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I think, a Harrisina sp, but not sure... About 3.5cm long, blue/black colouration without any visible markings.
Among vegetation in semi-arid region, during rainy season. Elevation: ~1800 m.a.s.l
Looks very similar to this. Though Gardinia anopla is not found in Querétaro.
https://www.google.com/search?q=gardinia...