Calyxochaetus luteipes (Van Duzee)

Runyon, Justin B., 2024, Revision of the genus Calyxochaetus Bigot (Diptera: Dolichopodidae: Sympycninae), Zootaxa 5539 (1), pp. 1-74 : 34-35

Calyxochaetus luteipes (Van Duzee)

( Figs 37 , 53 , 62 , 76 )

Nothosympycnus luteipes Van Duzee, 1923: 63 .

Nothosympycnus tarsalis Curran, 1924: 108 ; synonymized by Van Duzee (1930: 57).

Calyxochaetus luteipes : Foote et al. (1965: 528).

Type material examined. Nothosympycnus luteipes : HOLOTYPE ♂, labeled: “Bar Harbor/ 3 VII 22 Me”; “C.W. Johnson/ Collector”; “ Nothosympycnus / luteipes / Holotype.VanDuzee”; “ HOLOTYPE / No. [red label]”; “M.C.Z./ Type/ 26951 [red label]” (MCZ) [photos examined].

Nothosympycnus tarsalis : HOLOTYPE ♂, labeled: “ Holotype / Nothosympycnus tarsalis / CNC No 629 Curr.”; “Orillia Ont/ 15-VIII-1923 / C.H. Curran ” (CNC).

Other material examined. CANADA: Ontario: Ottawa, 19.vii.1954, W.R.M. Mason (1♂, CNC); same data except, 17.vii.1955, J.G. Chillcott (1♂, 1♀, CNC); same data except, 26.vii.1955, J.R. Vockeroth (1♂, CNC); Whiskey Bay , 24.vii.1988, RLH (1♂, MTEC); same data except, 6.viii.1991 (4♂, MTEC) . New Brunswick: St. Andrews , 8.viii.1957, G.E. Shewell (1♂, CNC) . Nova Scotia: Lockeport, 18.vii.1958, J.R. Vockeroth (3♂, 4♀, CNC); same data except, 11.viii.1958 (3♂, 3♀, CNC); Bay Saint Lawrence , PH920077, 10.vii.1974, dry marsh with very mixed vegetation, J.R. Vockeroth (1♂, 1♀, CNC) . Quebec: Knowlton Lodge , 18.vii.1968, J.R. Vockeroth (1♂, CNC) . USA: Connecticut: Litchfield County: Lake Waramaug , 23.vii.1923, ALM (2♂, USNM) . Massachusetts: Berkshire County: Cady Brook, 3 mi. S Hinsdale, 1850 ft, N42°23.93′ W73°09.05′, 30.vi.2008, JBR (1♂, MTEC); same data except, Dalton , The Boulders , N42°28.69′ W73°10.98′, 6.vii.2008 (2♂, MTEC); Worcester County : Petersham , vii.1926, ALM (3♂, USNM) . Maine: Hancock County: Acadia National Park, 2.viii.1972, FCH (3♂, FSCA); Waldo County : Belfast , 2.viii.1972, FCH (1♂, 1♀, FSCA) . Michigan: Alger County: Munising, 28.vii.1974, FCH (2♂, FSCA); same data except, Wagner Falls , 8.viii.1993, RLH (2♀, MTEC); Houghton County : Sidnaw , 27.vii.1974, FCH (1♂, FSCA); Otsego County : 4 mi. N Gaylord, 31.vii.1992, RLH (3♂, 9♀, MTEC) . New Hampshire: Belknap County: 0.25 mi NE Tilton, N43°26.823′ W71°35.094′, 16.vii.2007, JBR (1♂, MTEC); Sullivan County : Knight Brook , 1 mi. NW Marlow Junction, 24.vii.1991, RLH (1♂, 2♀, MTEC) . New York: Essex County: Keene Valley, 1200 ft, 20.vii.1962, J.R. Vockeroth (9♂, 2♀, CNC); same data except, J.G. Chillcott (2♂, CNC); Monroe County : Rochester , 29.vii.1972, FCH (1♂, FSCA); Sullivan County : Fir Brook , 1 mi. NE Willowemoc, 22.vii.1991, RLH (1♂, MTEC) . Vermont: Addison County: Pleiad Lake, 2200 ft, 20.vii.2003, JBR (4♂, MTEC); Orleans County , Jay Peak , 3000–3400 ft, 20.vii.1968, J.R. Vockeroth (1♂, CNC) .

Diagnosis. This is the only species in the C. cilifemoratus group with an unmodified arista-like stylus ( Fig. 37 ) and the only species in the group that occurs in eastern North America.

