Dibolocelus Bedel, 1891: 309 Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera Hydrophilidae) from Mexico with description of two new species Arce-Pérez, Roberto Arriaga-Varela, Emmanuel Novelo-Gutiérrez, Rodolfo Navarrete-Heredia, José L. Zootaxa 2021 2021-09-01 5027 3 387 407 Bedel, 1891 Bedel 1891 [151,624,1757,1784] Liliopsida Restionaceae Hydrophilus Plantae Poales 1 388 Tracheophyta subGenus Dibolocelus      Dibolocelus Bedel, 1891: 309.    Typespecies:  Hydrophilus palpalis  Brullé, 1837 .   Diagnosis.In addition to the characters for the genus ( Short 2010), adult  Hydrophilus( Dibolocelus)can be differen- tiated from those of  Hydrophilus( s. str.) by a more convex and robust body shape; maxillary palps usually modified being generally longer, broadened and curved towards apex, sometimes inflated and curved at mid-length, with third palpomere with deep and wide ventral excavation or flat and slightly widened towards the apex; labial palp widely triangular and inflated, clavate or subparallel in shape, with or without setae on lateral margins; fifth protarsomere wide and longer than any of the previous ones, sometimes slightly flattened and with a ventral laminar expansion, never as large as those in  Hydrophilus( s.str.); internal spur of anterior tibia flat, sub-rectangular or rounded, with straight or curved external margins, if sub-rectangular then it can be short or long with its apex straight, irregular or clearly bifid; abdominal ventrites 3 and 4 have slight to well-marked oval, glabrous area at mid-line, and ventrite 5 has a wide oblong or sub-triangular glabrous area; ventrites 3 to 5 slightly raised at midline, flattened or forming a keel, slightly projected above ventrite posterior margin.