Calyxochaetus cilifemoratus

Runyon, Justin B., 2024, Revision of the genus Calyxochaetus Bigot (Diptera: Dolichopodidae: Sympycninae), Zootaxa 5539 (1), pp. 1-74 : 17

Calyxochaetus cilifemoratus species group

Diagnosis. The C. cilifemoratus species group is defined by males having fore tarsomere 1 very short (as in Fig. 41 ) and mid tarsus slender with tarsomere 2 having the basal one-third to one-half slightly swollen (in dorsal or ventral view) and bearing 3–4 fine sinuous anterior setae (as in Figs 45, 47–49 ). Males also have the mid tarsomere 1 with 1–2 fine sinuous anterior setae at apex and mid tarsomere 4 usually with a fine sinuous anterior seta at apex. This group includes the only species of Calyxochaetus with a posterior preapical seta on the hind femur ( Fig. 54 , males and females). Females have a relatively wide face that is wider than postpedicel width. Scutellum without distinct blue-violet reflections.

Remarks. Species in this group primarily occur in the shade of grasses, sedges, rushes and shrubs in otherwise open, moist habitats and I have collected specimens by sweeping the net close to ground between or through vegetation. The species of Calyxochaetus that occur at high elevations in western North America are found in this group.

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.