NO. 3581 BALCLUTHA — BLOCKER 5 



Pygofer process not bifid apically, ari.sing on posterovcntnil margin; 



aedeagus not as above 5 



5(4). Pygofer process directed ventrally, not dentate; aedeagus with dorsal 

 apodeme expanded into two lateral lobes (fig. 20). 



guajanae (DeLong) 



Pygofer process directed posteromesally, dentate or not; aedeagus with 



three pairs of processes arising on dorsal apodeme (fig. 21). 



hebe (Kirkaldy) 

 6(3). Aedeagus in postero ventral view with shaft broad and deeply bifid 

 apically; forewing with third apical cell dark (fig. 27). 



Imeata (Osborn) 

 Aedeagus in posteroventral view with shaft not broad nor bifid apically ; 



forewings with apical cells not dark 7 



7(6). Aedeagus with shaft narrowed apically and strongly recurved (fig. 32). 



knuUi (Davidson and DeLong) 



Aedeagus with shaft not recurved apically 8 



8(7). Aedeagus with dorsal apodeme approximately one-third as long as 



shaft 9 



Aedeagus with dorsal apodeme much less than one-third as long as 



shaft 10 



9(8). Aedeagus with shaft evenly curved; style with preapical lobe broadly 



produced (fig. 29) flavescens (Baker) 



Aedeagus with shaft unevenly curved; style with preapical lobe as in 



figure 30 robusta (Caldwell) 



10(8). Aedeagus with shaft long, slender, curving anteriorly (fig. 22). 



floridana (DeLong and Davidson) 

 Aedeagus with shaft short, expanded basally, curving dorsally (fig. 33). 



Sander si (Davidson and DeLong) 

 11(2). Aedeagal shaft apex with overlapping lobes (fig. 28). 



chiasma, new species 



Aedeagal shaft without such lobes 12 



12(11). Aedeagus with pair of processes arising basally and dentate on posterior 



margin (fig. 26) denticula, new species 



Aedeagus without processes 13 



13(12). Aedeagus with preatrium conspicuous 14 



Aedeagus with preatrium very short or absent 15 



14(13). Aedeagal shaft with apical one-half curved dorsally, preatrium con- 

 spicuously curved ventrally then anteriorly (fig. 24) . 



aridula Linnavuori 

 Aedeagal shaft with apical two-thirds curved dorsally, preatrium not or 

 inconspicuously curved ventrally (fig. 23). 



neglecta (DeLong and Davidson) 



15(13). Aedeagus strongly curved anteriorly; connective with apex rectangular; 



style with preapical lobe subacutangular (fig. 31) . curvata Caldwell 



Aedeagus curved dorsally or anterodorsally; connective with apex 



expanded and truncate; style with preapical lobe rounded ... 16 



16(15). Aedeagus with shaft as wide apically as dorsal apodeme, unevenly curved 



ventrally then dorsally (fig. 25) cochrani, new species 



Aedeagus with shaft much narrower apically than dorsal apodeme, or if 

 not then shaft evenly curved dorsally or anterodorsally 17 



