Acanthocnema nigrimana ( Zetterstedt, 1846 )

Acanthocnema nigrimana ( Zetterstedt, 1846) View in CoL

Figs 21–28, 60

Cordylura nigrimana Zetterstedt, 1846: 2040 View in CoL . Type locality: “Jemtlandia boreali” [= northern Jämtland], Sweden.

Hydromyza tiefi Mik, 1884: 252 . Type locality: Salzburg, Austria.

Diagnosis

This species is distinguished by the yellowish-brown mid and hind femora, male postpedicel yellow ( Figs 21, 23), proepimeral seta present ( Fig. 21), wing crossveins cloudy, R 2+3 distal to cell dm without surrounding infuscation ( Figs 22–23), posthumeral (presutural intra-alar) seta usually present ( Fig. 21). Sternite 5 bilobate with medially curved apex ( Fig. 26) and epandrium prolonged laterally and surstylus truncate apically with long setae ( Figs 24–25, 27–28).

Material examined

AUSTRIA • 1 ♂; Bad Vellach; 24 Jul. [no year]; Oldenberg leg.; USNM .

2+3

CANADA – British Columbia • 1 ♂; Ketchum Lake ; [ 58.25° N, 131.5° W]; 3600 ft a.s.l.; 26 Aug. 1960; W.W. Moss leg.; moss-grass bog; CNC GoogleMaps . – Newfoundland and Labrador • 1 ♀; Hebron ; [ 58.199° N, 62.625° W]; 12 Jul. 1954; J.F. McAlpine leg.; CNC GoogleMaps • 1 ♂; Nutak ; [ 57.466° N, 61.866° W]; 24 Jul. 1954; E.E. Sterns leg.; CNC GoogleMaps . – Northwest Territories • ♂; Exmouth Lake , M.T.S. Gravity Survey Camp; 65°02′ N, 115°54′ W; 22 Aug. 1966; G.E. Shewell leg.; CNC GoogleMaps .

CZECH REPUBLIC • 1 ♂; Carlsbad; 24 Aug. [19]15; Oldenberg leg.; USNM .

USA – New Hampshire • 1 ♂; White Mtns ; [ 44°16′16″ N, 71°18′18″ W]; Morrison leg.; USNM GoogleMaps • 1 ♂; Mt Washington; [ 44°16′13″ N, 71°18′11″ W]; 3500 m a.s.l.; 23 Aug. 1988; J.M. Cumming leg.; stream bed; CNC GoogleMaps . – Colorado • 1 ♀; Loveland Pass ; [ 39.663° N, 105.879° W]; 12000 ft a.s.l.; 7 Aug. 1961; J.G. Chillcott leg.; summit; CNC GoogleMaps .

Description

This species was thoroughly redescribed by Suwa (1986).

Distribution

This Holarctic species is presently widely disjunct in the Nearctic Region, currently recorded from New Hampshire, Labrador, British Columbia, Northwest Territories and Colorado ( Fig. 60). In the Palaearctic Region, A. nigrimana is known from Europe ( Gorodkov 1986).

Remarks

Vockeroth (1965) noted that A. nigrimana did not occur in the Nearctic Region and that previous records were confused with A. capillata . However, since that publication several Nearctic specimens have been identified as conspecific with a specimen identified as A. nigrimana from Austria (whose identification was confirmed by comparison with the type specimens by Vockeroth). This represents new verified Nearctic records for this species.