1872.] 83 



stance which explains some patterns. The walls of the sac are sud- 

 denly augmented and strongly dilated in the transformation. Small 

 patterns preformed in the sac will also be altered and enlarged by the 

 same process, and I know that many patterns of Lepidopterous wings 

 are in such a way very easily explained. All the w aved lines of the 

 wings and other marks belong here, and as the ribs or nervures seem 

 to grow faster in transformation, the waved appearance would be 

 explained. In fact the greater part of the patterns seem to be pro- 

 duced by expansions or distraction of the pattern preformed in the 

 wing at some period before the transformation. 

 Cambridge, Massachusetts. 



DESCEIPTIONS OF SEVEN NEW EXOTIC EROPALOCERA. 

 BY W. C. HEWITSOK, F.L.S. 



(Seliconidce) . 

 Cltkas teanslucexs. 



JJl>per-side. ^ : transparent white, tinted with yellow near the 

 base ; the nervures black, the margins dark brown, broad on the 

 outer margin of the j^osterior wdug. Anterior wing with a minute 

 w^hite spot on the costal margin at the end of the cell ; the second 

 median nervule thickened as it approaches the outer margin. 



Under-side as above, except that there are some minute indistinct 

 white spots on the outer margin near the apex and anal angle of the 

 anterior wing, and a sub-marginal series of distinct white spots in 

 pairs on the posterior vdng. Antennge orange, wdth the base black. 



Exp. 3| inch. Hab. Ecuador (Buckley). 



This and the five following spp. are in my own collection. 



Heliconia Choaeina. 



Upper-side black. Anterior wing tinted with blue, with an irro- 

 rated ray of w^hite from the base ; crossed beyond the middle by a 

 curved irregular band of eight white spots, and by a sub-marginal 

 band of white spots. Posterior wing crossed beyond the middle by a 

 broad band of eight yellow and white spots, and by a sub-marginal 

 band of eight small white spots in pairs between the middle of the 

 wing and the anal angle. 



Under-side as above, except that it is rufous-brown, that the ray 

 from the base of the wings is broader, and has below it a spot which 

 is attached to the last spot of the central band, and that there is a 



