Abstract
Two new species of Pterostichus Bonelli subgenus Pseudoferonina Ball, are described from the mountains of central Idaho: Pterostichus bousqueti Bergdahl [type locality = small tributaries of South Fork of Payette River watershed, ca. 1170 m (3840 ft), 44.0675°; -115.6822°, near Lowman, Salmon River Mountains, Boise County, Idaho, U.S.A.] and Pterostichus lolo Bergdahl [type locality = Cottonwood/Orogrande Creek, ca. 870 m (2850 ft), 46.5528°; -115.5522°, North Fork of Clearwater River watershed, Clearwater Mountains, near Bungalow, Clearwater County, Idaho, U.S.A.]. Males of Pterostichus bousqueti and Pterostichus lolo are easily distinguished from each other and the seven previously described Pseudoferonina species by the form of the median lobe of the aedeagus, and from most individuals of the other species of Pseudoferonina in Idaho by features of pronotal shape and macrosculpture. Both species appear to be obligate ripicolous hygrophiles, restricted in distribution primarily to the margins of small montane streams in forested areas. Widespread intensive stream surveys for Pseudoferonina over many years indicate the geographic ranges of both species are highly localized, and additional undescribed species may occur in Idaho.
Highlights
Pterostichus Bonelli (1810) is one of the largest genera of carabid beetles in North American north of Mexico, including about 200 described species and subspecies, classified in about 20 species groups and at least as many recognized subgenera (Bousquet and Larochelle 1993; Bousquet 1999)
The purpose of this paper is to describe two new species of Pseudoferonina from the Clearwater and Salmon River mountains of central Idaho, including information about form and structure, geographical and habitat distributions, and way of life
All nine described species in the Pterostichus subgenus Pseudoferonina are endemic to the Pacific Northwest (PNW)
Summary
Pterostichus Bonelli (1810) is one of the largest genera of carabid beetles in North American north of Mexico, including about 200 described species and subspecies, classified in about 20 species groups and at least as many recognized subgenera (Bousquet and Larochelle 1993; Bousquet 1999). Adults of all Pseudoferonina species are strict ripicolous hygrophiles whose habitat is the margin of small, forested headwater streams in mountainous terrain. They can be found from near sea level to subalpine elevations, but especially mid-montane zones where low (0–2) order streams (Strahler 1957) are common.
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