The German cockroach is identified by two dark, parallel bands on the pronotum (shield) directly behind its head. TheGeneral Pest Management: Guide for Commercial Applicators - Category 7A(Chapter 7: Cockroaches) provides this as a key identifying feature. Option A (Oriental cockroach) is uniformly dark brown or black. Option C (Wood cockroach) is not a common indoor species and lacks these bands. Option D (American cockroach) has a different pattern, often with a yellowish figure-eight marking.
[Reference:General Pest Management: Guide for Commercial Applicators - Category 7A(MSU Extension), Chapter 7: Cockroaches.]
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