Osmia maxschwarzi are bees with a metallic green to blue hue on the abdomen and often a metallic violet luster on the clypeus (Müller 2012). Females have whitish hairs on the head except for light yellowish-brown hair intermixed with black hair on the vertex and frons. The thorax has whitish hairs aside from the scutum, which has light yellow-brown hair with black hairs intermixed. The abdomen has uninterrupted apical hair bands on T1–T5. The discs of T1–T4 are covered with long erect whitish hair with intermixed black hair, and T6 is densely covered with appressed whitish to black hair (Müller 2012). Males are as the females except they often lack the blackish hair on the scutum, and T5–T6 have erect blackish hairs, sometimes with white hairs intermixed (Müller 2012). Female body length is 9–10.5 mm, and male body length is 10–11 mm (Müller 2012).
(modified from Müller 2012)
Osmia maxschwarzi is looks very similar to O. scheherazade and O. maxillaris, which also have apical hair bands on the terga and mouthparts that are as long as the body length (Müller 2012). Female O. maxschwarzi can be differentiated by the more spaced out punctures on the scutum and terga, the larger impunctate area around the ocelli, and its overall smaller body size (Müller 2012). Male O. maxschwarzi can be easily distinguished by the distinct hair-filled emargination on S3, often covered by the expanded S2, which is not present in the other two species (Müller 2012).
Osmia maxschwarzi specimens have been recorded from western Turkey to central Iran (Müller 2012).