Lepidoptera Bhopalocera of Trinidad. 163 



form becomes fixed, and even in British Guiana the atergatis 

 form never occurs. While, on the other hand, going 

 northward into Panama one finds atergatis only. In Cuba 

 and Haiti a form of cc^^es has been retained in L. demeter, 

 which has the characteristic markings of ceres but with 

 the ground-colour much darkened. Kirby, in his catalogue, 

 p. 18, assigns to demdcr the same place as I have hinted, 

 but puts atergatis as a var. of cle6b»a, Godt. L. demeter 

 may or may not be quite removed from ceres, but atergatis 

 is the same thing in Trinidad, and only farther north does 

 it become a definite form. It should be mentioned that 

 Cramer's ceres is not the usual ceres form in British 

 Guiana, where the outer marginal half of the hind-wing 

 has most often become blackened. 



Subfamily ITHOMIIN^. 



4. TiTHOREA MEGAEA. (PI XVIII, figS. 3—35.) 

 Heliconius megara, Godt., Enc. Meth., ix, p. 223, n. 59 



(1819). 

 Found abundantly in Trinidad, particularly in the 

 vicinity of Port of Spain. In the Maraval, St. Ann's, 

 and Maracas Valleys I have met with it in numbers. 



Range. Brazil (?). 



5. Mechanitis veritabilis. 



Mechanitis veritabilis, Butl., Cist. Ent., i, p. 155 (1873). 



An abundant species throughout the Island. 



Range. COLOMBIA. 



This is nothing more than a well-defined form of M. 

 IJolymnia. In fact one of my specimens is undoubted 

 polymnia, while another has the yellow band beyond the 

 cell much broader than usual, the yellow patch within the 

 cell changed into the ground-colour. 



6. Melin^a tachypetis. 



Melinma tachypetis, Feld., Reise Nov. Lep., iii, p. 355, 

 n. 502 (1867). 



This must be a very rare species in the Island if it 

 really occurs and some mistake has not been made. Given 

 by W. M. Crowfoot. 



Range. Venezuela. 



