A new European species of Delia Robineau­Desvoidy (Diptera: Anthomyiidae) near the wheat bulb fly, D. coarctata (Fallén) Author Michelsen, Verner text Zootaxa 2007 1412 61 67 journal article 10.5281/zenodo.175665 38f2fd7a-33e5-46db-a6fd-ccf97b2125f3 1175­5326 175665 Delia coarctoides Michelsen , sp. nov. Figs. 1 , 3 , 5 , 7–11 . Etymology . The specific epithet ‘coarctoides’ is derived from ‘coarctata’, existing name for the most similar species, and ‘­oides’, a Greek adjectival suffix meaning ‘resembling’. Material examined . Type material. Holotype male, DENMARK : Jutland (W): Årgab, reared 16.ix.1951 from puparium found 30.vii.1951 (K.O. Leth), ZMUC . Paratypes . DENMARK : Jutland (W): 5 males , 5 females with same data as for the holotype , ZMUC . Additional material (in ZMUC if not stated otherwise). CZECH RUPUBLIC: Bilina­Vršiček, mixed wood, 420m , Malaise­trap, 1 male 25.vi–23.vii.1998 (Barták). DENMARK : W Jutland: Årgab, 29 males , 21 females , reared 16.ix.1951 from puparia found 30.vii.1951 (K.O. Leth); Skallingen, 1 male 10.vii.1932 , 1 female 25.vii.1932 (E. Bro Larsen). NE Jutland: Hulsig, 1 male 11.vii.1908 (Mortensen); Skagen, Grenen, 1 male 17.vii.1985 (H. Enghoff). FINLAND : Nylandia: Tvärminne, 2 males 12.viii.1923 (F. Frey), FMNH . Karelia australis: Vehkalahti, 1 male 3.viii.1974 (Tiensuu), FMNH . Tavastia australis: Topeno, Loppi, 1 male 8.vii.2005 (I. Kakko). Karelia borealis: Joensuu, 2 males 9­13.vii.1976 , 1 male 9.viii.1982 (O. Martin). SWE­ DEN : Skåne: Löderup, 1 male , 1 female 11.vii.1923 (O. Ringdahl); Hagestad, 1 male 11.viii.1983 (H. Andersson), MZLU . Description. The general descriptions of D. coarctata given by Hennig (1974a) and Griffiths (1991 , 1992 ) also apply to the new species D. coarctoides with a few exceptions as emphasized in the following. It is reliably separated from D. coarctata in the male sex only, although a differential description of both sexes is attempted in the following: Male. Vein C on basal section, between humeral and subcostal breaks, with several v setulae vs. bare on ventral surface. Fore tibia with apical pv seta short, pointed at tip ( Fig. 1 ) vs. long and coarse, truncated at tip ( Fig. 2 ). Length of fore tarsomere 1 equals length of fore tarsomeres 2–4 combined ( Fig. 1 ) vs. fore tarsomere 1 nearly as long as tarsomeres 2–5 combined ( Fig. 2 ). Mid tibia with 2 pd and 2 pv setae normally developed vs. same setae strikingly short and weak. Cercal plate in caudal view short, cordiform, less than 1.5 x longer than wide ( Fig. 3 ) vs. elongated, in caudal view c. 2.0 x longer than wide ( Fig. 4 ). Surstylus in lateral view markedly expanded on subdistal part ( Fig. 5 ) vs. barely expanded subdistally ( Fig. 6 ). Phallus, gonites and hypandrium ( Fig. 7 ) and sternite V ( Fig. 8 ) as in D. coarctata . FIGURES 1–2. Male right distal fore tibia and tarsus. 1. Delia coarctoides sp. nov. with numbered tarsomeres. 2. D. coarctata (Fallén) . Arrows point at apical pv seta. Same scale. FIGURES 3–4. Hypopygium, caudal. 3. Delia coarctoides sp. nov. 4. D. coarctata (Fallén) . Notice shape of cercal plate. Same scale. Female. Prealar seta short but distinct vs. absent or indiscernible from surrounding ground setulae. Vein C on basal section, between humeral and subcostal breaks, with several v setulae vs. bare on ventral surface. Spermathecae and ducts ( Fig. 9 ) and distal sclerites of oviscapt ( Figs. 10–11 ) as in D. coarctata . Taxonomic remarks. I have earlier ( Michelsen 1983 , 1985 ) examined the primary types of Musca coarctata Fallén , Anthomyza leptogaster Zetterstedt and Aricia paralleliventris Zetterstedt and can confirm that they all belong to Delia coarctata (Fallén) . Hennig (1974a) further examined the female holotype of Hylemyia garbiglietti Rondani from Piemonte, Italy and synonymized it with D. coarctata . I cannot see any reason to question Hennig’s identification. Distribution and biology . Known so far only from a few localities in southern Fennoscandia and a single record from the Czech Republic . The known collecting sites in Denmark and Sweden all have sandy coasts with white dunes or similar sandy, sparsely vegetated areas dominated by marram ( Ammophila arenaria ) and lyme­grass ( Leymus arenarius ). A likely possibility is therefore that either of these coarse grasses is favoured as a host plant for the larva of D. coarctoides .