http://www.shigotonavi.co.jp/s_contents/s_temporary_26.html

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Note added at 28 mins (2011-02-04 06:53:43 GMT)
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Or professional 26 occupations

Any variation on the above would work.

I think michael59804 is talking about the correct 26 types of work, but I would translate the phrase differently, so as to better convey the fact that these 26 services are not subject to the same regulations under the law as the others because they are considered "specialist" services.

I think "special" would also be a little off, as the point is not just that they're designated as jobs subject to separate regulations. Rather, they are subject to separate regulations because they are jobs/assignments/services that require the special skills of a specialist.

http://www.ilo.org/public/english/dialogue/ifpdial/info/nati...
"The one year limitation does not apply to the following three cases (Art. 40 para. 1 No. 1-3):
the dispatched worker has one of the 26 types of listed special skills
the worker is needed for additional business of a limitted duration, or
an employee taking maternity or child care leave needs to be replaced."

http://www.japan-press.co.jp/2010/2667/labor4.html
"The other loophole is that although the bill bans the use of on-call temporary workers, it excludes '26 special job categories' which supposedly require special knowledge and technical skills."

http://www.jtuc-rengo.org/updates/index.cgi?mode=print&no=27...
"Moreover, JTUC-RENGO has demanded, as measures to be taken for the moment, prohibition of registration type of dispatch of those general jobs other than 26 specialized jobs specified in the Law, establishment of a regulation for user companies to conclude employment relationship with responsibility for securing working conditions and employment for the dispatched workers, equal treatment, reinforcement of the responsibility of user companies, regulation of daily dispatch and so forth."

http://search.japantimes.co.jp/cgi-bin/ed20100302a1.html
"Labor also questions why unskilled work such as filing and office machine operation is covered in the 26 'specialized' fields."

http://www.atimes.com/atimes/Japan/LA27Dh01.html
"The 26 'specialized' occupations to be exempted currently employ about half of Japan's 2.2 million dispatch workers, and lawyers say the vague definitions of the exempt occupations will invite abuse and undermine the effectiveness of the proposed law."