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Key to the genera of the Nearctic Stenopogoninae & Dioctriinae (part.)

Fritz GELLER-GRIMM & Jorge N. ARTIGAS

2003/2004

Stenopogoninae & Dioctriinae (part.)

References: Artigas, J.N. & Papavero, N. (1991): The American genera of Asilidae (Diptera): Keys for identification with an atlas of female spermathecae and other morphological details. VII.1. Subfamily Stenopogoninae Hull. A preliminary classification into tribes. - Gayana. Zoologia. Universidad de Concepcion, Instituto Central de Biologia 55(2): 139-144; Concepcion. Artigas, J.N. & Papavero, N. (1993): The American genera of Asilidae (Diptera): Keys for identification with an atlas of female spermathecae and other morphological details. VII.6. Subfamily Stenopogoninae Hull - tribes Phellini, Pleiommatiini, Stenopogonini and Willistoninini. - Gayana. Zoologia. Universidad de Concepcion, Instituto Central de Biologia 57(2): 309-321; Concepcion. Artigas, J.N. & Papavero, N. (1991): The American genera of Asilidae (Diptera): Keys for identification with an atlas of female spermathecae and other morphological details. VII.2. Subfamily Stenopogoninae Hull - Tribes Acronychini, Bathypogonini (with description of a new genus) and Ceraturgini. - Gayana. Zoologia. Universidad de Concepcion, Instituto Central de Biologia 55(3): 247-255; Concepcion. Artigas, J.N. & Papavero, N. (1991): The American genera of Asilidae (Diptera): Keys for identification with an atlas of female spermathecae and other morphological details. VII.7. Subfamily Stenopogoninae Hull. - Tribe Cyrtopogonini with descriptions of four new genera and one new species. - Boletin de la Sociedad de Biologia de Concepcion 62: 55-81; Concepcion. Artigas, J.N. & Papavero, N. (1991): The American genera of Asilidae (Diptera): Keys for identification with an atlas of female spermathecae and other morphological details. VII.4. Subfamily Stenopogoninae Hull - Tribe Enigmomorphini, with descriptions of three new genera and species. - Boletin de la Sociedad de Biologia de Concepcion 62: 27-53; Concepcion.

1. Face extremely narrow. Head, in frontal view, clearly circular and notoriously narrower than thorax . . . . . Stenopogonini »2
- Face normally wider (if somewhat narrow, then triangular, as in Plesiommatini) and head never circular and narrower than thorax. »4

2. Katatergite without hairs or bristles . . . . . Stenopogon Loew, 1847     
- Katatergite with hairs, bristles or both. »3

3. First flagellomere less than 1.75 times combined length of scape and pedicel together; scape 1 - 1.5 times length of pedicel; second and third flagellomeres forming an apically pointed stylus, with a short spine at apex. Wing usually hyaline. Two or more anterior dorsocentral bristles . . . . . Scleropogon Loew, 1866     
- First flagellomere two or more times combined length of scape and pedicel together; scape twice or more as long as pedicel; second and third flagellomeres absent, or, if present, truncate at apex, with spine arising from pit. Wing usually brown. No anterior dorsocentral bristles . . . . . Ospriocerus Loew, 1866  

4. Antenna with 3 flagellomeres. »5
- Antenna with 1 or 2 flagellomeres. »21

5. Antennal style very robust, pubescent, as wide as or wider than first flagellomere . . . . . Ceraturgini »6
- Antennal style never as above. »7

6. Apex of first flagellomere and a second flagellomere with deep clefts, in which is recieved the attachment of the next succeeding segment . . . . . Myelaphus Bigot, 1882     
- Antennae never as above . . . . . Ceraturgus Wiedemann, 1824  

7. Face, in frontal view, distinctly triangular . . . . . Plesiommatini: Plesiomma Macquart, 1838     
- Face never triangular in frontal view . . . . . Cyrtopogonini »8

8. Face flat or very evenly rounded. »9
- Face decidedly gibbose or sometimes (Sintoria) higher near antennae. »15

9. Hairs normally dense, plumose, crinkly, on head, thorax and abdomen. »10
- Hairs never plumose, even if very dense. »11

10. Hind tibiae much enlarged, as thick as or thicker than hind femur. CuA2 and A1 joined bedore wing margin, i.e., anal cell closed, with short pedicel . . . . . Holopogon Loew, 1847     
- Hind tibiae more slender, thinner than femur. Anal cell open . . . . . Heteropogon Loew, 1847 [cf. Pycnopogon]  

11. Disc of scutellum without fine, semierected pile, at most micropubescent. »12
- Disc of scutellum with a variable number of fine, semierected pile. »14

12. Midtibia with a pair of moderately strong, black, ventral bristles at apex, directed approximately at an angle of 60 - 90º . . . . . Callinicus Loew, 1872     
- Midtibia with 3 - 5 bristles directed distally. »13

