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beautiful white color, the hairs being all directed backwards, except those 

 of the first segment, which curve forwards; second and third segments each 

 side with a dorsal plume of erect hairs, nodding backwards, blackish at tip; 

 penultimate segment with a tuft separating into two depressed plumes; dor- 

 sal segments each with a short tuft of erect, black hairs ; sides with an 

 arrow shaped, blackish spot, not furnishing hairs. 



Aug. 3d. Divested itself of its long hairs, and appeared only thinly cov- 

 ered with short ones; length nearly one and one fourth inches. 



Aug. 6th. Became a pupa, without a cocoon; it would probably have 

 entered the earth, if permitted-. 



Aug. 4, 1838. Found on a leaf of Prunus virginiana, a caterpillar with 

 the body pale yellow, covered with flexuous yellow hairs, and an orange 

 colored pencil, tipped with black, on the anterior part of the eleventh seg- 

 ment. 



Aug. 7th. Changed its skin, the hairs became white, a pencil on the 

 second, third and eleventh segments black, and very short, black tufts on 

 each of the intervening segments. Body beneath ash colored; prolegs with 

 deep orange colored cushions. 



Pygsera gibbosa? Sm.-Abb. 



Found on oak on Prospect Hill, at Waltham, Sept. 2, 1848. 



Pale green, dotted with white, and with a white interrupted line on each 

 side of back above the lateral fold. Tail cover edged with pale yellow; 

 spiracles orange. Head round, somewhat rough ; mandibles deep yellow at 

 base; upper lip bifid, white; ocelli black, on a white curved line. Legs 

 equal, sixteen, rather short, green. Body green below, dotted with white. 

 The white dots on the back run together so as to form transverse, wavy lines. 

 Form like Abbot's figure. Does not raise head or tail when disturbed. 

 Length one and thirteen sixteenths inches. 



Pygeera ininistra Drury. [PI. n, fig. 4.] 



Larvae gregarious, on the apple tree. Figured August 30, 1820. The 

 eggs from which they proceed are laid on the under side of one of the last 

 leaves at the extremity of a branch of the apple tree, and are about one hun- 

 dred in number. At first the caterpillars eat only the cuticle of the under 

 side of the terminal leaves, but in a few days they are able to devour the 

 whole of a leaf, excepting the principal centre vein. They eat the leaf at 

 its edges, beginning at the base and proceeding towards the tip. The whole 

 body of the caterpillar is scantily covered with long, whitish, curved hairs. 

 When young and until about two thirds grown, the general color of the 

 body is brownish, with white lateral stripes, the three uppermost stripes on 



