Heteropogon

Sаkhvon, Vitаl V. & Lelej, Аrkаdy S., 2018, Review of the genus Heteropogon Loew, 1847 (Diptera: Asilidae) from Russia and Central Asia, with description of two new species, Zootaxa 4486 (4), pp. 435-450 : 448-449

Key to males of the species of the genus Heteropogon from Russia and Central Asia

1. Tergites black........................................................................................ 2

- Some tergites reddish partially or completely................................................................ 3

2. Macrosetae of mystax mixed black and white, longer than proboscis length. Ocellar macrosetae mainly black, in length commonly reaching to apex of antenna. Scutum with dense long black and white setae and macrosetae. Scutellum with numerous long white apical scutellar macrosetae and usually with a few long white discal scutellar setae.......... H. filicornis (Loew)

- Mystacal setae and macrosetae mainly black. Mystax equal or shorter than length of proboscis. Ocellar setae white, equal or longer than length of scape and pedicel combined. Scutum with sparse short white and black setae. Postpronotal lobe without setae. Scutellum lacking apical scutellar macrosetae and usually lacking discal scutellar setae......... H. hiemalis sp. nov.

3. Mid tibia with a tuft of black setae in the middle............................................................. 4

- Mid tibia lacking a tuft of black setae in the middle........................................................... 7

- Pulvillus shorter than length of half of claw................................................. H. pyrinus Hermann

5. Mid tibia with white or pale dense setae not reaching tarsomere I............................................... 6

- Mid tibia with white dense setae reaching tarsomere I–II. The tuft of black setae in the middle of mid tibia equal or shorter than length of white setae. Scutum with long dense white setae and macrosetae. Scutellum with few white apical scutellar macrosetae and numerous discal scutellar setae......................................................... H. pilosus Lehr

6. Mid tibia with white dense setae and with conspicuous tuft of black setae in the middle. Scutum with short white and black setae. Scutellum with 2–4 white apical scutellar macrosetae..................................... H. ornatipes Loew

- The tuft of black setae in the middle of mid tibia equal to or shorter than length of pale setae. Scutum with dense short black setae. Scutellum with 2–4 (rarely 6) black apical scutellar macrosetae.............................. H. scoparius Loew

7. Stylus thin and long.................................................................................... 8

- Stylus wide and short, in length (without aristomere) equal to or more than half of postpedicel length....... H. ater sp. nov.

8. Macrosetae and setae of mystax white, with few dark brown macrosetae in lower facial margin in frontal view. Postocular macrosetae and setae white. Scutum with short sparse white setae, some dark brown. Scutellum lacking apical scutellar macrosetae. Fore tarsi, especially tarsomeres I–IV anterodorsally and posterodorsally with dense, comparably long white setae.......................................................................................... H. lugubris Hermann

- Mystax with only white macrosetae and setae. Postocular macrosetae white, but setae white and black. Scutum with short sparse black setae, some of them white. Scutellum with 2 long white apical scutellar macrosetae. Fore tarsi, especially tarsomeres I–IV anterodorsally and posterodorsally with white setae comparatively dense and long posterodorsally only.............................................................................................. H. mesasiaticus Lehr