A revision of the Australian species of the water beetle genus Hydraena Kugelann (Coleoptera: Hydraenidae) Author PERKINS, PHILIP D. text Zootaxa 2007 2007-05-31 1489 1 1 207 http://dx.doi.org/10.11646/zootaxa.1489.1.1 journal article 10.11646/zootaxa.1489.1.1 1175­5334 5087337 97D649AF-D141-4FBF-9729-192718525E87 Hydraena magnetica Zwick, 1977 ( Figs. 11 , 15 , 210, 248) Hydraena magnetica Zwick, 1977: 180 . Type Material. Holotype (male): Queensland , Magnetic Island [ca. 19° 8' S , 146° 50' E ] [labels: Magnetic I. N. Queensland A. M. Lea // Hydraena magnetica Zwick male Holotypus // DIGITAL IMAGE captured 2004 P. D. Perkins ]. Deposited in the SAMA . Differential Diagnosis. Similar in size, body form and plaques to H . miniretia ; differing therefrom by the non-microreticulate pronotal interstices and the more finely punctate elytral series ( Figs. 11, 12 ). The aedeagi of the two species differ distinctively ( Figs. 15, 16 ). Description . Size: holotype (length/width, mm): body (length to elytral apices) 1.13/0.44; head 0.17/ 0.29; pronotum 0.29/0.37, PA 0.32, PB 0.33; elytra 0.67/0.44. Head and large pronotal macula piceous, margins of pronotum light to dark brown, elytra dark brown, legs and maxillary palpi light brown to testaceous. Frons punctures slightly smaller than 1xef; interstices shining, 2–5xpd. Clypeus microreticulate laterally, finely sparsely punctate medially. Mentum shining, very finely sparsely punctate; postmentum microreticulate. Genae raised, lacking posterior ridge. Pronotal punctures on disc slightly larger than those of frons, interstices shining, 2–3xpd, punctures denser at anterior, interstices ca. 1–2xpd; PF1 and PF4 absent; PF2 very small and shallow, nearly absent; PF3 shallow. Elytral punctures about equal size of largest pronotal punctures. Intervals not raised, shining, width about 1xpd, as are interstices between punctures of a row. Apices in dorsal aspect gradually rounded to subtruncate, in posterior aspect margins form moderately strong angle with one another. Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1/3/4. P1 laminate; median carina angulate in profile. P2 narrow, l/w ca. 2/1, sides parallel, apex blunt. Plaques narrow, elongate ovals, widely separated and nearly parallel to one another, located in posterior 1/3 of metaventrite on sides of shallow median depression. AIS flat, width at arcuate posterior margin 2–3x P2. Protibia slightly widened near midlength; metatibia with small indistinct setae on medial surface of distal 0.5. Last sternite and last tergite simple, symmetrical. Aedeagus ( Fig. 15 ) main-piece much wider distally than at base, with small, hook-like process on apical part of right side; distal piece (ventral view) with two lobes and two curving flagella; parameres simple, left slightly longer than right. Female last tergite with small apicomedian incision, setae slender, tapering; gonocoxite as illustrated (Fig. 210). Distribution. Currently known from several localities in northern Queensland , three localities in southern Queensland , and two localities in Victoria (Fig. 248). Material Examined (137): Queensland , 15 km NE Mareeba , MDPI intercept trap site No. 25, flight intercept trap , elev. 400 m , 16° 56' S , 145° 32' E , 7 January–12 February 1985 , Storey & Halfpapp (1 QPIM ) ; same locality, elev. 400 m , 16° 56' S , 145° 32' E , 20 March–1 May 1985 , Storey & Titmarsh (2 QPIM ) ; 30 km NE Brisbane , Mt. Nebo Road , Pond , ca. 200 m , Sclerophyll forest , elev. 540 m , 27° 24' S , 152° 48' E , 21 August 2004 , M. A. Jäch (AU 1) (3 NMW ) ; 40 Mile Scrub N. P. via Mt. Garnet , MDPI intercept trap site No. 13, flight intercept trap , 17° 40' S , 145° 7' E , 21 December 1985 – 10 January 1986 , Storey & Heiner (2 QPIM ) ; Boggy Ck. , 75 km Cooktown , Cooktown Rd. , 16° 37' S , 145° 21' E , 26 April 1976 , E. B. Britton (7 ANIC ) ; Broken River , 50 miles W of Mackay , 19° 32' S , 144° 54' E , 30 November 1968 , S. Misko (5 ANIC ) ; Burnett River , Mt. Perry Rd. , 25° 23' S , 151° 46' E , 15 August 2004 , A. Glaister (1 NMW ) ; Danbulla St. For., via Atherton , 17° 10' S , 145° 39' E , 14 June 1978 , D. Gibson (1 ANIC ) ; Emu Creek , 20 km S. Mareeba , 16° 58' S , 145° 25' E , 20 October 1990 , D. Larson (10 MCZ ) ; Girraween N. P. , Bald Rock Creek at "Under-ground Creek", ex. sand/gravel streambank, 28° 51' S , 151° 57' E , 22 January 1998 , P. D. Perkins (64 MCZ ) ; Mulgrave River , The Fisheries , 17° 11' S , 145° 44' E , 9 November 1990 , D. Larson (1 MCZ ) ; Palmerston N. P. , Learmouth Creek , ca. 14 km SE Millaa Millaa , on loop road, ex. bare rocks in splash zone, 17° 34' S , 145° 42' E , 16 January 1998 , P. D. Perkins (7 MCZ ) ; Parmentier Crk. , 7 miles SW Kuranda , 16° 49' S , 145° 38' E , 21 March 1969 , J. Balfour-Browne (11 BMNH ) ; Reedy St. , George R . Cooktown Rd. , 16° 28' S , 144° 46' E , 22 May 1976 , E. B. Britton (3 ANIC ) ; Victoria , Lerderderg River , 6.8 km N Bacchus Marsh , wet gravel and cobbles at edge of small river; dry sclerophyll forest, elev. 135 m , 37° 37' S , 144° 25' E , 20 September 1999 , N. Porch (64) (18 ANIC ) ; McKillops Bridge , Snowy River , gravel at edge of large and rising river; dry sclerophyll forest, elev. 185 m , 37° 5' S , 148° 23' E , 6 November 2000 , N. Porch (NP 16) (1 ANIC ) .