260 NOCTURNAL LEPIDOPTERA FOUND IN CANADA. 



powdered with the green atoms ; a series of black dots before the 

 fringe. Under side dirty grey, covered with brown atoms, with a dis- 

 cal lunule and some traces of brown lines ; a black point near the anal 

 angle. Thorax, palpi, and abdomen concolorous. 



Alar expansion 1"75 inch. 



Larva " entirely clear green without any markings ; head tolerably 

 thick, of the same colour ; feet slightly yellowish-green. It has no 

 protuberances ; and all its ventral feet (as is characteristic of this 

 genus) are equal and moderately long. On ' swamp dog-wood.' Pupa 

 obtuse anteriorly, with the abdomen very conical and ending in a fine 

 point : clear red, without any efflorescence. 



Sab. — North America. In April. 



2. Y. UNDULARis, Drury.— Guen, Noct. iii 18. Walk, C. B. ili., 

 Noct. xiii. 1074. 



Wings coal-black, with a great number of undulating lines as far 

 as the subterminal, and of streaks on the terminal space, all very dull 

 black ; subterminal moderately thick, swollen at both ends, and inter- 

 rupted opposite the cell by three white spots sullied with brown 

 scales ; reniform spot formed by some black lines, twisted, open at 

 both ends. Posterior wings with a black line which forms a continu- 

 ation of the subterminal, relieved below by some white atoms, and 

 surmounted by another much finer line. 



Under side of both wings clear testaceous-brown, with a multitude 

 of blackish streaks and scales, but without any definite markings j a 

 line on the hind wing indicated, however, near the anal angle, where 

 it is relieved by a little white. Palpi black, with white tips. Alar 

 expansion 1*75 inch, 



JSah. — North America. New York. 



