222 Zoology of Colorado 



is seasonal variation, with spring forms of smaller size, not 

 genetically differing from the others. In addition to all this, it is 

 probable that by collecting large series in many localities, at 

 different seasons of the year, it would be possible to elucidate a 

 certain number of local races. Whether intermedia is such a 

 race, or merely shows the direct effect of the mountain climate, 

 is at present quite unknown. 



The family Lycaenidae includes the Blues, Coppers and 

 Hair-streaks, small butterflies usually with metallic colors. The 

 "Blues" are not always blue, but are often brown in the female 

 sex. The under side usually has small dark spots on a pale gray 

 ground. In a few species the wings have orange submarginal 

 bands. Lycaena heteronea, blue in the male and blackish brown 

 in the female, has markings on the under side like those of the 

 "Coppers," to which group it is actually transferred in the latest 

 Check-list. It is not uncommon in the mountains near Boulder. 

 The Coppers (Chrysophanus and allies) are usually brilliant 

 coppery red above, with some small dark spots. In some cases 

 they are strongly suffused with black. The Hair-streaks (Thccla 

 and allies) are of various colors, but mostly have one or more 

 short slender tails on the hind wings. Our most interesting 

 species is Callophrys sheridani Edwards. Above it is dark grayish 

 brown, but beneath a beautiful shade of green, with a white line 

 crossing each wing. It is considered one of the rarest of butter- 

 flies, but Sievert A. Rohwer took it at Boulder in April, and it has 

 been taken by Professor Gillette of the Agricultural College. 

 The larva remains unknown; it will probably be found on wild 

 raspberry or a related plant. Allied to C. sheridani, and more 

 common, is C. dumetorum Boisduval, in which the green under 

 side is not crossed by white stripes. 



The Skippers or Hesperiidae, very numerous in Colorado, are 

 usually thick-bodied, like moths. The antennae have the tip of 

 the club more or less distinctly pointed and bent. That these 

 are more primitive than the other butterflies is shown by the 

 venation of the fore wings, all the veins being present and separate. 

 The larvae have the head and body separated by a distinct neck, 

 absent in other butterfly caterpillars. We have no less than 25 

 genera represented in Colorado. The ones most likely to attract 

 attention are the very abundant little Checkered Skipper, Pyrgus 



