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Photo#2067074
Nabis in winter grass litter - Nabis alternatus

Nabis in winter grass litter - Nabis alternatus
Sevenmile Creek, 8 km NW of Helena, Lewis and Clark County, Montana, USA
December 3, 2020
Size: 7.0 mm
Somewhat elongate, light brown Hemiptera, crawling on crumbly soil, on steep south-facing bank above small pond in an unburned patch of dead grass litter with standing dead Bromus inermis and Kochia scoparia as well as green leaf tufts of B. inermis.

Elevation ca 4000 feet. Disturbed riparian corridor on stream restoration site within a patchwork of native and non-native grassland.

Keyed to genus in Slater & Baranowski 1978; attempted to get to species in Harris 1928. It seems to come down to N. alternatus or N. americoferus for this specimen.

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Nabis in winter grass litter - Nabis alternatus Nabis in winter grass litter - Nabis alternatus Nabis in winter grass litter - Nabis alternatus Nabis in winter grass litter - Nabis alternatus Nabis in winter grass litter - Nabis alternatus

Revisited in Harris 1928
Moved from Nabis.

Although dark spots are very sparse (but present) on the metatibiae and the connexiva do not have dark patches, while connexival dark patches and dark-spotted metatibiae are typical of N. alternatus, I distinguished this specimen from N. americoferus by the first antennal segment equal to the width of the head through the eyes, plus the pronotum wider than long (1.25x wider in this case). This specimen corresponds to a pale form of N. alternatus described by Harris as "var. uniformis." Cross-checked with Kerzhner & Henry 2008 to confirm that this species is still recognized.

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