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Photo#1729569
Stethorhanis borealis Blaisdell - Stethorhanis borealis - male

Stethorhanis borealis Blaisdell - Stethorhanis borealis - Male
Mt. St Helens, Skamania County, Washington, USA
July 12, 2005
Size: 2.4 mm
This was captured in a pitfall trap in the ongoing study of this volcano since its 1980 eruption. As of today this is a new genus for this site. It is like a small Phymaphora but the male antennal club is not enlarged.
Stethorhanis was described by Blaisdell in 1931 and he added a second species in 1934. This is S. borealis Blaisdell, 1934. I had to dig out both of those papers to know for sure and only males can be easily separated. The metatibiae are sexually dimorphic in borealis but not in S. vandyckei, the first described species. This is clearly a borealis male because the metatibia is abruptly enlarged apically. There are also distinguishing features of the pro and mesotibiae. The vague color pattern of the dorsal image is described by Blaisdell but not by Hatch.
I have included a tarsal image because the key in Am. Beets is slightly misleading and it could be difficult to decide if this is pseudotrimerous with lobed segments 1 and 2, or linear. Like several other genera, this should be called linear in using the key.

Images of this individual: tag all
Stethorhanis borealis Blaisdell - Stethorhanis borealis - male Stethorhanis borealis Blaisdell - Stethorhanis borealis - male Stethorhanis borealis Blaisdell - Stethorhanis borealis - male Stethorhanis borealis Blaisdell - Stethorhanis borealis - male Stethorhanis borealis Blaisdell - Stethorhanis borealis - male

fantastic.... thanks a ton, Rick.
Moved from Leiestinae.

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