1893.1 [Packard. 



oval in outline, rounded in front, and behind slightly produced. The 

 head is pale pea-green, the mandibles dark, the labrum whitish. The 

 prothoracic segment is as usual without markings. The rest of the body 

 is divided longitudinally into three regions : There is a median, elevated 

 plateau-like region, bounded by a well-marked irregular ridge ; from this 

 ridge the body falls off rapidly on each side to the lateral ridge overhang- 

 ing the creeping disk ; the surface of each lateral region may be steeply 

 inclined or somewhat lioUowed out, as it depends on the movements of 

 the larva. The segments are defined by well-marked sutures. The skin 

 is very rough, the soft, fleshy rugosities standing well up, and the sides 

 ofthe body are finely crenulated. The body is pale pea-green, the gen- 

 eral tint being like that of the under side ofthe cherry leaf, but more yel- 

 lowish. The rough edge of the plateau, i. e., the two parallel ridges 

 bounding it, the surface of the plateau being level, and not hollowed, is 

 lemon-yellow ; these two lemon-yellow lines are wavy, and they connect 

 in front on the second thoracic segment ; but behind, on the last segment 

 of the body, they do not quite meet. Along the middle of the plateau is a 

 median series of eleven irregular roundish lemon-yellow spots centred 

 by a depressed wart, each situated on a suture. On each segment and 

 each side ofthe sutural spots, in the middle of each segment, is a pair of 

 lemon-yellow dots. On each of the lateral slopes of the plateau are four 

 rows of lemon-yellow spots, the highest and first being a row of minute 

 transverse spots situated on the suture. Below this row is a series of 

 large transverse oval yellow spots centred by a depressed dark-green 

 point. This row is succeeded nearer the edge by a row of yellowish dots, 

 two on each segment ; one, the smaller of the two, situated on each 

 suture. The fourth row is on the margin of the body, and is a broken 

 series of short lines. 



There is no red en the body. The end of the body is a rather narrow, 

 obtuse, slightly upcurved portion, being the end of the dorsal plateau. 

 There are no setae or coarse hairs above, but around the lower edge of 

 the body are sparsely scattered very short fine hairs. The spiracles are 

 situated just above the edge of the creeping disk. The dorsal setw of the 

 preceding stage are wanting in the final stage. 



A figure made for me, by Mr. Bridgham, of a larva found feeding by 

 Miss Morton, September 4, on the walnut, in probably next to the last 

 stage, represents bristles, distinct sutures, and the segments as convex, 

 features which are not indicated in the full fed worm. 



One example was ichneumoned. It will be noticed that in its last stage 

 this species loses its slight armature of minute bristles ; and it apparently 

 has no use for them, since I have been struck with the resemblance in the 

 shape and color of the larva to a simple sligh' fold in a leaf, so much 

 so that it might readily be mistaken for such a bend in the leaf by a pass- 

 ing bird ; and then the very sluggish motion of the creature would fur- 

 ther aid in the deception. 



