Review of the Helochares (Hydrobaticus) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae) Author Short, Andrew Edward Z. Author Girón, Jennifer C. text Zootaxa 2018 2018-04-09 4407 1 29 50 journal article 22806 10.11646/zootaxa.4407.1.2 8e0aac3a-6556-4b96-a67e-fce9f0db0ba9 1175-5326 3766290 B45E9ABD-CB52-4EE7-91D6-783E8E958AC5 Helochares (Hydrobaticus) zamora n. sp. Figs. 2D , 5E , 7B , 10B . Type material. Holotype (male): “ECUADOR:/ Zam.-Chin. Prov. / Zamora / 9 June 1976 / A. Langley et al. ”, “collected in/ roadside pool”, “ECUADOR PEACE CORPS/ SMITHSONIAN INSTITUTION/ AQUATIC INSECT SURVEY”. ( USNM ) . Paratypes (4): ECUADOR : Pastaza Province : 21 km W. Puyo , 9.v.1977 , leg. P.J. Spangler & D.R. Givens , “PGS, DRG-23” ( 1 male , USNM ) ; Zamora-Chinchipe Province : Same data as holotype ( 1 male , SEMC ; 1 female , UNSM) ; Yanzatza , 7.xi.1979 , Rio Yanzatza , sandy margin, leg. J. Anderson ( 1 male , USNM ) . Differential diagnosis. Body size 4.7–4.8 mm . Clypeus appearing dark brown in median third, with lateral thirds distinctly paler ( Fig. 5E ). Elytra with ten rows of serial punctures, usually appearing weakly impressed into striae ( Fig. 2D ). Abdominal ventrites uniformly dark brown; pubescence dense and evenly distributed, the longest hairs shorter than those on the metaventrite. Aedeagus ( Fig. 7B ) 2.2-times longer than its greatest width; apex of parameres rounded, with outer corners widely rounded; inner corners of apex of parameres forming a nearly right angle; lateral outer margins of parameres only slightly diverging on apical half; median lobe with apex broadly rounded. The coloration of the pronotum, which is entirely darkened, will separate this species from all others, as well as the distinct form of the aedeagus. FIGURE 10. Distribution of New World Helochares ( Hydrobaticus ) spp. Description. In addition to differential diagnosis: pronotum dark brown throughout except for anterior and lateral margins, which appear slightly paler ( Fig. 2D ). Ground punctation on head and pronotum moderately impressed. Elytra appearing nearly parallel-sided to slightly broader posteriorly. Distribution. Ecuador ( Fig. 10B ). All three colleting events are from the eastern lowlands of the Andes. Etymology. Named after the type locality of Zamora, Ecuador . Biology. Three specimens are listed as being found in a “roadside pool”, while another was collected along the “sandy margin” of a river.