I am following this now, what Kerr and others brought in was Scutellata, but it was not ID as an indpendant species from Adansonii till later... earlyer work they are call adansonii, middle work the names are used interchangeably, later work its scutellata.It turned out to be Apis mellifera scutellata and not adansonii.
"Africanized bee sperm from Brazil was introduced to Louisiana in 1960 and 1961, and through four generations of backcrossing, Africanized stock was maintained in the field for years (Taber 1961, 1977). Despite these opportunities for population expansion, such introductions did not noticeably modify the behavioral or genetic characteristics of the local European honey bee population. African germplasm has not been discovered in the U.S. or Europe in the few genetic
studies performed recently using isozymes (Sheppard & Berlocher 1985, Sheppard & McPheron 1986, Sheppard 1988), and mtDNA and nuclear DNA restriction patterns (Smith et al.1989, Hall & Muralidharan 1989, Hall 1990). This absence of African influence contrasts markedly with the genetic takeover documented in Brazil in the 1960s, after the 1956 introduction of bees from South Africa."