Comprehensive Description

provided by Smithsonian Contributions to Zoology
Cyamops nebulosus Melander

Cyamops nebulosus Melander, 1913:292.—Sturtevant, 1954:558 [revision].—Sabrosky, 1958:170 [revision]; 1965:820 [Nearctic catalog].—Teskey, 1987:893 [figure of head].

DESCRIPTION.—Length of 2.0–2.50 mm; wing length 1.90–2.20 mm; wing width 0.70–0.85 mm. Adult length 1.95–2.75 mm; wing length 2.10–2.60 mm; wing width 0.76–1.05 mm.

Head: Ocellar tubercle slightly microtomentose, shiny; mesofrons subshiny to dull microtomentose, not so deep as in C. halteratus, bearing a small polished area laterad of lateral ocellus; antenna mostly yellow, with apical half and apex of 1st flagellomere slightly infuscate to brown; antenna of some specimens entirely brown; facial region mostly yellow to light brown; posterior – of gena light brown to brown; labellum and palpus mostly white to pale yellow; face in profile shallowly and vertically arched, not angulate; facial carina shallow and narrow; eye sparsely microsetulose. Chaetotaxy: Fronto-orbital setae nearly parallel; arista with 11–12 dorsal/3 ventral rays; peristomal setae 8–10.

Thorax: Anepisternum, anepimeron, and katepisternum partially polished in some specimens; halter white, mostly brown at base; mesonotum slightly longer than wide; scutellum conical, disc shallowly convex. Chaetotaxy: Dorsocentral setae 0+1, subequal in length to scutellar setae; mesonotal setulae small and weak; scutellar seta 2 pairs, basal pair about length of apical; anepisternum bare posteriorly. Legs (Figure 20): Mostly yellow; fore coxa pale yellow, whitish microtomentose and sometimes infuscate at base; fore femur sometimes infuscate anteriorly; mid coxa brown at dorsal , gray microtomentose; mid femur slightly infuscate to brown at apical –, but completely yellow in some specimens; hind femur slightly infuscate to brown at apical –; apical and sometimes subapical tarsomeres of each leg brown; spine-like setae 8–9, black, easy to discern. Wing (Figure 24): Mostly hyaline but with brown infuscation at center (over crossveins r-m and dm-cu, from costal vein margin to along vein CuA1 to its apex posteriorly) and at apex (coloration sometimes faint and difficult to discern); vein R2+3 sinuous, narrowing cell r2+3 about midlength; costal vein ratio I:2.60 (slide-mounted wing); costal vein ratio II: 3.0–3.5 (slide-mounted wing 3.2); wing ratio: 2.7–2.9 (slide-mounted wing 2.70).

Abdomen (Figures 13–16): Epandrium polished centrally. Terminalia of (Figures 14, 15): As described for C. halteratus; for more information see Griffiths (1972).

Female: Head: Mesofacialia light brown to dark brown, centrally shiny on lower of median carina; gena mostly yellow to brownish; palpus yellowish to brown. Abdomen and terminalia (Figures 17–19): As described for C. halteratus.

TYPE MATERIAL.—The holotype female is labeled “Woods Hole 7-7-2 [7 Jul 1902] Mass[achusetts]/TYPE Cyamops nebulosa Mel. [red]/ALMelander Collection 1961 [right third stippled green]/Cyamops nebulosa Typ. Mel. [handwritten, black submargin]. The holotype is double mounted (pin in rectangular card), is in good condition, and is deposited in the USNM.

OTHER SPECIMENS EXAMINED.—CANADA. New Brunswick. Kouchibouguac National Park, 2 Jul 1977, J.R. Vockeroth (1; CNC); St. Andrews, 20 Jul 1978, S.A. Marshall (1; UGE). Nova Scotia. Lockeport, 25 Jul–1 Aug 1958, J.R. Vockeroth (2, 3; CNC). Ontario. Guelph, 12 Jul 1974, R.E. Roughley (1; UGE); London, 12 Aug 1967, W.W. Judd (1; CNC). Quebec. Knowlton Lodge, 17–18 Jul 1968, J.R. Vockeroth (6,3; CNC).

