Fig. 4 in A review of the cleptoparasitic bee genus Epeolus Latreille, 1802 (Hymenoptera: Apidae) in the Caribbean, Central America and Mexico

Fig. 4. Head of female. A. E. bifasciatus Cresson, 1864 showing frontal area with impunctate, granulose protrusion (blue arrow) on each side. B. E. obscuripes Cockerell, 1917 stat. nov. showing frontal area with very weak / inconspicuous protrusion (blue arrow) on each side. C. E. scutellaris Say, 1824 showing dorsal protrusion (blue arrow) on each side where upper genal area meets vertexal area. D. E. pusillus Cresson, 1864 showing frontal and vertexal areas without protrusions. E. E. chamaesarachae Onuferko, 2018, paratype, showing vertexal area with two shiny, impunctate protrusions (blue arrows) on each side. F. E. flavofasciatus Smith, 1879 showing single (closely punctate) dorsal protrusion (blue arrow) on each side where upper genal area meets vertexal area. Scale bars = 1 mm.