Boreus bomari  Byers & Shaw, 2000

Basic coloration black with short, sparse pilosity.  Rostrum short = males 1.29 – 1.33 vertical width of compound eyes; females 0.52-0.57 the length of the ovipositor.  Four to five long, submarginal setae on either side along anterior margin of pronotum; 5-6 long, submarginal setae on either side along posterior margin of pronotum.  No long setae on meso- and metanota.  Male forewings gradually tapered to apex with 13 – 15 costal spines; 14 – 18 mesal spines.  Hindwing with 4 – 6 spines near mid-length.  Female forewings oval with sparse, short setae, overlapping hindwing.  Male 8th and 9th tergites and sternites not fused.  Male hood on 9th tergite with medial cleft and approximately 25 denticles on either side; ninth sternite notched medially.  Total body length of male in alcohol 2.4 – 3.1 mm; female 3.6 – 4.1 mm; pinned male 2.0 – 2.7 mm; pinned female 2.9 – 3.8 mm.


Distribution – Geographical:  All known specimens are from Albany and Sheridan Counties, Wyoming.


Distribution – Temporal:  Adults of this species have been collected from 9 November until 20 December.


Ecology: Many of the specimens were collected in a montane sagebrush meadow at 2591 m (8500 ft) elevation.  This habitat is open, wind-swept, and rather dry, with little or no moss (Byers & Shaw, 2000).  This is a harsh habitat with seemingly little opportunity for feeding on mosses.


Biology:  Nothing is known of immature stages or life cycle.


Notes:  This species’ most distinctive characteristic is its quite short rostrum for a species of Boreus.  The notched ninth sternite of the male links it with Boreus nix and B. pilosus in the West and B. brumalis in eastern North America.  It does not have the long, thick pilosity of B. nix and B. pilosus, and the shorter rostrum will serve to separate it from B. brumalis.

The name bomari comes from Charles R. Bomar, the collector of the original series of specimens, who recognized it as a new species back in 1991.




Byers, G.W. and S.R. Shaw.  1999 [2000].  A new species of Boreus (Mecoptera: Boreidae) from Wyoming.  Journal of the Kansas Entomological Society  72(3):322-326.



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