Allochares azureus is a distinctive species of spider wasp, especially in the shape of the head which is convex in the front and concave in its rear, this is especially marked in the males.

It also has a characteristic excavated propodeum which has conical teeth pointing towards the wasp's posterior.

The body of the wasp is black but the short hairs cause it to have blue or green iridescence.

The lack of spines and modified tarsal claws shown by A. azureus appear to be an adaptation to this as their presence could probably cause the wasp to get tangled in the velcro like threads of the spider's web.

[4] The adults have been observed or caught feeding on flowers of Baccharis and Solidago,[3] and also Acacia, Asclepias, Condalia, Hyptis emoryi and Colubrina texensis.