Callomyia

Cumming, Heather J. & Wheeler, Terry A., 2016, Revision of the Nearctic species of Callomyia Meigen (Diptera: Platypezidae) and phylogeny of the genus, Zootaxa 4111 (5), pp. 501-554 : 507-508

Key to males of Callomyia species in North America

1. Abdomen with yellow or brownish-yellow markings; if silver-blue markings present, restricted to tergite 5............... 2

- Abdomen dark brown to black, without yellow or brownish-yellow markings; silver-grey, silver bluish-grey, silver-blue or metallic bluish-white markings usually present.............................................................. 4

2. Yellow markings on abdomen more brownish-yellow ( Figs 9 , 19 ); tergite 5 without silver-blue markings; hind tarsomere 1 long and narrow, slightly narrower than apical width of hind tibia; hypandrial process with long finger-like basoventral lobe ( Fig. 59 ).................................................................................. C. calla Kessel

- Yellow markings on abdomen yellow to bright yellow ( Figs 7 , 14 , 8 , 24 ); tergite 5 usually with lateral to anterolateral silverblue markings ( Figs 7 , 14 ); hind tarsomere 1 thicker, subequal to or slightly broader than apical width of hind tibia; hypandrial process with shorter basoventral lobe ( Figs 58 , 64 )........................................................... 3

3. Lemon yellow markings on abdominal tergites 1–4 ( Figs 7 , 18 ); sternite 8 yellow; hind tarsomere 1 length approximately 2X width, slightly broader than apical width of hind tibia; molar-like surstylus in posterior view with ventral inner cusp broadly truncate medially ( Fig. 66 )........................................................ C. browni Cumming sp. nov.

- Yellow markings only on abdominal tergites 1–3 ( Figs 14 , 24 ), sometimes only on tergites 1–2; sternite 8 brown to grey; hind tarsomere 1 length approximately 2.5X width, subequal to apical width of hind tibia; molar-like surstylus in posterior view with ventral inner cusp more narrowly truncate medially ( Fig. 69 ).................................. C. venusta Snow

4. Thorax partially dark brown to black with distinct metallic bluish-white or silver-blue markings on lateral portion of presutural scutum and most of postsutural scutum ( Figs 5, 8 , 16, 17 ); abdominal markings more blue, either metallic bluish-white or silver-blue ( Figs 5, 6, 8 ).................................................................................. 5

- Thorax mainly dark brown to black, sometimes with silver-grey dusting on scutum ( Figs 15 , 20–23 ); abdominal markings more silvery, either silver-grey or silver bluish-grey ( Figs 4 , 10–13 ) (indistinct in some specimens)..................... 6

5. Metallic bluish-white markings on abdominal tergites 1–4 and 6 ( Figs 5, 6 ); legs mainly brown ( Fig. 5 ); halter dark brown; surstylus broadly lamellate with narrow ventral process, hypandrial process trifid ( Fig. 56 )...... C. arnaudi Cumming sp. nov.

- Silver-blue markings only on abdominal tergites 1–4 ( Fig. 8 ); legs mainly pale yellow with hind leg darker ( Figs 8 , 17 ); halter yellowish-orange; surstylus bifid with long outer and inner processes, hypandrial process bifid ( Fig. 57 )..... C. bertae Kessel

6. Abdomen primarily dark brown to black with silver-grey markings (when present) restricted to tergites 1 and 2 or tergites 3 and 4 ( Figs 12, 13 )..................................................................................... 7

- Abdomen partially dark brown to black with more extensive silver-grey or silver bluish-grey markings on at least tergites 1–5 ( Figs 4 , 10, 11 )........................................................................................ 8

7. Mid tibia with median anterodorsal seta usually present above median dorsal seta ( Fig. 49 ); abdomen usually with posterolateral to posteroventral silver-grey markings on tergites 3 and 4 ( Fig. 12 ); surstylus bifid with long outer and inner processes, hypandrial process bifid ( Fig. 62 )......................................................... C. proxima Johnson

- Mid tibia with median anterodorsal seta absent, only median dorsal seta present ( Fig. 50 ); abdomen with lateral silver-grey dusting on tergites 1 and 2 (rarely absent), sometimes extending to tergites 3 and 4 ( Fig. 13 ); surstylus molar-like, hypandrial process trifid ( Fig. 63 )................................................................... C. velutina Johnson

8. Wing clear ( Fig. 47 ); base of hind femur with strong stout posteroventral seta ( Fig. 53 ); surstylus molar-like ( Fig. 55 )................................................................................... C. argentea Cumming sp. nov.

