HESPERIOIDEA OP AMERICA 17 



usually marked by a fold. Mid tibiae without spines. Two 

 pairs of spurs present on the hind tibiae in our genera. Sec- 

 ondary sexual characters of the males: costal fold, tibial tuft, 

 tuft on secondaries, and basal lobes on under surface of abdo- 

 men. 



GROUP A 

 Group A is more widely represented in South and Central 

 America, and a number of our species are merely strays from 

 more southern localities. The genera have been very incon- 

 sistently treated in the past, and I am lumping a few of them 

 which show a complete lack of constant structural differences 

 with the exception of the costal fold. Several such as Cecrop- 

 terns and Tlwrybes are very closely related but because of the 

 very distinct form of the male genitalia I am retaining them, 

 based on such characters as will serve for their separation. The 

 group is distinguished by the length of the cell and the form 

 of the antennal club. 



Key to the genera 



1. L. D. C. of primaries very long and curved Phocides 



L. D. C. normal 2 



2. Apiculus of antennae longer than rest of club, straight and 



sharply bent at base Nascus 



Apiculus otherwise 3 



3. Primaries with a tubular, or at least well marked, recurrent 



vein in cell 4 



Recurrent vein scarcely traceable or absent 9 



4. Antennae with a distinct, slender, reflexed apiculus 5 



Antennal club fusiform, more or less elongate ; arcuate or 

 with a well rounded bend at middle 7 



5. Secondaries tailed Goniurus 



Secondaries not tailed 6 



6. Apiculus sharply bent; primaries apically produced 



Proti idi s 



Apiculus recurved; apex of primaries modera,te..E pargijn us 



7. Recurrent vein nearer vein 4 than vein 3 8 



Recurrent vein nearer 3 Chwides 



