1970] 
Carde , Shapiro, Clench — Lethe 
95 
Fig. 21. Distribution of Lethe eurydice eurydice (solid circles) and 
Lethe eurydice juntos a (solid triangles). 
Adult Behavior . — The most striking difference between L. e. 
eurydice and L. appalachia , and the one leading to the discovery 
of their sympatry, is their differential habitat selection (Shapiro and 
Carde, 1970). At the McLean Bogs Reserve, Tompkins Co., New 
York, these two species are frequently found flying within a few 
feet of each other, but do not mix. The preference of L. appalachia 
for shaded habitats often results in its association with L. p. anthedon 
upland or L. p. portlandia on the Coastal Plain. We have found 
L. e. eurydice only in relatively open sedge marshes or, rarely, in 
drier meadows; it never enters dense shrub swamp or woods. We 
have seen L. eurydice and L. p. anthedon in copula in their usual 
habitats, once each (3 p.m. and 3:30 p.m., respectively). 
Discussion 
Although the term “sibling species” has been in the literature for 
nearly thirty years and the concept is even older, it still seems 
necessary to point out that excessive dependence on morphological 
