Would be easier with an adult male! Acanthocercus atricollis is the only agamids with certain records from the Senkelle region, but there are also questionable old records of A. cyanogaster. A few other agamid species aren't too far away and might theoretically turn up near Senkelle. Regardless, in all probability A. atricollis, which is quite common. It is possible the specimens in Ethiopia, while currently included A. atricollis, actually are a separate species than the larger and often more colourful ones further south in Africa.