13. Pulvilli absent . . . . . Ablautus Loew, 1866     
- Pulvilli present . . . . . Itolia Wilcox, 1936  

14. Face and frons narrow, lower face in anterior view narrower than width of an eye. Mystax with dense patch of short bristles in middle of lower margin and longer, less densely spaced bristles on remainder of face. Small black flies with sparse pollinosity on thorax and shining abdomen . . . . . Hadrokolos Martin, 1959     
- Face widening below, lower face slightly wider than inferior with of an eye. Mystax not as above. Densely white-grey pollinose flies (including abdomen) . . . . . Wilcoxia James, 1941  

15. Thorax more or less flat, without mane. »16
- Thorax strongly arched, with a conspicuous mane of hairs and bristles, at least on posterior half. »20

16. Disc of scutellum bare (at lest at center), margin with 2 -3 pairs of strong bristles . . . . . Nannocyrtopogon Wilcox & Martin, 1936     
- Disc of scutellum, at least in part, with sparse to dense hairs or bristles. »17

17. Black flies with metallic blue or green shine. Hind tibia twice diameter of fore and middle tibiae. Fore tibia sharply tapering apically. Mesonotal declivity with long pile. Scutellum with semierect pile . . . . . Sintoria Hull, 1962     
- Flies not metallic colored. Hind tibia not more than 1.5 times diameter of fore and middle tibiae. Fore tibia only slightly tapered apically. Scutellum with strong marginal bristles and pile on disc either sparse or dense. »18

18. Middle tibia at apex with only two strong bristles. Tergites 3 - 5 with pollinose markings on the anterior margin but not laterally, and on the lateroposterior corners but not dorsally. Scutellar disc with sparse pile; long marginal scutellar bristles present. Pedicel with 2 and scape with 1 noticeable strong bristle . . . . . Backomyia Wilcox & Martin, 1957     
- Middle tibia at apex with a comb of about 5 strong black spines. Abdomen totally pollinose or either one margin or both anetrior margins of tergites pollinose. »19

19. Weak dorsocentral and acrostical bristles on mesonotal declivity. Mesonotum with strong lateral bristles and slightly prominent short bristles covering most of the thoracic dorsum. Face moderately gibbose to the antennae. Large (over 20 mm) vespid mimics, abdomen predomiantly striped and banded with yellow . . . . . Pritchardomyia Wilcox, 1965     
- Thoracic vestiture pile-like, except lateral bristles, some species almost bare on thorax. Face more strongly gibbose almost to the antennae. Flies not marked at abdomen. Length under 20 mm . . . . . Cyrtopogon Loew, 1847  

20. Scutellum with sparse short to long pile on disc, two strong long bristles at margin. Vein R3 (reactivation of field of R3) present as a stump vein. Face produced at lower margin, triangular in profile . . . . . Metapogon Coquillett, 1904     
- Scutellar disc with dense long wrinkly hairs and long slender marginal bristles. Vein R3 stump absent. Face strongly produced in profile . . . . . Eucyrtopogon Curran, 1923  

21. Veins CuA1 and M3 fused before wing margin (i.e. m3 closed and petiolate). First flagellomere normally with small bristles on lower dorsal surface . . . . . Enigmomorphini »22
- Veins CuA1 and M3 ending separately at wing margin (i.e. m3 open), if cell m3 isclosed, veins CUA1 and M3 meet only at wing margin. First flagellomere normally without small bristles on lower dorsal surface. »25

22. Anatergite with bristles, bristly pile, or both. Wing venation as figured . . . . . Microstylum Macquart, 1838     
- Anatergite bare. Wing venation never as above. »23

23. Face gibbose. Mystax occupying lower 2/3 of face and more . . . . . Prolepsis Walker, 1851     
- Face flat, concave, evenly rounded, or gradually sloping from base of antennae to oral margin, but never gibbose. Mystax generally thin, confined to oral margin. »24

24. Face moderately rounded from base of antennae to oral margin. Generally very robust flies, with thick and robust legs. [Pulvilli and empodium absent. Claws extremely developed, very long and slender] . . . . . Dicranus Loew, 1851     
- Face flat. Slender flies, with long and slender legs . . . . . . Archilestris Loew, 1874  

25. Face extremely narrow, the antennal sockets occupying the full width of face. Frons and vertex greatly expanded, Stichopogon-like. First flagellomere ovoid, 1.5 - 2 times width of pedicel. Mystax compact, restricted to oral margin. Two to four postsutural dorsocentral bristles . . . . . Willistoninini: Willistonina Back, 1909     
- Face never as above. Other combinations of characters »26

26. Second flagellomere sometimes fused to first flagellomere or second flagellomere entirely absent . . . . . Tillobromini: Coleomyia Wilcox & Martin, 1935     
- Second flagellomere transverse, spoon-shaped, thick and hairy . . . . . Dioctriinae ff.

 

 

 

Contents: © Jorge N. Artigas et al., Fritz Geller-Grimm, 2003
Layout & images: © Fritz Geller-Grimm, 2003