6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



17(16). Aedeagus with shaft regularly curved dorsally or slightly anterodorsally, 



forming less than a semicircle (fig. 34) .... incisa (Matsumura) 



Aedeagus with shaft curved conspicuously anterodorsally, semicircular; 



(fig. 35) diluta, new species 



18(1). Connective truncate apically 19 



Connective bifid apically, or at least with apical margin concave . 27 



19(18). Aedeagus with a pair of conspicuous long slender processes arising from 



dorsal apodeme; plates short and blunt (fig. 16) youngi, new species 



Aedeagus not as above, processes, if present, arising from shaft; plates 



elongate 20 



20(19). Aedeagus with preatrium conspicuous; shaft not bifid apically (fig. 



15) obunca, new species 



Aedeagus with preatrium absent or inconspicuous; shaft bifid apically 21 

 21(20). Aedeagus with pair of processes arising from ventral margin of shaft and 



extending nearly to apex (fig. 9) krameri, new species 



Aedeagus not as above, processes, if present, greatly reduced and occurring 



as expansions on lateral margins of shaft 22 



22(21). Aedeagus with shaft approximately four times as long as height of dorsal 

 apodeme; plates extending as far posteriorly as pygofer apex; distance 

 from eye to ocellus less than diameter of latter (fig. 18). 



caldwelli, new species 



Aedeagus with shaft approximately twice as long as height of dorsal 



apodeme; plates not extending as far posteriorly as pygofer apex; 



distance from eye to ocellus equal to or greater than diameter of 



latter 23 



23(22). Aedeagus deeply bifid apically, gonoduct in postcroventral view widest 



apically 24 



Aedeagus not deeply bifid apically, or if so then gonoduct parallel 



margined abdominalis (Van Duzee) . . 25 



24(23). Aedeagus not expanded apically, shaft in postcroventral view sagittate 



apically (fig. 14) dlstincta Linnavuori 



Aedeagus conspicuously expanded apically, shaft not shaped as above 



(fig. 13) diversa, new species 



25(23). Aedeagus in postcroventral view with a pair of distinct small triangular 

 processes on lateral margins at midlength of shaft, length 3.9 mm 



or greater abdominalis (Van Duzee) . . 26 



Aedeagus without such processes, or if present then rounded and incon- 

 spicuous; length 3.5 mm or less (fig. 10). 



abdominalis abdominalis (Van Duzee) 

 26(25). Aedeagus with shaft expanded apically, deeply bifid in postcroventral 

 view; from Panama (fig. 12) . . . . a. amplissima, new subspecies 

 Aedeagus with shaft not expanded apically, only slightly bifid in postcro- 

 ventral view; from Brazil and Argentina (fig. 11). 



a. fuscipennis Linnavuori, new status 

 27(18). Aedeagus with pair of processes arising from latcroventral margin of 



shaft near base (fig. 17) fuscina, new species 



Aedeagus without such processes 28 



28(27). Aedeagus with shaft short, curved dorsally; connective shallowly emargi- 



nate apically; from South America or Puerto Rico 29 



Aedeagus with shaft long, curved anteriorly or distinctly anterodorsally ; 

 connective bifid apically; from North America or Mexico .... 30 



