336 LEPIDOPTERA OF NORTH AMERICA. 



FAM. XI. NOTODONTIDAE, p. 238. 



HETEROCAMPA. 



3. H. semiplaga Walker. Canadian Naturalist, 1861. 



Male and Female. Cinereous, thickly pilose, with a slight olive- 

 green tinge, whitish-cinereous beneath. Palpi distinct, obliquely 

 ascending, not extending beyond the frontal tuft. Thorax by the 

 hind border and abdomen at the base black. Wings partly clouded 

 with black, adorned with three indistinct irregular denticulated 

 black lines ; marginal line black ; fringe with black points. Fore 

 wings somewhat rounded at the tips, with a submarginal line of 

 black dots. Male. Antennae tawny, moderately pectinated to three- 

 fourths of the length. Female. Antennae simple. Length of the 

 body 9 lines ; of the wings 20 lines. 



Township of Montcalra, Canada. 



WALKER. 



FAM. XII. ARCTIADAE, p. 248. 

 ARCTIA SCHB. 



Stature robust. Head and thorax" with long hairs. Tongue 

 usually very short. Palpi porrect, short, very hairy ; first article 

 longer than the second ; the third subacute. Antennae slender, 

 rather long. Thorax not crested. Abdomen annulate, robust. 

 Male. Antennae pectinate. Female. Antennae serrate, sometimes 

 pectinate. Hind tibiae with four spurs; fore tibiae simple. Colors 

 and markings different ; primaries dark, sometimes white, gray, or 

 yellow, or with bright spots or streaks ; secondaries with dark 

 spots on a lighter ground. Secondaries with eight veins. Flight 

 nocturnal. Larvae solitary. 



1. A. americana Harris. Figured in Agassiz' Lake Superior, pi. 7, fig. 5. 



Head brown ; antennae white above, with brown pectinations. 

 Thorax brown above, margined before with an arcuated yellowish- 

 white band, which is continued on the outer edge of the shoulder 

 covers; upper edge of the collar crimson-red. Primaries coffee- 

 brown, with three yellowish-white spots on the outer edge, and 



