[A short revision of the species group Pegomya acklandi, with description of a new species (Anthomyiidae, Diptera)].

A key to 1 Japanese and 18 Chinese species of the Pegomya acklandi group, including 1 new species, is given below: 1(4) Apical border of the lateral lobe of 5th sternite with an angular notch. 2(3) Hairs on the basal part of surstylus rather thick and numerous; inner side of the twig of surstylus with a tubercle; apex of postgonite hook-like. ... Pegomya densipilosa Li et Deng, 1984. 3(2) Basal part of surstylus with sparse hairs; postgonite bluntly rounded at the apex ... P. rhagolobos Li et Deng, 1984. 4(1) No angular notch on the apical border of the lateral lobe of 5th sternite. 5(10) Aedeagus of fork type. 6(9) Lateral lobe of the 5th sternite with an arch of long setae. 7(8) Arch of long setae of the lateral lobe of 5th sternite in 2 rows and the apex extremely expanded; acrophallus with a hook bent to the paraphallus at the distal end; A3 twice as long as its width ... P. semiannula Li et Deng, 1984. 8(7) Lateral lobe of 5th sternite cone-shaped; acrophallus pointed apically and slightly curved; A3 as long as its width ... P. laterisetiata Deng et Li, 1988. 9(6) Setae on the lateral lobe of 5th sternite rather sparse and short; a strong seta behind the cerca; acrophallus with a small hook at the distal end; A3 as long as its width ... P. unimediseta Deng et Li, 1988.(ABSTRACT TRUNCATED AT 250 WORDS)