Redescription. Male. Wing length 2.2–2.3 mm. Head: Frons with large glabrous shiny blue-violet spot on either side of ocellar tubercle. Face silver-white, narrowly triangular, about one ommatidium wide at clypeus. Antenna ( Fig. 37 ) brown; scape laterally flattened, flared apically, subequal in length to postpedicel; postpedicel elongate oval, about 1.5X as long as wide; arista-like stylus unmodified, slender, tapered to sharp point. Palpus small, oval, brown but paler along apex. Thorax: Pleura brown with gray pruinosity, usually bluish, metapleuron partly yellow especially around posterior spiracle; metepimeron wholly yellow. Legs: Foreleg: Yellow, except tarsus brown from near apex of tarsomere 3. Tibia slender, without outstanding setae, with obvious anterior comb-like row of close-set yellow setulae at apex. Tarsomere 1 very short, about as long as wide. Tarsomere 2 slightly more than half tibia length, without long anterior setae at apex. Tarsomere 3 about two-thirds as long as tarsomere 2. Tarsomeres 4 and 5 subequal in length, each half tarsomere 3 length. Midleg: Yellow, except tarsus brown from near apex of tarsomere 1. Femur without slender, yellow ventral setae. Tarsomere 1 subequal to combined length of tarsomeres 2–5, with 2 fine sinuous yellow anterior setae at apex. Tarsomere 2 with basal half slightly swollen and bearing 3 fine sinuous yellow anterior setae. Tarsomere 4 with a fine sinuous yellow anterior seta at apex. Tarsomere 5 with 1–2 shorter, fine anterior setae. Hindleg: Yellow, except femur light brown dorsoapically, tibia light brown (sometimes yellow basally), tarsus brown. Femur ( Fig. 53 ) with anteroventral row of very short slender yellow setae, slightly increasing in length distally, with distal-most seta much longer (longer than femur width), posterior preapical seta absent. Tibia with ventral row of 4–5 fine ventral setae (slightly longer than tibia width) at base. Wing ( Fig. 62 ): Evenly tinged with brown. Anal lobe evenly expanding from base to just before apex of M 4. Posterior margin projecting just before, and indented at, apex of M 4. Distal section of M 4 about 4X longer than crossvein dm-m. Abdomen: Tergite 1 yellow-brown laterally. Tergites 2 and 3 mostly to wholly yellow. Tergite 4 usually yellow at base. Sternites yellow. Hypopygium: Postgonites with apical lobes rather narrow, apex rounded, evenly dark brown.

Female. Wing length 2.4–2.7 mm. Similar to male except as follows: Head: Most of frons glabrous shiny blue-violet. Face wide, nearly parallel-sided, slightly narrowing to clypeus, light gray. Clypeus whitish gray. Antenna with postpedicel short, wider than long, oval with slightly flattened apex. Palpus much larger, triangular, rounded apically, light brown with slight gray pruinosity, with yellow setulae and yellow to brown setae. Thorax: Proepimeron with 3–4 small white hairs. Legs: Unmodified, without specialized setae. Hind tibia yellow. Hind tarsomere 1 mostly yellow. Wing: Elongate oval with posterior margin evenly rounded. Distal section of M 4 about 3X longer than crossvein dm-m. Abdomen: Tergite 2 yellow laterally on basal half or more. Tergite 3 usually with some yellow laterally at base.

Distribution and seasonal occurrence. Known from northeastern USA and southeastern Canada ( Fig. 76 ). Adults have been collected from late June through August.

Figures

FIGURES 26–44. Male antennae (lateral view) and male forelegs of the Calyxochaetus cilifemoratus species group. 26. C. anisoaristus sp. nov. 27. C. arizonicus (Harmston), inset shows lateral view of mitten-shaped postpedicel. 28. C. brooksi sp. nov. 29. C. cilifemoratus (Van Duzee). 30. C. clavicornis (Van Duzee). 31. C. celatus sp. nov. 32. C. coloradensis sp. nov. 33. C. distortus (Van Duzee). 34. C. hardyi (Harmston & Knowlton). 35. C. harmstoni sp. nov. 36. C. isoaristus (Harmston & Knowlton). 37. C. luteipes (Van Duzee). 38. C. syilx sp. nov. 39. C. anisoaristus, anterior view. 40. C. brooksi sp. nov., posterior view. 41. C. celatus, posterior view.Arrow shows very short tarsomere 1. 42. C. cilifemoratus, posterior view. 43. C. clavicornis, anterior view. 44. C. coloradensis sp. nov., ventral view. Scale bars = 0.5 mm; arista-like styli approximately 1 mm long.

FIGURES 45–55. Male mid tarsi and male hind femora of the Calyxochaetus cilifemoratus species group. 45. C. distortus (Van Duzee), ventral view. Arrow shows swollen base with anterior setae of tarsomere 2, the diagnostic character for males of the C. cilifemoratus species group. 46. C. harmstoni sp. nov., posterior view. Note: swollen base and setae on tarsomere 2 not visible. 47. C. coloradensis sp. nov., apex of tarsomere 1 and tarsomere 2, ventral view. 48. C. isoaristus (Harmston & Knowlton), apex of tarsomere 1 and 2, ventral view. 49. C. celatus sp. nov., ventral view. 50. C. arizonicus (Harmston), anterior view. 51. C. distortus, anterior view. 52. C. hardyi (Harmston & Knowlton), anterior view. 53. C. luteipes (Van Duzee), anterior view. 54. C. distortus, dorsal view. 55. C. celatus, dorsal view. Scale bars = 0.5 mm, except figs 47, 48 = 0.25 mm.

FIGURES 56–63. Male wings of the Calyxochaetus cilifemoratus species group. 56. C. arizonicus (Harmston). 57. C. celatus sp. nov. 58. C. hardyi (Harmston & Knowlton). 59. C. cilifemoratus (Van Duzee). 60. C. isoaristus (Harmston & Knowlton). 61. C. distortus (Van Duzee). 62. C. luteipes (Van Duzee). 63. C. harmstoni sp. nov. Scale bars = 1.0 mm.

FIGURES 74–76. Known geographical distributions of species in the Calyxochaetus cilifemoratus group. 74. C. distortus (Van Duzee) and C. brooksi sp. nov. 75. C. isoaristus (Harmston & Knowlton). 76. C. luteipes (Van Duzee).