Curtonotum murinum, Hendel, 1913

Lindsay, Kate G., Klymko, John & Marshall, Stephen A., 2019, Revision of the Central American and Mexican species of the Curtonotum murinum species complex (Diptera: Curtonotidae), Zootaxa 4651 (3), pp. 531-554 : 537-538

Key to the males of the Central American and Mexican species in the C. murinum species complex

1 Postpronotal lobe with patch or row of four or more well-defined setulae below prominent postpronotal setae ( Fig. 12 ); gena more than half as wide as postpedicel ( Costa Rica to Venezuela)................................ C. abrelatas sp. nov.

- Postpronotal lobe without patch or row of well-defined setulae below prominent postpronotal setae, although sometimes with 3–4 thin scattered setulae ( Fig. 26 ); gena less than half as wide as postpedicel ( Mexico to Venezuela)................... 2

2 Posterior margins of abdominal tergites heavily marked, markings covering most of tergite 3 ( Fig. 51 ); arista with nine or more dorsal branches. Mexico to Costa Rica............................................................ C. notatum

- Posterior margins of abdominal tergites weakly to moderately marked, markings sparse on posterior half of tergite 3; arista with 9 or less dorsal branches ( Mexico to Venezuela)............................................................. 3

3 Male with inner lobe of surstylus very thin (10–15 times as long as wide), flat ( Fig. 36 ); distal leaf-like lobe of distiphallus sclerotized medially ( Fig. 39 ) (female unknown) ( Mexico)..................................... C. prolixum sp. nov .

- Male with inner lobe of surstylus thin (6–8 times as long as wide), wedge shaped ( Fig. 28 ); leaf-like lobe of distiphallus sclerotized on left side (female unknown) ( Mexico to Venezuela).................................................... 4

4 Male with distal leaf-like lobe of distiphallus squat, asymmetrical; lower projection at base of lobe thin, sclerotized and reflexed ( Fig. 31 ) ( Mexico to Venezuela)............................................................ C. irksum sp. nov .

- Male with distal leaf-like lobe of distiphallus elongate, symmetrical; lower projection at base of lobe squat, membranous and folded ( Fig. 46 ) ( Mexico to Belize)........................................................ C. transitus sp. nov.

Figures

FIGURES 10–13. External characters of Curtonotum abrelatas sp. nov.. 10. Habitus, lateral view ♂. 11. Head, anterior view. 12. Postpronotal lobe, lateral view. 13. Abdomen, dorsal view.

FIGURES 24–27. External characters of Curtonotum irksum sp.nov.. 24. Habitus, lateral view ♂. 25. Head, anterior view. 26. Postpronotal lobe, lateral view. 27. Abdomen, dorsal view.

FIGURES 47–51. Curtonotum notatum sp. nov.. 47. Habitus, lateral view ♂. 48. Head, anterior view. 49. Male terminalia, external left lateral view. 50. Detail of distiphallus, left lateral view. 51. Abdomen, dorsal view.

FIGURES 36–39. Curtonotum prolixum sp. nov.. 36. Male terminalia, left lateral view. 37. Same, posteroventral view. 38. Same, external left lateral view. 39. Detail of distiphallus, dorsal view.

FIGURES 28–31. Curtonotum irksum sp. nov.. 28. Male terminalia, left lateral view. 29. Same, posteroventral view. 30. Same, external left lateral view. 31. Detail of distiphallus, dorsal view.

FIGURES 43–46. Curtonotum transitus sp. nov.. 43. Male terminalia, left lateral view. 44. Same, posteroventral. 45. Same, external left lateral view. 46. Detail of distiphallus, dorsal view.