NEW PSELAPHIDAE FROM NEW HAMPSHIRE ( COLEOPTERA ) BY

Two species of undescribed Pselaphidae were discovered during a comparison of the fauna of an uncut and a 40 year-old forest. The species are described here to provide names for a forthcoming paper comparing the pselaphid fauna of these two sites. Holotypes were cleared, disarticulated, and mounted on slides in Canada Balsam. Both are placed in the Field Museum of Natural History, Chicago. All measurements of specimens are in millimeters. I would like to thank certain individuals for the loan of specimens, greatly extending the known ranges of these two new species. The abbreviations used to indicate specimen deposition follows the individual’s affiliation: Rickard Baranowski, Lund University, Sweden (RBC); J. Milton Campbell, Biosystematics Research Institute, Ottawa, Canada (CNCI); Michael A. Ivie, Montana State University, Bozeman (DZEC); and Alfred F. Newton, Jr., Field Museum of Natural History, Chicago (FMNH). Specimens otherwise lacking an indication of deposition are in the collections of the author and the University of New Hampshire. I would like to thank J. F. Burger and R. Marcel Reeves, University of New Hampshire, for reviewing the manuscript.

Males with small spur at apices of all tibiae, metatrochanters at base with large medially directed spur; sternites IV-V simple, convex medially, VI obscurely depressed at middle, short aciculate setae in depression forming arc, division of sternite VII arcuate to left.
Discussion: This species is quite distinct among the Nearctic species of Euplectus by the presence of basal carinae on tergite III, spur of the male metatrochanters, simple sternites IV-VI, and smooth vertexal area.Since two species of Euplectus have been introduced to North America from Europe, the major faunal works of Jeannel (1950) for France and Besuchet (1974) for Central Europe were checked to be certain this species had not been previously described.
In Wagner's (1975) recent revision of the Nearctic species of Euplec- tus, this species would be placed in the californicus-group.Silvicolus may be separated at couplet 5 of Wagner's key by the lack of any papilliform setae in the depression of sternite VI.This species differs from the generic diagnosis of Grigarick and Schuster (1980) in pos- sessing basal carinae on tergite III, which are lacking in all other Nearctic species and also in the twenty Palearctic species in my collection.
Females lacking spurs of tibiae and trochanters, lacking tubercles of sternites II-III.
Biology" Collected in rotten beech and birch logs in uncut forests in New Hampshire.
Discussion: This species is very similar to Actizona chuskae Chandler from Arizona (Chandler 1985) in appearance and male characters.The genitalic form of borealis is identical in the British Columbia and New Hampshire specimens, and differs from that of chuskae in the form of the apex and internal spines of the aedeagus.These genitalic differences and the pubescent vertexal foveae of borealis readily separate the two species.

SUMMARY
Two undescribed species of Pselaphidae, Euplectus silvicolus n. sp. and Actizona borealis n. sp., were discovered during a faunal comparison of the forest floor Coleoptera of cut and uncut forests in New Hampshire.