Figure 103 from: Onuferko TM (2018) A revision of the cleptoparasitic bee genus Epeolus Latreille for Nearctic species, north of Mexico (Hymenoptera, Apidae). ZooKeys 755: 1-185. https://doi.org/10.3897/zookeys.755.23939

Figure 103 Head (in lateral view) of female A E. australis, in which the frontal keel is strongly raised, and B E. brumleyi paratype, in which the frontal keel is only weakly protuberant. Scale bars 1 mm. Note that the supraclypeal area is usually covered in dense white tomentum, which was partially removed in these specimens to show the maximum extent of the keel.