888 Tin; lu tterflies of new England. 



height, uiiiforra in elevation luul .021 mm. wide; the spaces between the ridges are 

 circular pits, .021 mm. in diameter, tlie bottom of which is covered with a few thick- 

 ened white points, all but two or three of which arc clustered around the periphery. 

 Micropyle rosette (68 : 1) .06 mm. in diameter, composed of a central circle, .004 mm. 

 in diameter, surrounded by four oval cells directed toward it, their longer axes .018 

 mm. long, and their shorter .0125 mm. Height, .47 mm. ; breadth, .7 mm. Color, 

 accordin<; to Saunders, pale green. 



Caterpillar. Fourth staijc. Head pale greenish yellow, with a minute blacV; dot on 

 each side; mandibles pale brown, with a faint whitish patch immediately above them. 

 Body al)0ve yellowish green, streaked above with yellowish white, and thickly covered 

 with flue, short white liairs; tirst abdominal segment of rather a darker shade of 

 green than the rest of the body. .V dark green, dorsal stripe on the second and third 

 thoracic and first abdominal segments, the full width of the dorsal crest; narrow on 

 the four terminal segments, almost obsolete on those intermediate. A faint, whitish, 

 dorsal line runs through the centre of this stripe. Dorsal crest edged with yellowish 

 white, most apparent where it borders the darker portions of the dorsal stripe; sides 

 of body with a few faint, oblique lines of yellowish white; substigmatal fold of the 

 same color, whicli extends around the posterior segments. Under surface deeper 

 bluish green, with a faint white bloom. Legs and prolegs concolorous. Ijcngth, 

 10 mm. (after Saunders). See also under uext stage. 



Last sta/je (75 : 20). Head very pale green, the base of the triangle a very little in- 

 f uscated ; antennae pale, a fuscous spot at their interior base ; ocelli pale in a black 

 field , labrum white ; mandibles reddish. 



First thoracic segment dull, pale, dirty green; behind it a dark, In'ownish green, 

 dorsal stripe, nearly twice as broad anteriorly as posteriorly, almost blackish from the 

 second thoracic to the first abdominal, and on the sixth to ninth abilomiual segments, 

 bordered by a narrow, whitish liand on the second to fifth abdominal segments, placed 

 a little oblirpiftly ; this is again bordered with pale, dull, roseate patches, narrow in 

 front and broadening behind on each segment ; beneath this the sides are striped with 

 narrow, oblique bands of whitish and greenish; the ventrostigraatal fold is pale 

 bluish white, milk white on the seventh abdominal segment, and bordered w-ith roseate 

 above, excepting at the very tip ; beneath bluish green ; body completely covered with 

 minnte, white warts, emitting whitish hairs; spiracles white. Legs and prolegs 

 bluish green; claws of former fuscous. Length, 13 mm.; breadth, 4 mm. ; height, 

 2.5 mm. ; length of long hairs, .48 mm. ; of short ones, .16 mm. 



Younger specimens, 9 mm. long (fourth stage?), sliow a more decided diflerence be- 

 tween the length of the hairs, showing that the change in this respect from the juve- 

 nile to the mature larva is gradual ; in these the longer hairs were .25 mm. and the short 

 ones .04 mm. in length. These specimens also had the dorsal stripe entirely wanting 

 on the second to fifth abdominal segments, and sometimes the bordering line and the 

 lateral markings were obscured. Later in life, with no change of integument, the 

 dorsal stripe may sometimes become uniform in color over the whole body. 



Other full grown specimens, taken at first both by Mr. Saunders and myself to be 

 quite distinct, otl'er so many points of diflerence that I add a description of one of 

 them in full ; it is the other extreme of the variation (75 : 26). Head very pale green- 

 ish with a brownish tinge, the base of the triangle with a broad black band ; antennae 

 with the Ixisal joint white, beyond very pale greenish brown ; ocelli white in a black 

 field; labrum white; mandibles reddish brown. 



Body bright velvety grass green ; a faint, narrow, paler, dorsal line, from the middle 

 of the second thoracic to the sixth abdominal segment, bordered by a darker line, 

 more distinct posteriorly, and behind the sixth abdominal segment forming a not very 

 broad dorsal band; this again is bordered, distinctly only on the posterior segments, 

 witli paler green ; on the sides of each segment there is a narrow, indistinct, oblique, 

 pale streak, bordered on either side, but more conspicuously below, with darker green; 

 the ventrostigmatal fold is paler green, bordered above by a broader band of darker 

 green; hairs reddish brown; spiracles pale brownish, the posterior half more dis- 



