78 



SMITHSONIAN INSTITUTION 



Fig. 80. — Typical Virginian habitat of the sub-arctic skipper, Pyrgus 

 ccntaureae, at Rocky Run. The entomologists are Ashley B. Gurney, Rich- 

 ard P. Dow, Harald Rehder, Miss Grace Sandhouse, and Mrs. A. H. Clark. 



r*£i 



Fig. 8i. — -Two common mud-puddle butterflies; A, Colias philodice philodice 

 (female) ; B, Terias lisa (male). C, the common copper, Lycaena phlacas hypo- 

 phlacas; D, the " invisible butterfly," Calpodcs ethlius. 



