xxi, xxii] € a) 
had been long known to him, because of the obvious and 
interesting analogy with the interpretation of the powerful 
posterior legs of the male Heterochelus, sp., offered by Dr. G. 
B. Longstaff at the last meeting of the Society (p. 93). 
Dr. F. A. Dixty exhibited specimens of Pierinx belonging 
to the following species:—Terias lxta, Boisd., Tesacolus 
puellaris, Butl., and 7. danaé, Fabr. (India); Zerias brigitta, 
Cram., Teracolus anne, Wallgrn., 7. speciosus, Wallgrn., 7. auxo, 
Lue., 7. omphale, Godt., and 7’. eris, Klug (Africa) ; Terias 
delia, Cram., Xanthidia nicippe, Cram., and Pyrisitia proterpia, 
Fabr. (America). The under surfaces of the “wet” and 
“‘dry” phases were in each case shown side by side, in order 
to illustrate the very general tendency in these and other 
species to assume a reddish coloration beneath in the dry 
season, This tendency was most marked in the American 
forms shown, and least marked in the Indian ; but was clearly 
seen to be common to all three Continents, The reds varied 
in character—sandy-orange, terra-cotta, Indian red and _brick- 
purple being all represented; and the contrast with the 
usually pale appearance of the under surface in the wet 
season was in every case very distinct. 
Dr. Dixey remarked that it could hardly be doubted that 
this infusion of red in the “‘ dry-season” forms had a cryptic 
significance, and stood in relation with the very general preva- 
lence of a reddish coloration, mostly due to the presence of 
iron, in the sandy wastes and bare patches of soil which 
formed a prominent feature in the tropical and sub-tropical 
regions inhabited by these and kindred species. He had himself 
observed that when the dry-season form of Jeracolus speciosus 
settled on the red sandy soil of the “Bluff” at Durban, and 
then closed its wings so as to conceal the whole of the fore-wing 
except the tip, the uniform red of the under surface as then 
displayed made the insect very difficult of detection. A 
general redness of soil, recalling that of parts of the Devonian 
system in England, was characteristic of large areas of the 
African Continent ; and Dr. Longstaff had informed him that 
similar conditions prevailed in India and China. The species 
exhibited were generally ground-haunting ; and in all cases 
the reddish tinge of the under surface extended to the tip of 
