158 THE COMMONER BUTTERFLIES. 



A southern species of Thorybes, T. hathyllas, very close to tliis but 

 with larger spots, has been occasionally found far north, even as far 

 as Massachusetts and Wisconsin ; and another species, T. electra, is 

 known only from Hamilton, Ontario. 



51. GrENUS ThANAOS. 



THANAOS LUCILIUS-LUCILIUS'S DUSKY- WING. 



(Nisoniades lucilius.) 



Butterfly. — Upper surface of wings dark grayish brown, the 

 fore wings with the basal half blackish, a double row of premar- 

 ginal gray spots and, next the costal margin beyond the blackish 

 base, a large and distinct cinereous patch, followed outwardly by 

 three minute vitreous spots one above the other. Under surface 

 fuliginous brown with pallid spots and dots in submarginal series. 

 Expanse about 1^ inches. 



Caterpillar. — Head with the summits considerably elevated, 

 black with three reddish spots and streaks on the sides. Body 

 naked, briefly pilose, with a slender pale yellowish lateral line. 

 Length f inch. 



Chrysalis. — Slender, the abdomen (exclusive of tail-piece) 

 longer than the rest of the body, the posterior lip of thoracic 

 spiracle scarcely raised, not flaring, the tongue-case scarcely ex- 

 tending beyond the wings ; pale green. Length somewhat more 

 than I inch. 



This butterfly probably occurs throughout our district, 

 but it has never been reported from Canada excepting in 

 southern Ontario, nor west of this locality except in distant 

 Dakota; nor in New England, where it is best known, has 

 it been found north of Plymouth, N. H., nor in Maine 

 or beyond that; it occurs in wooded rocky spots and win- 

 ters as a full-fed caterpillar. It is partly single-, partly 

 double-, and partly triple-brooded, there being annually 

 three apparitions of the butterfly in decreasing numbers : 

 early in May, the middle of July, and the middle of August, 

 some of the caterpillars of each of the first two broods as 

 well as all of the last ceasing to feed after they are full 



