The Moths and Butterflies 415 



wings with six large white blotches; H. julvicosta has all the wings pure 

 white with the front margin of the fore wings weakly fulvous. A familiar 

 Arctian is the salt-marsh-caterpillar moth Eustigme acraa, expanse ij 

 inches, with creamy-white fore wings and soft yellow-brown hind wings, all 

 the wings sparsely dotted with black. 



A small family which includes a few widely distributed and well-known 

 moths is the Lasiocampidas, of which the tent-caterpillar moths are the most 

 familiar. All the Lasiocampid moths, which are robust, hairy, and fairly 

 large, lack the frenulum, having, however, the humeral angle of the hind 

 wing expanded so as to overlap the inner hind angle of the fore wing. . In 

 this humeral angle are one or two short supporting veins or vein-spurs. 



FIG. 596. Haploa julvicosta (above) and H. contigua (in the middle and below). 

 (After Lugger; natural size.) 



The best-known eastern species is the apple-tree tent-caterpillar, the 

 forest tent-caterpillar being also familiar; on the Pacific coast also occur 

 two common species, one specially affecting orchard trees. These four 

 species belong to the genus Clisiocampa (Figs. 598, 599) ; the moths expand 

 about i inches and are all brown, varying in shade from yellowish to walnut 

 to chocolate-brown, with a pair of pale or distinct light or darker oblique lines 

 on the fore wings. C. americana, the apple-tree tent-caterpillar, lays its 

 three hundred eggs in the summer in a band or ring glued around a small 



