provided by Smithsonian Contributions to Zoology
Cyamops halteratus Sabrosky
Cyamops halteratus Sabrosky, 1958:170; 1965:820 [Nearctic catalog].
DESCRIPTION.—Length of 1.65–1.95 mm; wing length 1.70–2.0 mm; wing width 0.60–0.80 mm. Length of 2.30–2.55 mm; wing length 2.30–2.50 mm; wing width 0.80–0.90 mm.
Head: Ocellar tubercle sparsely microtomentose; frons subshiny, moderately microtomentose, with polished area immediately laterad of lateral ocellus; mesofrons deeply concave, velvety black; antenna mostly yellow, with dorsal half and sometimes apex of 1st flagellomere brown; facial region mostly yellow; posterior of gena mostly 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: Inner fronto-orbital setae nearly parallel; fronto-orbits very sparsely setulose; arista with 9 or 10 dorsal/3 ventral rays; peristomal setae 7–9.
Thorax: Anepimeron sometimes polished anteriorly; halter mostly white to gray, mostly black at base; mesonotum slightly longer than wide; scutellum conical, disc shallowly convex. Chaetotaxy: Dorsocentral setae 0+1, subequal in length to basal scutellar seta; mesonotal setulae small; scutellar setae 2, the basal pair about length of apical; anepisternum bare. Legs: Mostly yellow; fore coxa pale yellow, with mostly white microtomentum; mid coxa brown on dorsal , whitish microtomentose; mid and hind femora brown on apical –; apical and sometimes subapical tarsomere of each leg brown; spine-like setulae 6–9, black, easy to discern. Wing (Figure 22): Completely hyaline; costal vein ratio I: 2.9 (slide-mounted wing); costal vein ratio II: 2.28–3.33 (slide-mounted wing 3.23); wing ratio: 2.55–3.03 (slide-mounted wing 2.56).
Abdomen (Figures 2, 3, 5): Epandrium polished centrally; 7th tergite a narrow band; 6th–7th sternites as in Figure 3. Terrninalia of (Figure 3): Left surstylus elongate, angulate medially; right surstylus shorter and broader than left; hypandrial process small, width less than base of left surstylus; ejaculatory apodeme (Figure 5) very large, hatchet-like; aedeagal apodeme free from hypandrium.
Female: Head: Antenna sometimes entirely brown; mesofacialia brown to dark brown, shiny on lower of median carina; palpus mostly yellow to mostly brown; median plate of clypeus sometimes polished anteriorly. Abdomen and terminalia (Figure 4, 6, 7): Boundary between 6th and 7th segments weak dorsally; 7th segment completely separate from 8th sternite; 9th tergite (= “epiproct” in J.F. McAlpine, 1981) weakly sclerotized medially; 3 spherical spermathecae.
TYPE MATERIAL.—The holotype male is labeled “Washburn Co Wis T39N R12W B32 25 VIII 1951 Coll R H Jones/HOLOTYPE Cyamops halteratas C.W. Sabrosky [pale pink]/TypeNo 64220 [red]/Cyamops halteratus SABR. det Sabrosky [black submargin].” The holotype is double mounted (glued to celluloid point), is in fair condition (left antenna missing, a hole in scutum), and is deposited in the USNM (64220).
OTHER SPECIMENS EXAMINED.—CANADA. New Brunswick. Glebe Road, Chamcook, 14 Jul 1965, G.E. Shewell (1; CNC). Newfoundland. Portugal Cove (sedge fen), 27 Jun 1987, T.A. Wheeler (1UGE). Nova Scotia. Halifax Co., Lawrencetown, 19–20 Jul 1967, D.M. Wood (1; CNC). Ontario. Ottawa, 4–12 Jul 1956, J.R. Vockeroth (1, 2 CNC); Ottawa, Mer Bleue, 23 Jun–31 Jul 1952, 1958, 1964, 1966, A.L. Melander, D.D. Munroe, G.E. Shewell, J.R. Vockeroth (3, 3; CNC, USNM); Point Pelee National Park, Leamington, 8 Jul 1980, K.N. Barber (3; UGE). Quebec. Old Chelsea, 18 Jun 1963, J.R. Vockeroth (1; CNC).
UNITED STATES. Massachusetts. Barnstable Co., Woods Hole, 28 Jun–29 Aug 1950, 1954, A.H. Sturtevant (4, 7; USNM); Mashpee, 28 Jul 1950, A.H. Sturtevant (1; USNM). Middlesex Co., Concord (marshy pond), 27 Jul 1961, W.W. Wirth (5; USNM). Plymouth Co., Rochester, 21 Jul 1950, A.H. Sturtevant (2 USNM). New Hampshire. Cheshire Co., Mt. Monadnock, 26 Jul 1926, A.L. Melander (1; USNM). Ohio. Portage Co., Kent (marsh, swept from Carex stricta Lam.), Horning Road, 2 Jul 1989, B.A. Foote (1; USNM). Utah. Rich Co., Laketown, 12 Jul 1938, G.W. Knowlton, F.C. Harmston (1; USNM). Wisconsin. Washburn Co., 6 Jul 1951, R.H. Jones (1 USNM).
DISTRIBUTION (Figure 8).—Nearctic. Canada (NB, NF, NS, ON, QB). United States (MA, NH, OH, UT, WI).
- 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