LEPIDOPTERA : BOMBYCID^E. 403 



The Genus Dryocampa has the antennae deeply pec- 

 tinated to much beyond half the length, and thence 

 minutely serrated to the tips in the male, but simple in 

 the female. The larvae enter the ground to go through 

 their transformations. 



The Imperial moth, D. impcrialis, Harr., Eaclcs impcri- 

 alis, Hiibner, expands from four and a half to five inches, 

 and the wings are yellow, thickly sprinkled with purplish- 

 brown dots ; a large patch at the base, a spot near the 

 middle, and a band towards the hind margin of each 

 wing, light purplish-brown. The males have additional 

 purple, covering much of the outer hind margin of the 

 fore wings. It flies in June and July. 



The Senatorial Dryocampa, D. senatoria, Fabr., expands 

 from an inch and three quarters to two inches and a half, 

 and is ochre-yellow, the wings tinged with purplish-red, 

 and crossed by a narrow purplish-brown band. The fore 

 wings are dotted with blackish, and have a small round 

 white spot near the middle. 



The Genus Hcpiahis has the antennae very short, slen- 

 der, almost threadlike. 



The Silver-spotted Hepialus, H. argentco-maculatus, 

 Harr., expands two inches and three quarters, and the 

 fore wings have a triangular spot and dot of silvery white 

 near the base. 



The Genus Cossus has the wings long, thickly veined, 

 and the antennae with a double row of short teeth along 

 the under side. 



The Locust-tree Carpenter-Moth, C. robinia, Peck, ex- 

 pands about three inches, the color gray, the fore wings 

 thickly covered with dusky netted lines and irregular 

 spots, and the hind wings more uniformly dusky. The 

 male is much smaller and darker, and has a large ochre- 

 yellow spot near the hind margin of the hind wings. The 

 caterpillar bores the locust-trees and the red oak. 