- Wing yellowish-brown tinted ( Fig. 48 ); base of hind femur with long thin posteroventral seta ( Fig. 54 ); surstylus broadly lamellate with narrow ventral process ( Figs 60, 61 )........................................................... 9

9. Halter brown to dark brown; silver markings on abdomen silver-grey ( Fig. 11 ); antenna with first flagellomere elongate-conical ( Fig. 42 ); scutum with 7–8 notopleural setae; mid tibia with median anterodorsal seta absent, only median dorsal seta present (see Fig. 50 ); hypandrial process trifid, with 2 apical projections and 1 basoventral lobe ( Fig. 61 ); epandrial apical process elongate and pointed ( Fig. 61 ); epandrial ventral lobe short and broad ( Fig. 61 )................... C. gilloglyorum Kessel

- Halter orange; silver markings on abdomen more silver bluish-grey ( Fig. 10 ); antenna with first flagellomere short-oval (see Fig. 41 ); scutum with 6 notopleural setae; mid tibia with median anterodorsal seta usually present above median dorsal seta (see Fig. 49 ); hypandrial process simple, without projections ( Fig. 60 ); epandrial apical process short and broad ( Fig. 60 ); epandrial ventral lobe long and narrow, curved posteriorly ( Fig. 60 )................................ C. corvina Kessel

Figures

FIGURES 9 − 14. Callomyia males, lateral view. 9. C. calla. 10. C. corvina. 11. C. gilloglyorum. 12. C. proxima. 13. C. velutina. 14. C. venusta.

FIGURES 19 − 24. Callomyia males, dorsal view. 19. C. calla. 20. C. corvina. 21. C. gilloglyorum. 22. C. proxima. 23. C. velutina. 24. C. venusta.

FIGURES 59 − 62. Callomyia male terminalia, lateral view. 59. C. calla. 60. C. corvina. 61. C. gilloglyorum. 62. C. proxima. Scale bar = 0.1 mm.

FIGURES 4 − 8. Callomyia males, lateral view. 4. C. argentea. 5. C. arnaudi (abdomen removed). 6. C. arnaudi abdomen in glycerin (coloured markings more metallic bluish-white than depicted). 7. C. browni. 8. C. bertae.

FIGURES 55 − 58. Callomyia male terminalia, lateral view. 55. C. argentea. 56. C. arnaudi. 57. C. bertae. 58. C. browni. Abbreviations: ap prj—apical projection; bv lb—basoventral lobe; cerc—cercus; d lb—dorsal lobe; d o csp—dorsal outer cusp; d prj—dorsal projection; epand—epandrium; epand ap proc—epandrial apical process; epand v lb—epandrial ventral lobe; hypd—hypandrium; hypd proc—hypandrial process; i proc—inner process; o proc—outer process; pgt—postgonite; phphallus; sur—surstylus; v i csp—ventral inner cusp; v prj—ventral projection; v proc—ventral process. Scale bar = 0.1 mm.

FIGURES 63 − 69. Callomyia male terminalia, lateral view (63 − 64); surstyli, posterior view (65 − 69). 63. C. velutina. 64. C. venusta. 65. C. argentea. 66. C. browni. 67. C. calla. 68. C. velutina. 69. C. venusta. Abbreviations: d o csp—dorsal outer cusp; v i csp—ventral inner cusp. Scale bar: Figs 63 − 64 = 0.1 mm; Figs 65 − 69 = 0.05 mm.

FIGURES 15 − 18. Callomyia males, dorsal view. 15. C. argentea. 16. C. arnaudi (abdomen removed). 17. C. bertae. 18. C. browni.

FIGURES 49 − 54. Callomyia legs. 49. C. proxima, male mid leg (with tibial setae). 50. C. velutina, male mid leg (with tibial seta). 51. C. proxima, female mid leg (with tibial seta). 52. C. velutina, female mid leg (with tibial seta). 53. C. argentea, male hind leg (with femoral seta). 54. C. corvina, male hind leg (with femoral seta). Abbreviations: ad s—anterodorsal seta; d sdorsal seta; pv s—posteroventral seta.

FIGURES 45 − 48. Callomyia thoracic bristles and wings. 45. C. velutina, female (scutum with 3 presutural intra-alar setae). 46. C. venusta, female (scutum with 2 presutural intra-alar setae). 47. C. argentea, male wing. 48. C. corvina, male wing.

FIGURES 41 − 44. Callomyia antennae. 41. C. calla, male antenna (first flagellomere short-oval). 42. C. gilloglyorum, male antenna (first flagellomere elongate-conical). 43. C. venusta, female antenna (first flagellomere short-oval). 44. C. gilloglyorum, female antenna (first flagellomere subtriangular).