. The Entomologist's record and journal of variation . ht.* Park Farm House, Banbury Road, Kidlington, Oxford OX5 lAH. 284 ENTOMOLOGIST S RECORD I/XI-XII/80 selves for their hobby are showing considerable interest in theHeath trap as an alternative to the Robinson trap. I myself acquired a Heath trap specifically as an aid toinvestigating the moth fauna of local nature reserves wherea convenient mains supply is not always available. Beingfamihar with the catches obtained at the Robinson trap witha 125W bulb, I found it difficult not to compare the twotypes of trap. Heath (1965) states tha
. The Entomologist's record and journal of variation . ht.* Park Farm House, Banbury Road, Kidlington, Oxford OX5 lAH. 284 ENTOMOLOGIST S RECORD I/XI-XII/80 selves for their hobby are showing considerable interest in theHeath trap as an alternative to the Robinson trap. I myself acquired a Heath trap specifically as an aid toinvestigating the moth fauna of local nature reserves wherea convenient mains supply is not always available. Beingfamihar with the catches obtained at the Robinson trap witha 125W bulb, I found it difficult not to compare the twotypes of trap. Heath (1965) states that the catch of macro-lepidoptera is 56% and the number of species 68% of that ina Robinson trap fitted with a 160W blended lamp. Manynights the catches in my Heath trap seemed very low indeed,far below those to which I was accustomed, and variouscolleagues have related similar experiences. This promptedme to run a series of experiments to compare the performanceof the two traps in a quantitative way for myself, and theresults are contained TABLE 2 Numbers of species of Macrolepidoptera taken in Robinson and Heath traps per night. COMPARISON OF HEATH & ROBINSON MOTH TRAPS 285 Experimental Procedure Both traps were used in the form in which they arecommercially available, and in which I imagine most entomo-logists operate them. The Robinson trap was supplied byMessrs. Watkins & Doncaster, Four Throws, Hawkhurst,Kent, and fitted with a 125W MB/U lamp; while the Heathtrap was supplied by Entech Services, 46 Mersey View, Liver-pool, L22 6QB, and was fitted with a 6W Actinic 5 tube. Bothunits were operated from the mains, the Heath trap employ-ing a control unit for AC mains operation also available fromEntech Services. (A) Geometric mean number ofMacrolepidoptera taken Heath Geometric mean catch as percent of Robinson Geometric mean catch Series 1 Robinson Series 2 Robinson Series 3 Robinson Me
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