Acrobeles serricornis
Thorne, 1925

27. 29.
.615 mm
3.5 17. 24. 63. 92.5
2.5 5.5 6. 6.5 3.5

The single wing occupies an area one-tenth the body width at the middle.  The cephalic probolae are the striking feature of this species, being very slender and approaching the labial probolae in length.  The first half of their length is fringed by triangular membranes while the terminal half is setose.  A peculiar feature is the bifuraction of one of the termini of the cephalic probolae.  The bifurcate labial probolae end is triangular, forward pointing branches and are fringed with triangular membranes.  The posterior portion of the pharynx is heavily cutinized but apparently the plates are undeveloped.  In most respects the body closely resembles that of complexus.  Tail conoid, apiculate with the phasmids near the middle.
Male unknown.

From decaying sugar beet roots, Murray, Utah.

(Description- Thorne, 1925)