This paper investigates the problem of synchronization of networked robotic systems with uncertainties in both kinematics and dynamics. Passivity of the robotic agents is established through adaptation to both the kinematic and dynamic uncertainties. This input output passivation framework provides the basis for the inter-coupling inclusion between the robotic agents, even in the case of non-uniform constant communication delays. An adaptive scheme is proposed to achieve controlled synchronization of the networked robotic systems on strongly connected graphs. With a weighted Lyapunov-Krasovskii function, we show that both the task-space tracking errors and synchronization errors of the networked robotic agents converge to zero. Simulation results are provided to demonstrate the performance of the proposed control scheme. (C) 2012 Elsevier Ltd. All rights reserved.