Robustagramma incurvum Cui and Marshall, 2005

Marshall, Stephen A. & Cui, Yongsheng, 2005, Systematics of Robustagramma, a new genus of New World Sphaeroceridae (Diptera), Zootaxa 1026 (1), pp. 1-122 : 59-61

Robustagramma incurvum Cui and Marshall , new species

( Figs. 150–156 )

As described for Robustagramma altifrons except as follows.

Body length 1.0– 1.5 mm, without vittae on scutum. Face, gena and antenna brown. Interfrontal bristles in 3 pairs (occasionally in 4 pairs) in addition to interfrontal setulae. Postocellar bristles absent or weak. Eye height ca. 1.8–1.9 times genal height. Arista slightly longer than head height.

Length of second costal sector of wing ca. 0.41–0.43X length of third. Discal cell with a stump vein CuA 1, ca. 1–2 vein widths long. Mid tibia of male with an apicoventral and several short, stout ventral bristles on distal third; corresponding femur with 3 or 4 ventral proximal bristles.

Male terminalia: Sternite 5 with 3 pairs of short, stout bristles on borderline. Dorsomedial length of epandrium ca. 0.3X length of sternite 8. Surstylus mostly setose; distal portion tapering in lateral view and incurved in posterior view.

Female terminalia: Tergite 10 with two small bristles and several small setulae near central area. Sternite 7 longer than sternite 6, rounded posteromedially.

Holotype (♂, DEBU) and paratypes (12 ♂, 7 ♀, DEBU): UNITED STATES: Florida. Marion Co., Ocala Natl. For., Oak Grove , mushroom trap, 8–11.vi.1984, S.A. Marshall.

Other paratypes: CANADA: Ontario, Lambton Co., Port Franks, Karner Blue Sanctuary, pans, 2–8.viii.1996, J. Skevington (1♀, DEBU). UNITED STATES: Arkansas. Madison Co., 3 mi S Brashers, 1600', mixed hardwood forest, dung, 19.vi.–12.vii.1972, A. Newton (3 ♂, DEBU). Florida. Marion Co., Ocala Natl. For., Silver Springs Woods, sandpine, Mushroom trap, 7.vi.1984, S.A. Marshall (1 ♂, DEBU). Same data as previous label, but dated 7–11.vi.1984, FIT (5 ♂, 5 ♀, DEBU); 6–22.vi.1984, FIT (1 ♂, DEBU); 10– 15.vi.1984 (2 ♂, DEBU); 11–15.vi.1984, carrion FIT (4 ♂, 2 ♀, DEBU); hardwood swamp, dung trap (1 ♂, DEBU). Marion Co., Ocala Natl. For., near Zay Prairie, carrion trap, 14–18.vi.1984, S.A. Marshall (8 ♂, 6 ♀, DEBU). Marion Co., Ocala Natl. For., Oklawaha Swamp, dung trap, 11–12.vi.1984, S.A. Marshall (2 ♂, DEBU). Alachua Co., Gainesville (Hogtown Creek), 12.x.1976, P.M. Choate & R.E. Woodruff (1 ♂, DEBU). Florida. Monticello, 10.vii.1939, Oman (1 ♂, DEBU). Georgia. Wilkinson Co., Big Sandy Ck, 8 mi S Irwinton, US 441, 5–25.vi.1984, FIT near dung (8 ♂, 1 ♀, DEBU); Wilkinson Co., Big Sandy Ck, 4 mi S Irwinton, US 441, 5–25.vi.1984, dung trap (1 ♀, DEBU); Clinch Co., 8 mi S Fargo, US 441, 5–25.v.1984, dung trap (3 ♂, 2 ♀, DEBU); Telfar Co., Little Ocmulgee St Pk near Morae, 24.vi.1984 (1 ♂, 1 ♀, DEBU), S.A. Marshall. Clarke Co., 33 54' N, 83 16' W, 15–22.vii.1992, J. Pickering (1 ♂, 2 ♀, UGCA). Kentucky. Whitly Co., D. Boone Natl. For., 4–30.vi.1984, Rhododendron­Oak, FIT (2 ♂, DEBU); Laurel Co., 15 mi W London, 4–30.vi.1984, Oak, FIT (2 ♂, 3 ♀, DEBU), S.A. Marshall. Louisiana. Grant Parish, 18 km N Alexandia, Stuartl. Camp., forest FIT, 19.v.– 17.viii.1983, S.&J. Peck (3 ♂). Massachusetts. Cape Cod, Onset Bay, 23.viii.1985, W. A. Attwater (1 ♂, DEBU). Mississippi. Pontotoc Co., 32 km SW Tupelo Tockshish, Mi 250, Oak For., FIT, 17.v–19.viii.1983, Peck (8 ♂, 3 ♀, DEBU). Lee Co., SW Tupela, FIT, 17.v– 19.viii.1983, S.&J. Peck (4 ♂, 5 ♀, DEBU). Scott Co., forest pans in prairie edge, 5– 9.v.1994, S.A. Marshall (3 ♂, 3 ♀, DEBU). Oregon. Benton Co., Marys Peak, 3000', sift rotten Douglas fir log, 17.v.1983, D.S. Chandler (2 ♂, 1 ♀, DEBU). South Carolina. Cotteton St. Pk, pig dung trap, 27, ix.– 5.x.1983, R.E. Woodruff (1 ♂, DEBU). Tennessee. Henderson Co., Natchez Trace St. Pk, 1000', dung, 18.vi–13.vii.1972, A. Newton (1 ♂, DEBU). Texas. San Jacinto Co., 5 km S Coldspring, Double Lk Camp, 22.v–16.viii.1983, forest FIT (15 ♂, 17 ♀, DEBU); 22–24.V.1983, forest carrion trap (1 ♂, DEBU); Bastrop Co., Bastrop St. Pk, 24.v–16.viii.1983, Oak­pine Ravine FIT (7 ♂, 2 ♀, DEBU); S. Patricio Co., Mathis, Nueces R. Riverine Forest, 28–30.v.1983, carrion traps (1 ♂, DEBU), S.&J. Peck. Angelina Co., Angelina Natl. For., Boykin Cemetery, Spring fen dung, 13– 17.vi.1993, S.A. Marshall (2 ♂, DEBU). Brazos Co., College Station, Lick Creek Pk., post oak savanna, pan traps, 26–30.iii.2000 (27, 16 ♀, DEBU); bottomland forest near creek, malaise trap, 26–30.iii.2000 (3 ♂, 13 ♀, DEBU), M. Buck. Montgomery Co., 10.7 mi S Montgomery, oak/pine forest, FIT, 17.v–17.vi.1987, R. Anderson (2 ♀, DEBU). Virginia. Bath Co., 9.6 km N Clifton Forge, Tsuga / Fagus Forest, FIT , 13.v–21.viii.1983, S.&J. Peck (1 ♂, DEBU).

Etymology: The specific epithet refers to the incurved distal portion of the surstylus.

Figures

FIGURES 150–156. Robustagramma incurvum sp. nov.: 150, posterior view of male terminalia; 151, lateral view of male terminalia; 152, lateral view of male internal genitalia; 153, male sternite 5; 154, dorsal view of female terminalia; 155, ventral view of female terminalia; 156, spermathecae.