By Richard Bohart and Lionel Stange

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Extra info for A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae)

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Magretti. There is some sex difference in sculpture, with the female from Costa Rica having the frons and scutum striatopunctate whereas the male has these areas macropunctate with scattered micropunctures. z. PROMINENS GROUP Stem of tergite II shorter than that of I; pronotum and mes-onotum densely micropunctate and with scattered small macropunctures; female without striae on clypeus or frons; interantennal 36 University of California Publications in Entomology area raised but not carinate; frons "vith inconspicuous erect hair, mesonotum nearly bare; subhumeral area broad; notaulices \vell de:fined in posterior one-third, faint in anterior two-thirds; scutum and scutellum on the same level, divided by a simple seam; lateral propodeal carina sharp and complete, no submedian carina, apical lamella projecting prominently over lo"weT lamella; tergites I and II rather shiny, II "vith fairly close but weakly impressed micropunctation; male antennal hook large, compressed to-ward apex.

Length to apex of tergite II about 20 rom. Agreeing with female except as follows: clypeus \vith apical pale band, small spot laterad of tentorial pit, sometimes tiny scrobal spot and apical spot on scape beneath, legs mostly reddish; short erect pubescence on head and notum, punctation coarser; antenna pale spotted on flagellomeres VII and VIII, hook (fig. 11) ; mandible with nearly even cutting edge, clypeu8 bidentate apically; fore basitarsus strongly compressed laterally, somewhat twisted and in thin side view more than twice as broad apically as basally; genitalia much like that of coeruleopennis (figs.

Profile of two basal gastral segments of female hoIotype. Figs.. 27, 28. Face and profile of two basal gastral segments of female holotype. Bohart and Stange: A Revision of the Genus Zethus Fabricius 39 5. Gaster practically all orange-yellow, as well as much of head and thorax; scutum 'with inconspieuous micropubescence except just in front of scutellum (Colombia, Surinam) bequaerti Bohart and Stange Gaster all dark bro,vn, as 'well as most of body; scutum covered with velvety bro\vn micropubescence (Peru) " rossi Bohart and Stange Zethus (Zethus) chalybeus Saussure Zethu8 chalybeu8 Saussure, 1852.

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