Apocleinae
Amblyonychus
Eccritosia
Furcilla
Mallophora
Megaphorus *
Nevadasilus
Proctacanthella
Proctacanthus
Promachella
Promachus
Efferia-group
Albibarbefferia
Aridefferia
Carinefferia
Efferia
Nerax
Pogonioefferia
Triorla
Tuberculefferia

Nearctic species:

1. Megaphorus acrus (Curran, 1931)
2. Megaphorus brunneus (Cole in Cole & Pritchard, 1964)
3. Megaphorus clausicellus (Macquart, 1850)
4. Megaphorus clausicellus intermedius (Tucker, 1907)
5. [Megaphorus durangoensis (Cole in Cole & Pritchard, 1964)]
6. Megaphorus flavidus (Cole in Cole & Pritchard, 1964)
7. Megaphorus frustrus (Pritchard, 1935)
8. Megaphorus guildianus (Williston, 1885)
9. Megaphorus laphroides (Wiedemann, 1828)
10. Megaphorus lascruensis (Cole in Cole & Pritchard, 1964)
11. Megaphorus martinorum (Cole in Cole & Pritchard, 1964)
12. Megaphorus megachile (Coquillett, 1893)
13. Megaphorus minutus (Macquart, 1834)
14. Megaphorus pallidus (Johnson, 1958)
15. Megaphorus prudens (Pritchard, 1935)
16. Megaphorus pulchra (Pritchard, 1935)
17. Megaphorus willistoni (Cole in Cole & Pritchard, 1964)

 
 
 
 
 
 
 
 
 

- female -

 
 

Unrecognized species: Megaphorus clausicellus intermedius (Tucker, 1907) from colorado.

	Costal vein ends in wing tip.
	Castal vein continues around wing margin to anal vein or somewhat interrupted.

	Femora black basally.
	Femora red basally, usually broadly so

	Short black pile on several of the abdominal tergites. Hind tibiae mostly black-haired (species of the southeastern states).
	Abdomen without black pile above.

	Hind tibiae with some yellow hairs at base. Length 13-14 mm . . . . . Megaphorus laphroides (Wiedemann, 1828) [KY, NC, SC, GA, AL, FL, VA, PA]
	Hind tibiae black-haired dorsally over entire length. Very small species, length 9-10 mm . . . . . Megaphorus minutus (Macquart, 1834) [PA, FL, NC, GA, SC]

	Fifth radial cell r5 closed and short petiolate to very narrowly open. Genitalia segments red (estern states) . . . . . Megaphorus clausicellus (Macquart, 1850) [VA, CO, NM, PA, NJ, FL, MD, DC, NC, SC, AL, MS, LA, AR]
	Fifth radial cell r5 wide open, no narrowing. Genitalia segments balck, silvery hairs above in male (western states) . . . . . Megaphorus megachile (Coquillett, 1893) [CA, MEX, BCF, BCS]

	Femora with ectreme base and apex red, red below on front pair. Dorsal pile giving yellow and gray cast to fly. Fifth radial cell r5 closed and petiolate. Length 12-14 mm . . . . . Megaphorus willistoni (Cole in Cole & Pritchard, 1964) [CA, OR, NV, UT, AZ, WA, , CAN, BCA, MEX]
	Femora broadly red basally. Mostly smaller species.

	Hind femora with many long, black bristly hairs below. Reddish color of legs rather dark . . . . . Megaphorus acrus (Curran, 1931) [OK, TX, KS, NM, AR, MEX]
	Hind femora with yellow or white pile below, rarely a few long black hairs.

	Fifth radial cell r5 wide open, veins thin and pale at wing margin. Bristles and hairs on scutum whitish. Male genitalia black, densely silver-haired above. Small slender species . . . . . Megaphorus pulchra (Pritchard, 1935) [NM, CA, NV, UT, AZ, NM, TX]
	Fifth radial cell r5 closed and petiolate.

	Legs wholly red, no black marks on femora. Some black hairs on frons, antennae, and posterior portion of scutum . . . . . Megaphorus lascruensis (Cole in Cole & Pritchard, 1964) [NM, TX]
	Legs with more or less black color.

	Middle tarsomeres of female yellow-haired above (some black bristles, mostly at sides).
	Middle tarsomeres of female black-haired. Species with mostly yellowish pile. Genitalia yellowish red.

	Small species, 9-10 mm long. No black hairs on frons or in mystax. Genital segments yellowish . . . . . Megaphorus martinorum (Cole in Cole & Pritchard, 1964) [OR, WA, ID]
	Larger than average species, 11-14 mm long.

	Gray and yellow species. Femora broadly red. Dorsum mostly yellow pilose, but general dark gray color on sides. Wings smoky yellowish, wing veins brown. Length 13-14 mm . . . . . Megaphorus willistoni (Cole in Cole & Pritchard, 1964) [CA, OR, NV, UT, AZ, WA, , CAN, BCA, MEX]
	Pale-colored species, with much red on femora. Largely white pilose. Wing veins yellowish. Species about 11 mm long . . . . . Megaphorus guildianus (Williston, 1885) [KS, MT, NC, WY, CO, NM, UT, OK, OR?, SD?, MEX]

	Stripe on scutum broad, dark, not divided by a gray line. Style abozt one-half length of postpedicel. Tibiae not darkened at tip. Small (9 mm) gray species . . . . . Megaphorus durangoensis (Cole in Cole & Pritchard, 1964) [MEX]
	Stripe on scutum gray-brown, divided by a whitish mid-stripe. Style nearly the length of postpedicel. Petiole of fifth radial cell r5 usually longer than m-cu crossvein . . . . . Megaphorus prudens (Pritchard, 1935) [AZ, NM, TX, CA]

	Entirely snow-white pilose, except for black bristly hairs of tarsomeres. Fifth radial cell r5 open. Femora largely black. Genital segments orange red. Length 10 mm . . . . . . Megaphorus pallidus (Johnson, 1958) [UT]
	Mostly yellow pilose. Fifth radial cell r5 open or closed.

	Fifth radial cell r5 usually closed and short petiolate. femora usually black, General color from a distance more brown than gray or gold. Robust, 12-14 mm in length. Wings with much brownish coloration . . . . . Megaphorus brunneus (Cole in Cole & Pritchard, 1964) [AZ]
	Fifth radial cell r5 open. Femora mostly red. Typically less than 12 mm in length.

	Mystax rather thin, gray-white, particularly in male, in which there are numerous long black bristly hairs on oral margin. Hind femora black except at base. tarsomeres black-bristled and black-haired . . . . . Megaphorus frustrus (Pritchard, 1935) [AZ, CA, NV, UT, CO, NM, MEX, BCF]
	Mystax dense, along with beard, snow white. Hind femora mostly red, front femora usually wholly orange-red. Antennal style usually less than one-half length of postpedicel. Tibiae yellowish red, not dark at tips except on outsiede of hind pair. Pile of scutum and most of abdomen golden yellow. Wings of male hyaline except for pale brown of costal region, wings of female slightly darker . . . . . Megaphorus flavidus (Cole in Cole & Pritchard, 1964) [CA]

Contents: © Fritz Geller-Grimm, Jorge N. Artigas, 2007
Layout & images: © Fritz Geller-Grimm, 2007