1510 THE BUTTERFLIES OF NEW ENGLAND. 



liigli, .08 mm. in height, sliglitly higlier al)i)vc than elsewlicre. Space between ribs 

 strongly concave and filled with straight, etiuidistant, transverse raised lines, only .017 

 mm. apart, the floor of the cells thus made, delicately punctuate. The saucer-shaped 

 depression of the summit is .18 mm. in diameter, lilled with nearly uniform, polygonal, 

 coarse-walled cells, about .01 mm. in diameter, in the centre of which the micropylic 

 cells occupy a circle .02 mm. in diameter. Height, .85 mm. 



Caterpillar. First stage. Head dull piccous, llnely shagreened, with pellucid hairs. 

 Body pale lemon yellow, the appendages pellucid, not over a fourth as long as the seg- 

 ments. Legs and prolegs concoloroiis. Length, 2.75 mm. 



Second stage. Head dull piceous, more or less shagreened, and with pale hairs. 

 Body pale green, made more or less hoary by the numerous, transversely arranged, 

 pallid papillae on each section of the segments, each giving rise to a very short, pallid 

 hair, apparently not half so long as one of the sections, and expanded at tip; a few 

 are so arranged longitudinally on successive segments as to cause a delicate infra- 

 lateral or latero-stigmatal line; posterior tlnrd of the body with a yellowish and 

 slightly dusky tinge, and the same but not dusky is found faintly along the substigraa- 

 tal fold. Spiracles apparently testaceous ; legs a little infuscated, the claws dusky ; 

 prolegs concoloi-ous. Length, 5 mm. ; breadth of head, .05 mm. ; of body, .65 mm. 



TTiird stage. Head piceous, well but delicately corrugated, the hairs gray. Body as 

 in preceding stage. Length, fi.5 mm. ; width of head, 1.1 mm. 



Fourth stage. Head as before. Body leather pale Ijlnish green, dotted with delicate, 

 infundibuliform, pale yellowish hairs on minute papillae, giving the wliole a gray-green 

 appearance with a faint, blue, dorsal stripe; and in addition there now appears, what 

 at least had not been noticed before, a laterodors.al anterior series of minute, glistening, 

 dark green lenticles, a little larger than the papillae, on the second thoracic to the ninth 

 abdominal segments; there is also now a distinct, pale yellow, lateral stripe fading out 

 on the thoracic segments and on the ninth abdominal segment, where it is well above 

 the edge of the posterior flap ; terminal segments somewhat discolored as if diseased. 

 Length, 10.5 mm. ; width of head, 1.5 mm. 



Last stage. (77 : I). Head uniform light red-brown, tlie surface granulated and 

 covered with tine down ; ocelli red-brown on a black stripe. Body obese, largest 

 in the middle, tapering about equally toward either extremity; first thoracic seg- 

 ment yellow, the shield concolorous; other segments gray green, caused by flue 

 whitisli granulations on a pale green surface; the dorsal region with a yellowish tint; 

 a dark dorsal line over the abdominal segments, and a pallid lateral stripe with no 

 • further markings. Length, 18.3 mm. ; greatest breadth, 4.6 mm. (After Edwards.) 



Fitch thus describes the caterpillar he found on witch-hazel : Head dirty white, its 

 base all around blackish, tlie vertex with a slight wide notch; jaws black. Thick- 

 bodied, broadest in the middle, very pale green with innumerable white dots, a slightly 

 deeper green dorsal line, and on each side of the back a whitish line; whole surface 

 with flue, short, white hairs, .75 mm. long. 



Chrysalis (85:27). Color of head case reddish brown, of wing cases less red, 

 more brown, with a gi-eenish tint; of mesonotum more yellowish; of abdomen pale 

 flesh color; surface smooth, covered by a fine short down with scattered short hairs 

 at anterior extremity. Length, 13.5 mm. ; breadth at mesothorax, 3.6 mm. ; of abdomen, 

 4 mm. (After Edwards.) 



The following is Fitch's description of the pupa shell : Pale dull brown, the abdomen 

 bright yellowish-red with a brown band on the base of each segment, except on the 

 under side and tip. No hooks at tip; and it lies loose in its pod. 13 mm. long; 3.8 

 mm. broad. 



Distribution (28 : 3). This species of Thanaos has a more northern 

 distribution than any of its congeners, being a member not only of the 

 Allcghanian fauna I)ut also of the Canadian ; the northernmost localities 

 from which it has been reported are: Nova Scotia "common" (Jones), 



