|scientific name Chrysops noctifer |
Montane habitats with mineral soils and moderate organic matter, such as the margins of beaver ponds and shallow, slow-moving streams (Teskey, 1985).
Chrysops noctifer has a very broad flight period, from late April to early September, but the peak period is July.
Females are 8-11 mm in length and very dark. On the head, the frons is slightly broader than high, and very glossy black; the antennae are black, with reddish hints; the clypeus and gena are glossy black, the clypeus with a median pruinose stripe extending half its length (Teskey 1990). The thorax is not striped, but is subglossy black with black and pale hairs together; the pleura are grayish, with white hair; the legs are black; the wings have a dilute apical spot separated from the crossband (Teskey 1990).
The males are similar to the females, but even blacker; most abdominal and thoracic hairs are black (Teskey 1990).
The combination of dark coloration and the dilute apical infuscation (pigmentation) separate from the crossband of the wing make this deerfly unmistakable (Teskey 1990).
Little is known of the life history of C. noctifer.
Chrysops noctifer has the most restricted range of all the western deerflies, but is not considered threatened or in need of conservation.
Nothing is known of the dietary habits of the larvae of C. noctifer; the adults are presumed to subsist primarily on flower nectar, as most tabanids do.
A western montane species, extending down the Rocky Mountains from the Yukon Territory south through British Columbia and western Alberta into California and as far south as Colorado (Teskey 1990).
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