Cyrtopogon Loew, 1847

Lavigne, Robert J. & Dennis, Steve, 2019, Robber flies (Insecta: Diptera: Asilidae) of Wyoming, USA with keys to genera and species, Zootaxa 4662 (1), pp. 1-126 : 62-63

Cyrtopogon Loew

Cyrtopogon Loew, 1847: 516 .

Species found in Wyoming: Cyrtopogon albifrons , albovarians , C. auratus , C. banksi , C. bimaculus , C. caesius , C. callipedilus , C. curtistylus , C. fumipennis , C. glarealis , C. hollandi sp. nov., C. infuscatus , C. inversus , C. martini sp. nov., C. montanus wilcoxi , C. platycaudus , C. plausor , C. praepes , C. pulcher , C. rufotarsus , C. sabroskyi , and C. willistoni .

Key to Species [adapted from Melander (1923b); Wilcox & Martin (1936)]

1 Scutellum convex, mostly shining, sometimes with a transverse spot of pollen at the base; in profile the face usually strongly gibbous and the antennae usually situated at about three-fourths the height of the head; more densely pilose and less pollinose species.............................................................................................. 2

- Scutellum more or less flattened and largely or entirely pollinose; in profile the face usually not so strongly gibbous and the antennae usually situated at about one-half the height of the head; less pilose and more densely pollinose species........ 16

2 Third antennal segment orange, yellowish red or red; tibiae and tarsi more or less reddish............................ 3

- Antennae wholly black................................................................................. 6

3 Male abdominal tergites 2–4 with dense tufted yellow or black pile; mystax yellow, black below or on margin............ 4

- Male abdomen without dense pile as above; mystax all or mostly black.......................................... 5

4 Abdominal segments 2–4 with tufts of yellow or golden pile; and with posterior silver pollinose bands; mystax yellow above, black below; first two antennal segments with black pile....................................... Cyrtopogon auratus

- Abdominal segment 1 sides and whole of segments 2–4 reddish-yellow pollinose; mystax yellow, with oral margin broadly black setae; first two antennal segments yellowish pollinose................................ Cyrtopogon platycaudus

5. On males, lateral setae on abdominal segment 1 long, straw white, segment 2 long, brown, segment 3 short, black...................................................................................... Cyrtopogon martini sp. nov.

- On males, lateral setae on abdominal segments 1–3 yellow to yellowish white, remaining segments black; female all lateral setae on abdominal segments yellow to yellowish white........................................ Cyrtopogon pulcher

6. Abdomen with dense, erect pile at least covering the dorsum; segment 1 reddish yellow, segments 2–4 orange............................................................................................... Cyrtopogon curtisytlus

- Abdomen without dense pile on dorsum as above............................................................ 7

7 At least the last two segments of the middle tarsi of the males with a broad disc of black setae; male fore tarsi silvery pilose above; face at the antennae subequal in width to the width of one eye, strongly gibbous.............................. 8

- Middle tarsi of the males without disc of black setae; face usually narrower than the eyes and not so strongly gibbous.... 11

8 Pad of black setae on the middle tarsi confined to the last two segments and very broad, total width of hairs about six times the width of the segments; silvery white setae on the male fore tarsi parted on all segments........... Cyrtopogon callipedilus

- Pad of black setae on the middle tarsi not much more than three times the width of the segments and not always confined to the last two joints; silvery setae on the male fore tarsi not parted on all segments...................................... 9

9 Setae of the abdomen and thorax in both sexes yellowish-white................................. Cyrtopogon plausor

- Setae of the abdomen and thorax always at least partly black in both sexes...................................... 10

10 Joints 1–5 of male fore tarsi with a narrow crest of silvery setae not noticeably expanded apically; legs entirely black; setae of the body mostly black, first two abdominal segments yellow setae; hind femora yellowish setae........ Cyrtopogon praepes

- Silvery setae on male fore tarsi confined to joints 2–5, noticeably expanded apically; tibiae and tarsi usually reddish but sometimes entirely black; usually more than the two basal abdominal segments pale setae hind femora black setae................................................................................................ Cyrtopogon willistoni

11 Wings of the male with a large apical brown cloud and a smaller cloud covering the apex of the anal cell, female wings more or less darkened in the same regions; pleura largely shining black............................... Cyrtopogon bimacula

- Wings not bimaculate; pleura more extensively pollinose..................................................... 12

12 Tibiae yellow to red or black, and tarsi pale yellow to red or reddish brown....................................... 13

- Legs black, hind tibiae sometimes dark reddish............................................................. 14

13 Meral pile entirely black; tibiae black, tarsi reddish brown.............................. Cyrtopogon montanus wilcoxi

- Meral pile white or partly white; tibiae and tarsi pale yellow to red........................... Cyrtopogon albovarians

14 Fore tarsi of males not silvery to white pilose above; fasciae of abdominal tergites 2–4 entire or nearly so.............. 15

- Male fore tarsi silvery to white pilose above; fasciae of the abdomen rather broadly interrupted on at least segments 2–6...................................................................................... Cyrtopogon rufotarsus

15 Setae on antennal segments black; mystax largely white; pile on female abdomen black.............. Cyrtopogon inversus

- Setae on antennal segments white; mystax white above, black on sides and below; pile on female abdomen white...................................................................................... Cyrtopogon hollandi sp. nov.

16 Pollinose fasciae on first abdominal segment entire......................................................... 17

- Fasciae on first abdominal segment narrowly to broadly interrupted............................................ 20

17 Bristles of tibiae largely black.......................................................................... 18

- Bristles of tibiae largely white.......................................................................... 19

18 Scutellar setae brown; haltere stem yellowish, knob rosy; mystax white........................... Cyrtopogon caesius

- Scutellar setae sparse, black; haltere stem brown, knob yellowish white; mystax black............ Cyrtopogon fumipennis

19 Scutellar setae white; haltere stem dark brown, knob yellow.................................. Cyrtopogon sabroskyi

- Scutellar setae black; haltere stem brown, know light brown.................................. Cyrtopogon infuscatus

20 Fasciae on first abdominal segment broadly interrupted, wings hyaline............................. Cyrtopogon banksi

- Fasciae on first abdominal segment narrowly interrupted, wings tinged with brown................. Cyrtopogon albifrons