UNITED STATES. Connecticut. Windham Co., Putnam Park, 22 Jul 1939, A.L. Melander (1; USNM). Florida. Alachua Co., Chantilly Acres (Malaise trap), 25 Apr 1970, W.W. Wirth (1; USNM); Gainesville, 27 Apr 1970, W.W. Wirth (1; USNM). Calhoun Co., Torreja State Park, 30 Apr 1973, G.C. Steyskal (1, 3; USNM). Highlands Co., Archbold Biological Station, 15–16 Apr 1989, A.L. Norrbom (2;USNM); Highlands Hammock State Park, 20 Mar–17 Apr 1955, 1989, F.W Mead, J.R. Vockeroth (2;CNC, USNM); Sebring, Highlands Hammock State Park, 15 Apr 1970, W.W. Wirth (15, 3; USNM). Orange Co., Rock Springs, 21 Apr 1970, W.W. Wirth (1, 3; USNM). Georgia. Ware Co., Waycross, 8 May 1911 (1;ANSP). Indiana. Tippecanoe Co., La Fayette, 16 Jun 1916, J.M. Aldrich (1; USNM). Maryland. Dorchester Co., Lloyds, 10 Jul 1907, H.S. Barber (1, ; USNM). Prince Georges Co., Beltsville, 4 Jul 1916, W.L. McAtee (1; USNM). Massachusetts. Barnstable Co., Woods Hole, 4 May–29 Aug 1946, 1950, 1952, A.H. Sturtevant (9, 13; USNM). Middlesex Co., Bedford (swamp), 20 Jul 1961, W.W. Wirth (10, 13; USNM); Concord (fern pond, marshy pond), 22–27 Jul 1961, W.W. Wirth (5, 6; USNM). Plymouth Co., Rochester, 21 Jul 1950, A.H. Sturtevant (1, 1; USNM). New Jersey. Highway 539 (4 mi (= 6.4 km) N Highway 72; in cedar bog), 15 Jun 1985, B.V. Brown (1; UGE). North Carolina. Brunswick Co., Southport, 5 Jun 1948, C.W. Sabrosky (1; USNM). Jackson Co., Dulaney Bog (7 mi (= 11.2 km) S Cashiers, Malaise trap), 19 Jun 1986, W.W. Wirth (1, 3; USNM). Macon Co., Highlands, 29 Jun 1957, W.R.M. Mason (1; CNC); Highlands Lake Ravenel (Malaise trap), 14–15 Jun 1986, W.W. Wirth (3; USNM). New York. Clinton Co., Saranac, 17 Jul 1952, W.A. McDonald (2; USNM). Pennsylvania. Bradford Co., Le Roy (2 mi (= 3.2 km) S), 10 Aug 1981, G.C. Steyskal (1; USNM). Virginia. Alexandria (Osmundo bog, reared from puparia), 30 May 1951, W.W. Wirth (1, lex; USNM). Fairfax Co., Dead Run 25 Jul 1915, R.C. Shannon (1;USNM); Falls Church, 15 Jul 1954, W.W. Wirth (1, 1; USNM). Norfolk Co., Lake Drummond, 8–11 Jun 1905, H.S. Barber (1, 1; USNM). West Virginia. Pocahontas Co., Cranberry Glades, 16 Jul 1955, C.W. Sabrosky (15, 15; USNM).

DISTRIBUTION (Figure 21).—Nearctic: Canada (ON, NB, NS, QB), USA (CT, FL, GA, IN, MD, MA, NC, NJ, NY, PA, VA, WV).
bibliographic citation
Baptista, A. and Mathis, Wayne Neilsen. 1994. "A Revision of the New World Cyamops Melander (Diptera: Periscelididae)." Smithsonian Contributions to Zoology. 1-24. https://doi.org/10.5479/si.00810282.563