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Descriptions and illustrations of the triungulin, 5th instar, and prepupal larval forms for Nematodes penetrans (LeConte, 1852) (Coleoptera: Eucnemidae: Macraulacinae: Nematodini) are given. The descriptions are based on triungulins collected in a plastic vial as well as 5th instars and prepupal larval stages collected from hard sections of sugar maple (Acer saccharum Marshall; Aceraceae) logs and limbs. Adults were reared from those pieces placed in plastic bags. Biological information is provided, based on literature search and personal observations.
Comparative studies between larvae of N. penetrans and the European species, Nematodes fi lum (Fabricius, 1801) along with other Nearctic larval forms are briefl y discussed. This discovery represents the fi rst larval description for the genus in the Nearctic region.
Descriptions and illustrations of the fi fth instar and prepupal larval stages of Stethon pectorosus LeConte, 1866 (Coleoptera: Eucnemidae: Eucneminae: Mesogenini) are provided. These are the fi rst larval descriptions for the genus Stethon LeConte within the subfamily Eucneminae in the Nearctic region. Biological information is provided and comparison with larval morphology of other Eucnemidae is briefl y discussed.
Fifth instars for eight of the nine species of Microrhagus Dejean (Coleoptera: Eucnemidae: Melasinae:
Dirhagini), all endemic in the Nearctic region, are described and illustrated. Biological information is provided, along with a brief discussion of the larval morphology among the eight Nearctic species of Microrhagus. Adult descriptions
are provided for four new species. These new species include Microrhagus breviangularis new species, Microrhagus carinicollis new species, Microrhagus lecontei new species and Microrhagus opacus new species.
A checklist and identifi cation keys for both adults and most known larvae are provided.