. Classification of the Coleoptera of North America [microform]. Beetles; Beetles; Coléoptères; Coléoptères. 114 COLECH'TEUA OF XOIITII AMEIIICA. Fam. XXIX.—parnidae. I. 3i i l^i'i"ife<cx ,.% n » Mentum corneous, trapezoidal, or emarginate in front; ligula large, not lobeil. Maxilho exposed at the base, with two unarmed lobes. Antenna) variable in form and position. Head usually retractile; lubrum distinct; mandibles small; eyes rounded. Prothorax with the side pieces not separate; eoxal cavities widely open behind, completed by the mesosternum, variable in form; prosternum prolonged b
. Classification of the Coleoptera of North America [microform]. Beetles; Beetles; Coléoptères; Coléoptères. 114 COLECH'TEUA OF XOIITII AMEIIICA. Fam. XXIX.—parnidae. I. 3i i l^i'i"ife<cx ,.% n » Mentum corneous, trapezoidal, or emarginate in front; ligula large, not lobeil. Maxilho exposed at the base, with two unarmed lobes. Antenna) variable in form and position. Head usually retractile; lubrum distinct; mandibles small; eyes rounded. Prothorax with the side pieces not separate; eoxal cavities widely open behind, completed by the mesosternum, variable in form; prosternum prolonged behind the coxoe. Mesosternum sometimes excavated, sometimes emarginate; side pieces attaining the coxas. Metasternum with side pieces wide or narrow; epimera (except in Psephenus) not visible. Elytra entire; epipleura) narrow, sometimes extending to the apex. Abdomen with five, in Psephenus with seven ventral seg- ments, the anterior ones connate. Anterior coxa) transverse, with large trochantin, or rounded, without trochantin; middle coxie oval, not contiguous; pos- terior coxa3 transverse, dilated into a plate partly protecting the thighs, and contiguous in the first and second sub-fami- lies; distant and not forming a plate in Elmidas. Legs slender, usually long; tibiiu without distinct terminal spurs; tarsi 5 jointed, joints 1—-i short, equal, fifth longer than the others conjoined, large, with large simple claws. A family containing three very distinct snb-farnilics, and show- inir very diverse affniitics not only with the preceding and following faniilies, but also, by the form of the antenna; of various members, with the Gyrinido;, and with some families of the Scrrieorn series, especially the Ilelodidie and Dascyllidic; a more distant rela- tionship with the Donacia tribe of the Chrysomclida;, by the form of the tarsi of Ha^monia, has also been pointed out by Lacordairc. Abdomen with seven ventral segments ; anterior coxae with very large tro- chantin. PSEPHENI
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