634 THE BUTTERFLIES OF NEW ENGLAND. 



interspaces ; and excepting also a slender lunule of the same within the middle of the 

 iipper median interspace and a faint wavy streak of similar, ill-detined lunnles occu- 

 pying, in the upper half of the wing, the position of the inner series of linear lunules ; 

 outer edge cinnamoneous. 



At first glance I referred this to Charidryas nycteis from the silvery appearance 

 of the under surface of the Aviugs ; but examination of the structure and the mark- 

 ings left no doubt that it was to be referred to the present species, and this feature to 

 the silvery gray of the form marcia. I owe to Mr. Saunders an opportunity of study- 

 ing the original specimen, which has also been figured by Mr. Edwards, as noted 



above. 



Dimorphic forms. The two forms of this species are distinguishable mainly in 

 the color and markings of the under surface of the hind wings, which have a yellow- 

 buff ground color in morpheus, with comparatively inconspicuous or obsolete mark- 

 ings, especially in the male; wdiile in marcia the ground color ranges from bright 

 yellow to ferruginous, with heavy and strongly contrasted markings, either from the 

 intensity of the cloudy infuscations or the subnacreous tints of the lighter parts, or 

 both, in addition to dimorphic diversity, marcia is highly variable, Mr. Edwards 

 distinguishing four distinct types with intergrades between, the heaviness of the mark- 

 ings and the divergence from morpheus becoming more and more marked from north 

 southward. This refers only to the heaviness of the markings beneath, though 

 Edwards distinctly refers to the heaviness of the markings of the upper surface of 

 P. t. morpheus from Texas. It so happens, on the other hand, that I have seen no 

 individuals so heavily marked on the upper surface as some of the same summer form 

 which I took at the mouth of the Saskatcliewan, though others were of an ordinary 



character. 



Egg (64: 31). Tapering so that the truncate summit is half the diameter of the 

 egg; the polygonal cells of lower half shallow, saucer-like depressions about .03 

 niin. in diameter, which become more and more indistinct below. Vertical ribs 

 eighteen to twenty-five in number and merely the culminating rounded ridges of wave- 

 lil^e depressions of the surface; some of them unite before reaching the margin 

 of the truncate summit ; the interspaces between these is sometimes feebly and indis- 

 tinctly broken by wrinkle-like cross marks into cells about twice as broad as high. 

 Cells of flat summit decreasing in size toAvard the centre (67 : 15), around which their 

 lon«-er diameters radiate, the outer cells about .04 mm. and the inner cells about .0125 

 mm. in longer diameter; the boundaries of the cells are sharply defined, delicate lines. 

 Color light yellowish green, glistening. Height .5 mm. ; breadth .45 mm. ; breadth 

 of summit, .23 mm. 



Caterpillar. First stage (72: 6). Head (79: 12) glistening, dark, olive green, the 

 scattered hairs curving, simple and white ; ocellar field black, the ocelli pallid ; mouth 

 parts and antennae pale green. Body and papillae very pale green. Hairs generally 

 half as long again as the width of the body, black, arcuate; those of the laterodorsal 

 and lateral series curving backward, the lateral less arcuate and smaller; of supra- 

 sti"-matal nearly straight, of infrastigmatal, the anterior directed outward and down- 

 wal-d, the posterior only outward ; prolegs color of body, the legs green, but infnscated. 

 Length, 2 mm. ; breadth of head, .28 mm. 



Second stage. Head luteo-piceous with a slight, luteous, o1)lique stripe on either 

 side above, smoothly rounded, with scattered pale hairs as long as the depth of the 

 head. Labrum luteo-testaceous. Body pallid, with the fleshy, conical, apically blnnt 

 tubercles two or three times as high as broad , armed with brown, faintly spiculifer- 

 ous, acicular spines fully as long as the tubercles and arising from slight papillae. 

 Dorsal region faint, greenish brown, deepest on the thoracic segments, interrupted by 

 the tubercles on the abdominal segments and most marked here in an open ring, sur- 

 rounding the tubercles excepting in front and sending oft' divergent branches in the 

 posterior lateral corners; a broad, brown lateral band, interrupted by the supra- 

 stigmatal tubercles. Spiracles on elevated, fuscous-tipped tubercles, circular. Legs 

 pale greenish fuscous; prolegs pallid. Length, 3.25 mm. ; breadth of head, .42 mm. ; 

 length of tubercles, .15 mm. 



