Stan wrote:

> And therefore I would like to know whether thiamethoxam actually "breaks
 down into clothianidin" or whether one of its breakdown product is a 
 nitroguanidine in the same class of chemicals asclothianidin.  

Stan this can help you, it's a document from the EUROPEAN COMMISSION
HEALTH & CONSUMER PROTECTION DIRECTORATE-GENERAL:
http://ec.europa.eu/food/plant/protection/evaluation/newactive/thiamethoxam_
en.pdf
See especially page 7, the first metabolite cited is CGA322704. 
This CGA322704 is indeed clothianidin, see also Footprint:
http://sitem.herts.ac.uk/aeru/footprint/fr/Reports/171.htm CQFD.

Best wishes,

Ghislain De Roeck,
Belgium.

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