Review of the Helochares (Hydrobaticus) MacLeay of the New World (Coleoptera: Hydrophilidae: Acidocerinae) Short, Andrew Edward Z. Girón, Jennifer C. Zootaxa 2018 2018-04-09 4407 1 29 50 8Y4CJ Short & Girón, 2018 Short & Girón 2018 [151,554,655,681] Insecta Hydrophilidae Helochares Animalia Coleoptera 7 36 Arthropoda species laevis sp. nov. Hydrobaticus   Figs. 4B, 7J, 10B.   Type material.   Holotype(male):“ MEXICO: Chiapas/ San Cristoballas Casas/  17-21.vii.1964/ leg. P.J. Spangler”, “grass chocked stream on edge of town” ( USNM).    Paratypes: (5): MEXICO: Chiapas:  20 kmNE of San Cristobalde las Casason road to Tenejapa, Las Ollas, “bog”,  6.iii.1965, leg. D. E. Breedlove( 4 females, CAS, SEMC); same data as holotype ( 1 female, USNM).   Differential diagnosis.Body size 6.2–6.8 mm. Clypeus dark yellow to orange with the central third darkened to dark brown. Elytra without any detectable serial punctures or striae ( Fig. 4B). Abdominal ventrites uniformly dark brown; pubescence dense and evenly distributed, the longest hairs shorter than those on the metaventrite. Aedeagus ( Fig. 7J) 2.3-times longer than its greatest width; apex of parameres truncate, with outer corners rounded; inner corners of apex of parameres forming an acute angle; lateral outer margins of parameres parallel along basal two thirds, slightly constricted at two thirds, diverging along apical third; maximum width of aedeagus at basal half, clearly narrower than maximum width of aedeagus at apical half; median lobe with apex gradually tapering to an acute point. This species is extremely similar to  H. politus, with the primary difference being in the form of the aedeagus ( Fig. 7J).   Description.In addition to differential diagnosis: pronotum dark brown to black in central half ( Fig. 4B). Ground punctation on head and pronotum moderately impressed, slightly less impressed on the elytra.   Distribution. Mexico( Chiapas) ( Fig. 10B).   Etymology. Laevis(L), after the smooth elytra which lacks any coarse serial punctures or striae.   Biology.One series was collected in a “bog”, while the other was collected in a “grass chocked stream”. 2608702029 1964-07-17 1964-07-21 1964-07-17 USNM P. J. Spangler Mexico Casas San Cristobal 7 36 1 Chiapas holotype 2608700999 1965-03-06 1964-07-21 1964-07-17 CAS, SEMC, USNM D. E. Breedlove Mexico Casas Las Ollas Tenejapa 7 36 5 5 Chiapas paratype