Beetle with simple antennae longer than its body, orange on the thorax, found on the flowers of Euphorbia esula at the edge of a spurge patch ca 5 m by 5 m, in full bloom, along with numerous other flower visitors including Diptera and Hymenoptera. Collected. Level patch, full sun, in floodplain N of a small pond, with Kochia scoparia, Agropyron, Bromus tectorum, and Lepidium chalepense. Sunny afternoon with gentle W breeze, 71 F.

Elevation ca 4000 feet. Disturbed riparian corridor on stream restoration site within a patchwork of native and non-native grassland.

Keyed to genus in Arnett et al. 2002. Important characters include the head facing downwards; the mesotibia with a subapical notch on the dorsal surface; tarsal claws appendiculate; and the abdominal ventrites basically equal in length. Presumably this is Oberea erythrocephala, just based on the host plant - but I haven't been able to get my hands on a North American key to the genus that includes this species. If someone could confirm species and tell me what to look for to distinguish it from other Oberea, that would be wonderful!