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lIylcmya spp. parasites \\'ere introduced from Europe in the early 1950's but t\\'o <strong>of</strong> the most<br />
important species were al ready present under other names. Alcochara bilil/cufa Gyll., the introduced<br />
staphylinid, \\,:IS disco\'ered to be conspecifie with AleocJltlf(l lIilida era\'. and /Jaryo(illl(1 olllariOllis<br />
Casey; Trybliographa (Tryhliogrllpha) rapul! (Westw.), a cynipid, was synonymous \\'ilh CotllOlltlsp;s<br />
gillettl'i \Vashh. t\ prior survey <strong>of</strong> biotic agcnts in <strong>Canada</strong> and the countries from which they were<br />
obtai ned, follo\\'ed by a taxonomic comparison <strong>of</strong> specimens <strong>of</strong> each species from <strong>Canada</strong> and the<br />
country from which introduction was proposed, would ha\'e reduced the possibility <strong>of</strong> introducing<br />
species Ih:1I \\'ere already preselU in Can;l.(b.<br />
Bigol/ichl'ta spillipmll/s (i\leigen), a tachinid parasite <strong>of</strong> Forficllia allricuft/ria obtained from<br />
England fai led to bci:ome established following the release <strong>of</strong> colonies in 1928 to 193 1. It became<br />
established from coloni!.'S released in 1934 to 1936 from stock which originated in Europe and was<br />
propagated in the United States. 'I'hough the original stock from England and Eu rope W:1S <strong>of</strong> the S:lTlle<br />
species, only stock frolll Eu rope became established.<br />
A somewhat simi lar example is that <strong>of</strong> Ascogastl'r carpocapSflI! Vier. which is taxonomically<br />
synonymous with II. q//(/(iridelllata. The for mer is:l well known and widely
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