Habitat of Thorictus riyadhensis Háva & Abdel-Dayem, sp. nov. paratype in Rhodet Khorim, Ramah, Riyadh Province, at an elevation of 572 m. Trees of Acacia gerrardii Benth. (Fabaceae) in the background, shrubs of Calotropis procera (Aiton) W. T. Aiton (Apocynaceae) and Ziziphus nummularia (Burm. f) Wight & Arn. (Rhamnaceae), shrub of Lycium shawii Roem. & Schult. (Solanaceae) in the left corner of the bottom, and Rhazya stricta Decne. (Apocynaceae) in the foreground and middle.