200 U.S. NATIONAL MUSEUM BULLETIN 261 



KEY TO MALES OF HOMALODISCA 

 Not included (unknown or known only from females): H. admittens (Walker), 

 H. exdudens (Walker), H. ignota Melichar (fig. 189), H. nitida (Signoret) (fig. 

 187), H. robusta Schroder, H. vitripennis (Germar). 



1 . Forewing with coriuni entirely opaque 2 



Forewing with corium mostly hyaline, sclerotized only before 



apical cells 5 



2. Aedeagus with a fringe of hairlike processes at apex, without other 



processes H. insolita (Walker)* 



Aedeagus not so 3 



3. Length 11 mm. or less; aedeagal shaft curved posteriorly at apex 



(known only from Arizona and Texas) . . . H. elongata Ball* 



Length more than 1 2 mm. ; aedeagal shaft curved anteriorly or 



dorsally (Brazilian and Central American species) 4 



4. Pygofer processes extending beyond pygofer apex ; aedeagus with- 



out ventral processes (Central America). 



H. apicalis Schmidt (fig. 181) 

 Pygofer processes not attaining pygofer apex; aedeagus with a 

 pair of ventral processes (Southern Brazil). 



H. ignorata Melichar (fig. 182) 



5. Asdeagus with diree pairs of processes 6 



Aedeagus with two pairs of processes 7 



6. Aedeagus with most ventral pair of processes small and incon- 



spicuous H. triquetra (Fabricius) (fig. 180) 



Aedeagus with most ventral pair of processes well developed. 



H. noressa, new species (p. 202) 



7. Aedeagus with dorsal pair of processes shaped like head of a bird 



in lateral aspect H. cornuta, new species (p. 202) 



Aedeagus with dorsal pair of processes not so 8 



8. Aedeagus with dorsal pair of processes falcate apically. 



H. hambletoni, new species (p. 203) 

 Aedeagus with dorsal pair of processes not so 9 



9. Crown of head with distinct linear markings; aedeagus with 



ventral pair of processes very short . . . H. lacerta (Fowler)* 

 Without above combination of characters 10 



10. Aedeagus with ventral aedeagal processes as long as dorsal 



processes and smoothly curved throughout their length. 



H. indefensa Melichar (fig. 186) 

 Not as above 11 



1 1 . Aedeagus with a deep concavity between shaft and bases of 



aedeagal processes 12 



Aedeagus without such a concavity . . . . H. coagulata (Say)* 



♦For illustration, see Young (1958a, pi. 2 {liturata=) lacerta). 



