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Sphaeroceridae (Diptera) caught in light traps at Rothamsted Experimental Station, Herts., 1980–83

ABSTRACT. 1 A total of 7063 specimens of Sphaeroceridae representing forty species were caught in four light traps, two in woodland and two in the open, at Rothamsted Experimental Station between December 1980 and December 1983. 2 A complete list of species and the numbers of individuals of each is provided. 3 The catches in the two traps in woodland were less diverse than the catches in the two traps in the open. 4 Two‐way analysis of variance demonstrated a significant difference in catch from trap to trap. 5 When their similarities were compared, the four light trap catches formed two groups, corresponding with habitat type. 6 The majority of the catch were Copromyza similis (Collin) (5555 specimens or 78.64% of the total). The species was most abundant in winter from mid‐December to early February, although there were slight differences in times of maximum abundance between open and woodland habitats.