New records and description of fifty-four new species of aquatic beetles in the genus Hydraena Kugelann from South America (Coleoptera: Hydraenidae) Author Perkins, Philip D. text Zootaxa 2011 2011-10-28 3074 1 198 journal article 31530 10.5281/zenodo.1050060 2d28bebf-e3c5-457b-9152-8a6877ded281 1175-5326 1050060 Hydraena dariensis , new species Figs. 76 (habitus), 80 (aedeagus), 162 (female abd.), 178 (spermatheca), 203 (map) Type Material. Holotype (male): Colombia : Rio Atrato, Sautata, muddy puddles in marsh, 27–31 iii 1972 , M. E. Bacchus. Deposited in the BMNH . Paratypes (21): Colombia : Same data as holotype (5 BMNH ); Rio Parencho, La Lomas, small puddle in clay, 23–26 iii 1972 , M. E. Bacchus (4 BMNH ); Magd., Rio Frio [no date], P. J. Darlington (12 MCZ ). Differential Diagnosis. A relatively densely punctate species, especially on the elytra, with a distinctive rectangular pronotal macula ( Fig. 76 ). The male genitalia suggest a relationship with H. beniensis ( Figs. 79–80 ); refer to the diagnosis of that species. Description . Size: holotype (length/width, mm): body (length to elytral apices) 1.11/0.49; head 0.19/0.30; pronotum 0.30/0.39, PA 0.33, PB 0.35; elytra 0.67/0.49. Dorsum of head piceous; pronotum testaceous around rectangular piceous macula, ratios of color bands, as measured in midline, ca. 4/11/5 ; elytra dark brown; legs light brown to testaceous; maxillary palpi testaceous, tip not darker. Frons punctures ca. 1.5–2xef, slightly larger and denser near eyes than medially; interstices shining, ca. 1xpd laterally, 2–4xpd medially. Clypeus microreticulate laterally, very finely sparsely punctulate medially. Mentum and postmentum finely, moderately densely punctulate, shining. Genae raised, shining, without posterior ridge. Pronotum weakly arcuate laterally; anterior margin straight behind eyes, emarginate behind frons, scintilla absent; punctures on disc slightly larger and deeper than largest punctures on frons, interstices shining, ca. 1–2xpd on disc, punctures larger and denser at anterior and posterior; PF1, PF2 and PF4 absent; PF3 shallow. Elytra weakly arcuate laterally; summit of posterior declivity at ca. midlength; lateral explanate margins narrow; on basal 1/3 punctures ca. 1xpd largest pronotal punctures, punctures becoming slightly smaller and more widely spaced toward posterior. Intervals not raised, shining, on basal 1/3 ca. 1xpd, as are interstices between punctures of a row, a few punctures subserial. Apices in dorsal aspect conjointly rounded, in posterior aspect margins forming very shallow angle with one another. Ratios of P2 width and plaque shape (P2/w/l/s) ca. 2/1/4/3. P1 slightly wider than laminate; median carina sinuate in profile. P2 l/w ca. 2/1, sides slightly converging toward blunt apex, apex raised slightly above mesoventral intercoxal process. Plaques narrow, straight, parallel or nearly so, not raised, located at sides of moderately deep median longitudinal depression. Metaventrite with very short longitudinal ridge on each side, extended posteriorly from margin of each mesocoxal cavity. AIS width at straight posterior margin ca. 1.5x P2. Legs simple. Male abdominal apex symmetrical. Female (microslide mount, n=1): last tergite broadly rounded, without apicomedian notch, ca. 22 (n=1) strongly hooked setae, no median gap; gonocoxite not midlongitudinally divided, apical margin sharply rounded, low transverse ridge evident at border of microreticulation ( Fig. 162 ); spermatheca not C-type, with concave capsule ( Fig. 178 ). Etymology. Named in reference to the type locality. Distribution. Currently known from northwestern Colombia ( Fig. 203 ).