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Gryllus assimilis
Hola, these are not grilos but nymphs of a grasshopper.
Romaleidae, Romaleinae, Chromacris speciosa.
http://www.treknature.com/gallery/photo1...
http://www.whatsthatbug.com/2011/02/28/g...
http://ch.photos.com/royalty-free-images...
http://biostor.org/cache/pdf/05/60/90/05...