Machimus Loew

Machimus Loew, 1849: 1 .

Species found in Wyoming: Machimus adustus, M. callidus, M. delusus, M. erythrocnemius, M. formosus, M. gilvipes, M. occidentalis, M. paropus, M. prairiensis, M. sadyates, and M. snowii .

Key to Species [adapted from Hine (1909) (as Asilus); Martin (1975)]

1 Reddish brown species; mystax reddish brown with few black bristles above; legs all reddish brown..... Machimus gilvipes

- Brown to blackish gray species; mystax with white to yellowish bristles below and few to many black bristles above; hind femora totally black, with yellowish brown to red apical band or longitudinally red and black band; tibiae yellowish brown to red..................................................................................................2

2 Wings reddish especially apex, many veins margined with hyaline areas.......................................... 3

- Wings hyaline, may be slightly clouded apex and posterior border............................................... 4

3 Tibiae yellowish brown, black at middle and apex; mystax with mostly white bristles, with few black bristles above............................................................................................. Machimus paropus

- Tibiae red with narrow basal yellowish band; mystax with white or pale yellowish bristles below and black bristles above......................................................................................... Machimus snowii

4 Mystax with white to pale yellowish bristles below and few black bristles above................................... 5

- Mystax with white to pale yellowish bristles below and black bristles above....................................... 7

5 Each femur black with a preapical reddish band and ventrally with white, weak bristles.......... Machimus erythrocnemius

- Each femur variable often with a preapical red band, the posterior side red and ventrally with numerous white to gray setae or a longitudinal row of mostly white stronger bristles.......................................................... 6

6 Dull gray-to-gray brown species; underside of each femur with numerous white to gray, long setae; tibiae mostly red with stripes on anterior side and apex dark....................................................... Machimus delusus

- Light gray species; underside of each femur with longitudinal row of mostly white bristles; tibiae red, infuscated or striped with black on anterior surface, and fore- and mid-tibiae apically black............................... Machimus prairiensis

7 Hind femora all black; mystax largely black with few white to pale yellowish bristles below; abdomen black with white border on each segment....................................................................... Machimus sadyates

- Hind femora black with apical red band or longitudinally red and black ( occidentalis may have all black hind femora); mystax with equal white to pale yellowish bristles below and black bristles above or a few black bristles above; abdomen dark brown to gray.............................................................................................. 8

8 At least 4 black scutellar bristles ( occidentalis may have 1 or 2 white bristles)......................................9

- Total scutellar bristles 2 black or brownish white........................................................... 10

9 Hind femora all black or may have red apical band.......................................... Machimus occidentalis

- Hind femora black anteriorly, then yellowish to reddish brown.................................. .. Machimus adustus

10 Legs light brown with gray area on front.................................................... Machimus formosus

- Legs darker reddish brown, black anteriorly.................................................. Machimus callidus