Effect of season and behavioral activity on the hypopharyngeal glands of three honey bee Apis mellifera L. races under stressful climatic conditions of central Saudi Arabia. - Ali, Hussain; Alqarni, Abdulaziz S.; Iqbal, Javaid; Owayss, Ayman A.; Raweh, Hael S.; Smith, Brian H. (Journal of Hymenoptera Research, 2019)