(ei) 9) 
single species such as P. locusta were drawn apart into more 
or less intimate relationships with separate Millerian groups. 
Mr Brayprorp then exhibited and described the series of 
Neotropical butterflies from the Godman-Salvin collection, 
which were shown by him on a previous occasion (Proc. Ent. 
Soc. Lond., 1896, p. xxxviii.); he stated that he used the 
term ‘ homemochromatism,’’ originally employed in the 
‘* Biologia Centrali-Americana,’’ in preference to Dr. Dixey’s 
term ‘‘reciprocal mimicry,” to denote the phenomenon 
exhibited by ‘‘ Millerian ’’ groups, because it gave a sufficient 
indication of its nature without assuming any theoretical con- 
sideration as to its origin. The series shown were :— 
ig HemaocHROMATISM BETWEEN Patrep SPECIES OF THE SAME 
GENUS. 
Heliconius galanthus and H. luce. Guatemala. 
H. chioneus and H. sappho. Panama. 
H. cydno and H, eleuchia. Colombia. 
FH. alithea and H. primularis. Teuador. 
Hach pair was closely alike on the upper-side; the under- 
sides were different, there being common types for the right- 
hand and left-hand members of the pairs respectively. 
There was also a progressive modification in the patterns of 
the upper-side in proceeding from North to South. 
II. HomaocuHroMATISM BETWEEN ParrREeD SPECIES OF DIFFERENT 
GENERA. 
Tithorea humboldti and Heliconius cassandra. Colombia. 
Tithorea candollei and Heliconius sp. Antioquia, 
(with these associated F’picalia chromis,@ ). 
Tithorea bonplandi and Heliconius hecuba. Colombia. 
Vithorea pavonit and Heliconius atthis Keuador. 
(with these associated Pieris locusta, 2). 
III. GeroGRAPHICAL MODIFICATIONS OF Homa@ocHROMATIC SPECIES 
OF THE SAME GENUS. 
Heliconius thelwiope and H, vesta. 
a. Parallel varieties of both species in Cayenne, inoscu- 
lating with H. melpomene at one end of the series, 
