Chrysotus parvulus (Aldrich)

Runyon, Justin B., 2020, The Dolichopodidae (Diptera) of Montserrat, West Indies, ZooKeys 966, pp. 57-151 : 57

Chrysotus parvulus (Aldrich)

Diaphorus parvulus Aldrich, 1896: 321.

Chrysotus longipes Van Duzee, 1927: 1.

Material examined.

Dominica: 3 ♂, 23 January-17 February 1964, H. Robinson; 1 ♂, 1 ♀, St. Mark Parish, 4 km N Soufriere, 75 m, 17-19 March 2003, E. Bentson, G. Carner; 13 ♂, Cabrits National Park, East Cabrits Trail, 15.58564N, 61.47210W, Malaise, 30 May-7 June 2011, M.A. & L.L. Ivie. Montserrat: 1 ♂, 3 ♀, Underwood Ghaut, canopy fogging at dawn, 23 May 2002, K. Marske & J. Boatswain; 1 ♂, 1 ♀, Woodlands, Riverside House, 22 July 2005, yellow pan traps, V.G. Martinson; 1 ♂, 4 ♀, Bottomless Ghaut, 5 August 2005, yellow pan trap, V.G. Martinson; 6 ♂, 4 ♀, same as previous, 14 August 2005; 2 ♂, 4 ♀, Killiekranke, 3 August 2005, yellow pan trap, V.G. Martinson; 9 ♂, 1 ♀, Big River, 5 August 2005, yellow pan traps, V.G. Martinson; 4 ♂, 6 ♀, Bottomless Ghaut trail to Big River, 14 August 2005, yellow pan traps, V.G. Martinson; 1 ♂, Cassava Ghaut, 24 June 2005, yellow pan traps, V.G. Martinson; 2 ♂, 3 ♀, Fogarty Ghaut (Soldiers), 16°46.41'N, 62°12.44'W, 21 June 2017, J.B. Runyon; 2 ♂, 3 ♀, Jack Boy Hill (top), 480 m, 16°45.797'N, 62°10.886'W, 25 June 2017, J.B. Runyon; 1 ♀, Big River, 450 m, 16°45.690'N, 62°11.174'W, 28 June 2017, J.B. Runyon; 1 ♀, Bottomless Ghaut, 400 m, 16°45.994'N, 62°11.497'W, 28 June 2017, J.B. Runyon; 1 ♂, 1 ♀, Katy Hill (top), 730 m, 16°45.731'N, 62°11.646'W, 28 June 2017, J.B. Runyon; 1 ♂, ghaut above Montserrat Volcano Observatory, 330 m, 16°45.130'N, 62°12.487'W, 27 June 2017, J.B. Runyon (MTEC, USNM).

Distribution.

Lesser Antilles and Puerto Rico.

Remarks.

This species was moved from Diaphorus to Chrysotus by Becker (1922, page 170), an act that has gone largely unnoticed. Becker’s move was correct because this species does not fit in the current definition of the genus Diaphorus (see Remarks for C. interfrons sp. nov.). In particular it lacks setae on the upper proepisternum, black calypteral setae, a completely bare tergite 6, and four to eight long strong setae on sternite 8. The species fits in the broadly defined Chrysotus following Pollet et al. (2004), which is likely paraphyletic and might need subdivision as diaphorine phylogeny is elucidated ( Capellari and Amorim 2010). This necessitates a new replacement name for the Nearctic Chysotus parvulus Van Duzee, 1924, as: