[Taxacom] Identification key - Blattodea

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Dear colleagues,

Does anyone know about a good identification key to families of Blattodea
that does not require that the specimens have the hindwings exposed? I am
only interested in keys that cover families occuring in the neotropics.

Thank you,

-- 
L?via Rodrigues Pinheiro

Laborat?rio de Sistem?tica de Lepidoptera
Museu de Zoologia
Universidade de S?o Paulo
Av. Nazar? 481   Ipiranga
04263-000 S?o Paulo SP Brasil