JOURX.^L 



J}t\a ]8opk 6lntoraoIogirfll HoriFtg* 



V^ol. X. MARCH, 1902. No. 1. 



CONTRIBUTIONS TO THE KNOWLEDGE OF 

 NORTH AMERICAN ARCTUD^, I-II. 



(Plates I and II.) 



By Otto Seifert. 



Arctia arge Dntry. 



In the neighborhood of New York city, on dry, sunny hillsides 

 and scanty pastures under loose stones and rubbish, two kinds of 

 Arctia caterpillars may be found in numbers late in fall and again 

 early in spring before the new vegetation has made much progress. 



One of these, hibernating most frequently nearly full grown, is 

 the grayish-brown, long-haired larva oi Arctia arge ; its flesh colored 

 dorsal, subdorsal and infrastigmatal angular band, as well as the 

 pale, long rather soft vestiture distinguishes the larva easily from all 

 others which may be found under the same circumstances. All the 

 arge \a.xvx have the stripes distinct and plain, mostly flesh-colored, 

 less frequently cream-colored or variegated with reddish spots ; the 

 ground color of body varies from dark gray to brown, always with 

 darker patch- like shades. 



The moth appears during the latter part of April and is common 

 in the beginning of May ; contrary to most of its relations the female 

 of arge deposits her eggs in regularly arranged masses from 25 to 

 more than 200 securely fastened to the underside of a leaf of one of 

 the numerous food plants or in a rather uniform broad ring around 

 the withered branchlet of an aster or a decayed flower-stem. The 

 white color of the eggs, when exposed in this way, correspond with the 

 objects they are attached to. The shape of the eggs as well as the 



