Agromyza parvicornis Loew, 1869
IMPORTANT CHARACTERS (Spencer, 1973)
Wing length: 2.5 - 3.1 mm. Pale antennae, shining black mesonotum, costa extending to vein M1+2; pale squamal fringe.
Genitalia distinctive, distiphallus rather short, shown in (Ag parvicornis aedeagus.pct, Ag parvicornis aedeagus Sp.pct).
Leaf miner causes full depth mines especially in young leaves.
Zea mays L., Panicum miliaceum L. (millet) and probably other cultivated and wild grasses.
Widespread in North America, records from USA (Florida, Texas, Washington, Utah, Wisconsin); Canada (British Columbia, Ontario).
In his literature review Spencer, 1973 concluded the species were in the past a periodical pest in restricted localities and a potential pest, mainly on maize. However, in most cases parvicornis is kept in check by numerous parasitoids.