THE NANTUCKET PINE MOTH. 747 



there are numerous, often partially conduent, short bars or stripes on the upper half 

 of the wing, and, next the inner margin, very brief similar bars, increasing in size 

 toward the base, and on the oasal third forming a dull pearly patch. The whole of 

 the basal third or fourth of the wing is traversed irregularly by transverse pearly 

 lines, often nearly or quite confluent ; and in some individuals the whole basal half 

 is of nearly uniform pearly hue. Many of these pearly scales appear to have fuligin- 

 ous bases, so that where the patches are broadest the color is usually duller. The 

 outer edge of the wing is marked by scattered black scales, edged within and some- 

 times without by a delicate white line ; and the fringe, which is very long, especially 

 below, is pearly fuliginous, often deepening apically to black, and with all the 

 scales minutely white tipped, forming transverse lines of white upon the darker 

 ground. Hind wings very pale silvery gray, slightly infuscated, the fringe infus- 

 cated only at base, outside of a silvery hue. Legs silvery gray, the tarsi infuscated 

 above at the base of all the joints. Abdomen silvery gray, more or less infuscated 

 above, or sprinkled with brownish fuscous scales. 



Expanse of wings, 12 to 14"'"^ ; length of body, 4.75to5.75"'"i ; length of antennae, 

 3.5'"°'. Described from twenty specimens. 



There seems to be no colorational distinction between the male and the female, 

 but considerable general variation, both in the markings and in the tints of this 

 beautiful but destructive insect. Some individuals occur in which the deeper colors 

 are intense, while at the other extreme the pearly scales have spread so widely, and 

 at the same time the more brilliant tints hav^ become so subdued, as to give the 

 whole insect a drab appearance. The two shades of umber also grade into each 

 other in all cases, being seldom sharply separated. The markings as above described 

 are those most prevalent. 



The eggs seen were not described. 



Larva (fig. 4).— Slender, cylindrical, slightly depressed, of a pale-brow„ color 

 above, the thoracic segments slightly darker, with a faint pale mediodorsal line 

 which broadens and becomes somewhat yellowish on the two hinder segments, on 

 the last occupying nearly the whole breadth of the segment ; the lower part of the 

 sides and the under surface are dirty luteous. The head varies from castaueous to 

 pitchy castaneous, is broader than long, obscurely subcordate, the lateral hemis- 

 pheres being tumid above, and separated by a deep and narrow groove ; the antenna 

 and most of the mouth-parts are pale luteous, the ocelli black. The prothoracio 

 shield is of the color of the head, transversely obovate, more than twice as broad as 

 long, and divided by a pale mediodorsal stripe ; the hinder margin is broadly rounded, 

 the front margin nearly straight, and the lateral margins rounded subangular, poste- 

 riorly melting into the hind margin. The anal plate is scarcely darker than the body, 

 small, almost semicircular, but less than twice as broad as long, and slightly tumid. 

 The legs are of the color of the under surface of the body, but are marked with fus- 

 cous, the claws reddish ; the prologs are also fuscous, and the spiracles edged with 

 piceous. The body is uniformly but rather sparsely clothed with microscopic hairs, 

 scarcely perceptible with a good lens ; and besides these has longer and stouter, but 

 still delicate pale hairs, about as long as the width of the body, scattered over the 

 upper surface, arising one each from minute piceous warts, which are definitely 

 arranged on both sides of the body; two on a segment in a dorsal-pleural row, two 

 on a segment in a ventro-pleural row, and one on a segment in a stigraatal row. 

 There are similar hairs scattered more irregularly on the head and prothoracic 

 shield. Length, 13"™ ; breadth, 2'""'. 



Chrysalis (figs. 2, 2a, 3, 3a).— Almost uniformly castaneous, with wing-cases, 

 eye-covers, antenufe, and sometimes some of the hinder edges of the dorsal scuta of the 

 abdomen dusky. The rostrate prolongation of the anterior extremity of the body (fig. 

 2) is bent downward at a slight angle, preserving above the curve of the head, pretty 

 strongly and uniformly compressed, docked apically, triangular as viewed laterally, 

 the sides hollowed, and the upper surface slightly sulcate, its lateral edges a little 



