ACALYPTERATE DIPTERA FROM SUFFOLK IN THE CLAUDE MORLEY COLLECTION: 1. SCIOMYZIDAE P. WlTHERS The Diptera (two-winged-flies) of the Claude Morley Collection, housed at Ipswich Museum, have in part been dealt with in these Transactions. The acalypterate section, however, has so far been largely ignored. This paper is hopefully the first in a series dealing with some of the families in this interesting assemblage. Until recently, members of the family Sciomyzidae were considered to breed in refuse, detritus or humus, but since the seminal work of Berg (1953, 1961) and others it has become apparent that most sciomyzid larvae attack living gastropod molluscs, sometimes killing them, but more often living within their tissue as parasitoids. Over 200 species have now been reared worldwide, and all attack snails, slugs, freshwater clams or mollusc eggs (Knutson & Berg, 1971). The two major divisions within the British fauna reflect their association with either aquatic or terrestrial molluscs. Nomenclature in the species list follows Kloet & Hincks (1976), except that recent changes of Elberg & Rozkosny (1978) have been incorporated. In such cases, the Koet & Hincks name appears in parentheses. Grid references have been assigned by the author, and species not recorded from Suffolk by Stephenson and Knutson (1970) are indicated by an asterisk. It is likely that records for some of these species have been published elsewhere.
Species list Pelidnoptera nigripennis (Fab.)—1$, Barton Mills (TL 77), 12.vi.99; 1 9 , Staverton (TM 35), 14.vi.04. Colobaea bifasciella (Fall.)—1$, Brandon (TM 78), 22.vi.14; 1 $ , Brandon (TM 78), 31.vii.30. Pherbellia albocostata (Fall.)—lcf, Foxall (TM 24). P. cinerella (Fall.)—19, Glevering Park (TM 25), ll.v.23; 2 9 , Blythburgh (TM 47), 5.ix.44. P. dubia (Fall.)—19, Monk Soham (TM 26), 13.vi.17; 1 9 , Letheringham (TM 25), 15.vii.18; l c f , Glemham Magna (TM 36), 23.V.35; 1 $ , Chediston
(TM 37), 15.V.45. P. griseola (Fall.)—lcf, Brandon (TM 78), 8.viii.l3; l c f , Tuddenham Fen (TL 77), 19.vi.51; 1 other, Thelnetham Fen (TM 07), 30.vii.43.
Trans. Suffolk Nat. Soc. 20