Dolichopus sincerus Melander, 1900

(Figs 13–15, 18, 19)

Dolichopus sincerus Melander, 1900: 3 .

Dolichopus subdirectus Van Duzee, 1921: 118 .

Dolichopus frosti Runyon, 2008: 370, syn. nov.

Nematode. Apparent Mermithidae .

Demasculinized males examined. 4 ♂ (including holotype of Dolichopus frosti), USA, Pennsylvania, Centre County, Black Moshannon State Park, Moss-Hanne Trail, Shirks Run, 580 m, 23 July 2006, N 40°53.396’ W78°02.584’ , muddy trail through sphagnum bog, JB Runyon; 4 ♂, same as previous, 26 July 2007 (MTEC, PSUC, USNM) .

Remarks. Infected specimens of D. sincerus differ from normal specimens in having unusually small and incompletely rotated genitalia (cf. Figs 18, 19), a wider face with silver pruinosity (cf. Figs 13, 14), costa without or with at most indistinct enlargement at apex of R 1, abdominal sternite 2 with longer ventral hairs (similar to female), and in lacking a broad, lustrous, posterodorsal spur at apex of the hind tibia. Twenty-three normal males of D. sincerus were collected at the site with eight demasculinized male specimens.