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Rasahus sulcicollis
Black Assassin Bug with yellow markings on the wings and hind legs. About 1 cm long. Family Reduviidae. In the reference cited, an identical specimen was photographed in Honduras.
Came to an ultraviolet light. Finca Argovia, Coffee Plantation, Soconusco Area of Southern Chiapas, Mexico.
Reduviidae, Peiratinae, Rasahus sulcicollis, definitely and without any doubt! But the other one, hmm...