 Upper Crystal Creek 15 16 49 7 42 Queensland 1841138466 1961-02-08 Lamington NP & F. A. Perkins United Kingdom Coomera Creek 15 16 1 1 Queensland 1841138483 1973-10-12 A. Neboiss United Kingdom Killarney Queen Mary Falls 15 16 1 1 Queensland 1841138486 [258,969,1071,1096] 1980-11-18 M. Schneider United Kingdom Wilson's Peak Teviot Brook 15 16 1 1 Queensland 1841138472 1983-12-01 G. Cassis & D. Bickel United Kingdom Bundaroo Creek Conondale Range 15 16 1 1 Queensland 1841138479 [810,1128,1108,1133] 1983-12-01 G. Cassis & D. Bickel United Kingdom Bundaroo Creek Conondale Range 15 16 8 8 Queensland