2 Journal New York Entomological Society. [Voi. x. 



reticulations are nearly the same as of most of the Arcfia but are 

 decidedly more rounded at the apex. Newly deposited they are 

 maize-colored, turn quickly opaque white and by degrees change 

 from ])ale pink to lilac and at last to dull slate. The micropyle as a 

 dark spot is plainly indicated very soon after the egg is laid. The 

 larva and its early stages are well known ; the egg-state lasts 9 to lo 

 days, the larval period at least 38 days and the imago will appear after 

 not less than 12 days of pupal rest. A large number of the individ- 

 uals of a brood follow this rule, but as with most of their related 

 species the irregularity in the develoj^ment of the same progeny is ob- 

 vious. Larva; of the same brood may yet be feeding, while imagines are 

 already at large ; hence a continuous propagation takes place and the 

 moths as well as the larv?e are present from early spring to rather late 

 in fall, so that exposed females readily find mates at any time provided 

 the species occurs in the vicinity. 



Arcfia ar!^e exposed and found mated near New York city, 2, 

 V. II, V. 29, V. 4, vii. 16, vii. 17, viii. 23, viii. 30, ix. 



Arcfia /lais, exposed and found mated near New York city, 14, 

 v. 17, V. 19, V. 31, V. 8, vi. 6, vii. 26, vii. 10, viii, 4, ix. 22, ix. 



I, X. 



The pupa, compared with those of the group Apanfesis Wlk. 

 (Dyar, Revis. N. A. Bombyces) is more raised on first abdominal 

 segments ; the cremaster terminating in a blunt, furrowed, jointed 

 spine with short, knobbed hooks around the end, to which the empty 

 larval skin tenaciously adheres. The varial)ility of the imagines is 

 limited to a more or less extension of the pinkish cream-colored bands 

 on primaries and the number, size and intensity of the black spots on 

 secondaries and more restricted to the females, the variegated at- 

 tempts of the pink and salmon-red shades to extend and intensify. 

 The black abdominal spots are also liable to change in size, but are very 

 rarely confluent to bands (female) ventrally. This is the case, though 

 with a melanotic form (male), where the black of primaries is very in- 

 tense and prevailing, the cream color limited to the veins only ; the 

 secondaries are smoky black, deepest and almost forming a broad band 

 on outer margin diminishing towards the base of wing, the triangular 

 discal spot well defined but narrow. The under side uniformly dusky, 

 blackish with fine pale veins, costal margin deep red. 



Freshly formed pupje exposed to a temperature of about -f 38° C. 

 (100° F. ) for 100 hours gave after six days, male imagines with the 



