Genus: Megachile Latreille, 1802
Subgenus: Argyropile Mitchell, 1934
Common name: none
Megachile (Argyropile) often have a black integument with white, tan, or reddish hairs throughout their body, usually forming apical bands of hair on their terga (Michener 2007). They range in body length from 9–16 mm (Michener 2007; Gonzalez 2008).
Female Megachile (Argyropile) may be confused with bees within the subgenera Megachile (Pseudocentron) and Megachile (Acentron) because the female S6 mostly lacks hair and the apical edge is bent upwards (Michener 2007; Gonzalez 2008). However, Megachile (Argyropile) has a thick apical rim, while the other two subgenera have thinner and translucent rims (Gonzalez 2008). Megachile (Argyropile) also has a fully developed middle tibial spur, whereas Megachile (Pseudocentron) lack the middle tibial spurs and have an immovable prong or tooth instead (Michener 2007). All three subgenera differ in their mandibular structure.
Megachile (Argyropile) are generalists and have been observed visiting a variety of species within Asclepiadaceae, Asteraceae, Bignoniaceae, Brassicaceae, Capparaceae, Fabaceae, Hydrophyllaceae, Hypericaceae, Lamiaceae, Malphighiaceae, Malvaceae, Onagraceae, Polemoniaceae, Polygonaceae, Rhamnaceae, Rubiaceae, Sapindaceae, Tamariaceae, Verbenaceae, and Zygophyllaceae (Butler 1965; Gonzalez and Griswold 2007; Gonzalez 2008). However, Megachile (Argyropile) shows a preference for Asteraceae (Mitchell 1937a; Gonzalez 2008).
Megachile (Argyropile) have been observed nesting in trap nests and burrowing shallow nests in the ground, particularly in sandy soil (Fischer 1951; Butler 1965; Medler and Lussenhop 1968; Neff and Simpson 1991). The nests are lined with leaves, some of which were identified as Spiraea (Rosaceae) or Trifolium (Fabaceae) (Fischer 1951).
Megachile (Argyropile) is a subgenus of seven species, five of which are found in the U.S. (Gonzalez 2008).
There are no known invasives.