Length: bug in photo 17 mm
Assassin Bugs in the genus Heza have their fore-femora much stouter than their mid- and hind-femora. They often hold these out in front, as in the photos.
Heza is similar to Rocconota but the latter genus bears a characteristic fold (ridge) on the mesopleuron.
Heza is one of at least 12 genera of Harpactorini that possess glands on their legs that produce a sticky substance useful in capturing prey. Only genus Heza has these glands plate-like in structure (Zhang and Weirauch, 2013).
Photo location: Along the Rewa River, Guyana.
American Insects site