XVin SYNOPSIS OF THE GENERA. 



Fam. II. Pieridae. 



Anteniise truncated at the extremity or clubbed. Secondaries 

 with, no concavity on abdominal edge, abdomen received into a 

 groove, color whitish or orange to greenish-white on the upper side. 



A. Antennse abruptly terminating in an ovoid club ; 



a. Wings narrow, elongate. 



* Secondaries wider than the primaries. [Mexican.] Leptalis. 

 h. Wings of ordinary width. 



t Palpi with long fascicled hairs, last article shorter than 

 the preceding. 

 a. Antennae rather long. [Mexican.] Euterpe. 



6. Antennae very short. Nathalis. 



tt Last article of the palpi at least as short as the pre- 

 ceding. 

 a. An auroral spot at the summit of the primaries, 



at least in the males. Anthocaris. 



B. No auroral spot. Pieris 



B. Antennae truncated at the summit or terminating insensibly in 



an obconic club ; 

 a. Wings robust. 



* Primaries angulate. Rhodocera. 

 ** Primaries not angulate, secondaries entire. 



a. Antennae rather long, terminating insensibly in a 



club. Callidryas. 



B. Antennae short, terminating in an obconic club. 



Colias. 

 h. Wings thin and delicate. Terias. 



Fam. III. Daiiaidae. 



Palpi remote, not extending much beyond the head, club of an- 

 tennae formed insensibly ; wings wide, with the edges somewhat 

 sinuous, discoidal cell of the secondaries closed, thorax robust, 

 pectus with white dots, four walking feet. 



Secondaries of the males with a black spot in relief. Danais. 



Fam. IV. Heliconidae. 



Abdomen slender, elongate ; wings narrow, oblong, abdominal 

 edge scarcely embracing the lower part of the abdomen, discoidal 

 cell closed. 



Antennae longer than the head and abdomen, nearly filiform, in- 

 sensibly thickening towards the extremity, four walking feet. 

 [Only one sjiecies ; southern.] Heliconia. 



