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