IDENTITY OF LEUCOPIS ARGENTICOLLIS AND DESCRIPTION OF A NEW SPECIES (DIPTERA: CHAMAEMYIIDAE)

Abstract
The identity of Leucopis (Leucopis) argenticollis Zetterstedt, an adelgid predator described from Sweden, is established and a lectotype is designated for it; L. orbitalis Malloch, described from Illinois is placed as a synonym of it. Another species (predator of the mealy plum aphid) that was formerly confused with argenticollis, is described as Leucopis (Leucopis) conciliata McAlpine and Tanasijtshuk, new species. Both species are shown to be holarctic and are treated from the standpoints of adult and larval morphology, biology, and distribution. The paper contains 33 figures.