Hydrochus vagus LeConte

Perkins, Philip D., 2021, Taxonomy of Central American water beetles in the genus Hydrochus Leach, 1817 (Coleoptera: Hydrochidae), Zootaxa 4974 (3), pp. 459-503 : 479-480

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https://doi.org/ 10.11646/zootaxa.4974.3.2

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Hydrochus vagus LeConte


Hydrochus vagus LeConte View in CoL

Figs. 1 View FIGURE 1 , 13, 14 View FIGURES 13–14 , 27 View FIGURES 25–27. 25 , 30 View FIGURES 28–30

Hydrochus vagus LeConte 1852: 211 View in CoL .

Hydrochus daviniaae Makhan 1995 View in CoL . Syn. Worthington et al. 2016.

Lectotype designation: There are three syntypes in the LeConte collection at the MCZ, consisting of one female and two males. Both males have been dissected, and are conspecific. The male labeled “vagus 3” is hereby selected as lectotype, and images of the habitus, male genitalia, and labels of this specimen given herein ( Figs. 14 View FIGURES 13–14 , 27 View FIGURES 25–27. 25 ). The female and the second male (“vagus 2”) have been labeled paralectotypes. Originally described from California [“(Desert of) Colorado”], the following locality records are from Mexico.

Material examined (76): Mexico: Campeche, 21 mi. E . Campeche, 27.vii.1964, leg. Paul J. Spangler (1 NMNH) ; Nayarit, 18 mi. N.W. Tepic, 27.xi.1948, leg. H. B. Leech (3 CAS) ; Nuevo Leon, 10 km N Linares ; ex. mercury vapor lite, elev. 430 m, 22.iii.1991, leg. R. Brooks, R. Leschen (7 SEMC) ; San Luis Potosi, 5 mi. N. Tamazunchale, 21.v.1974, leg. P. D. Perkins (5 MCZ) ; Ciudad Valles, 22.viii.1964, leg. Paul J. Spangler (4 NMNH) ; El Salto , 19.vi.1952, leg. no collector on label (5 SEMC) ; Mpio. Tanlajas, Rancho El Nacimiento, Nacimiento Río Coy , 46 m, 8.vi.2013, 21°43´54.1’’ N, 98° 58’ 35.4’’ W, D. Reynoso col. (3 IEXA) GoogleMaps ; Sinaloa, Los Mochis , 20.vii.1922, leg. C.T. Dodds (2 CAS) ; Mazatlan , 12 mi. S., 17.xii.1963, leg. L. & C. W. O’Brien (1 NMNH) ; same locality, 17.xii.1963, leg. M. J. Tauber, C. A. Toschi (5 NMNH) ; Tamaulipas, 2 mi. SW Ciudad Victoria , stream in desert, 27.vii.1974, leg. M. E. and P. D. Perkins (14 MCZ) ; 8 miles west of El Limon , 20.vii.1970, leg. Murray, Phelps, Hart, Schaffner (4 TAMU) ; Bocatoma, 7 Km SSE Gomez Farias , 25-30.iii.1978, leg. E. G. Riley (1 TAMU) ; Ciudad Mante, 24.viii.1964, leg. P. J. Spangler (1 FSCA, 8 NMNH); Nuevo Morelos, 28.viii.1965, leg. P. J. Spangler (7 NMNH) ; Veracruz, 15 Mi. SE Tantoyuca, 28.viii.1965, leg. Paul J. Spangler (1 NMNH) ; 8 Mi. NE Panuco , 28.viii.1965, leg. P. J. Spangler (3 NMNH) ; Cerveceria Moctezma , 3.viii.1965, leg. Rabago (2 NMNH) .

Differential diagnosis. Among Central American species, recognized by the combination of moderate size (ca. 2.88 mm), the deep pronotal depressions, the well raised and relatively impunctate pronotal reliefs, and the male genitalia ( Figs. 13, 14 View FIGURES 13–14 ; described below). This species has a generalized Hydrochus habitus; reliable determinations will require dissection of males. The male genitalia are somewhat superficially similar to that of H. scintillatus ; however, in H. scintillatus the pdmm are much more widely separated, the adbl is larger, the dorsal margin of the aedeagus, in lateral view, is not concave, and the avtl is located farther from the aedeagus base.

Male genitalia ( Figs. 13, 14 View FIGURES 13–14 ). General characters: paramere tips slender and pointed, apex narrower in lateral view than in dorsal/ventral views, in dorsal/ventral views with medial margins at apex parallel or nearly so, then arcuate away from midline, narrow proximal to plsa; aedeagus in dorsal/ventral views slender in distal ½, wider in proximal ½, agw at ca. proximal 13, in lateral view wider basally, with no emargination where adbl and shaft meet; lateral margins of aedeagus sclerotized; basal piece shorter than parameres, orifice strongly sclerotized.

Dorsal surface: pdmm narrowly separated, overlapping aedeagus; adbl large; adtl at ca. distal 1/3; paramere tips without sclerotized ridge.

Ventral surface: pvmm approximating lateral margin of aedeagus; avtl near base.

Remarks. The non-type specimen imaged ( Fig. 13 View FIGURES 13–14 ) has the following locality data: Tamaulipas, 2 mi. SW Ciudad Victoria, stream in desert, 27.vii.1974, leg. M. E. and P. D. Perkins.


Smithsonian Institution, National Museum of Natural History


California Academy of Sciences


University of Kansas - Biodiversity Institute


Museum of Comparative Zoology


Florida State Collection of Arthropods, The Museum of Entomology














Hydrochus vagus LeConte

Perkins, Philip D. 2021

Hydrochus vagus

LeConte, J. L. 1852: 211
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