MEMOIRS OF THE IS^ATIOXAL ACADEMY OF SCIEXCES. 127 



abdominal segments are of tbe same color, but the other piliferous dorsal warts are yellow. There 

 are four jtarallel whitish yray dorsal lines, or rather three dark, livid-brown, flue dt)rsal lines 

 on a grayish wliite tiekl. 



Lant slage (PI. XV, lig. 1). — Length, 25 mm. Head brown black, flattened, as wide as the body ; 

 with graj' hairs. The pi-othoracic plate is widely divided into two transversely oval brown-black 

 plates. The body is marked with a broad, dorsal, ash-gray baud, containing three Vandyke brown 

 more or less broken lines. The sides of the body darker and containing two darker, irregular, 

 broken lines. On the first thoracic segment are no dorsal yellow warts, but two on each side, the 

 n])per one in fiont of the spiracle, button like, prominent. On the second and third thoracic 

 segments are four yellow tubercles, forming a transverse series. On the second to eighth abdom- 

 inal segments tbe yellow warts are arranged in a very low trapezoid, and the two anterior ones 

 are minute. Those on the ninth segment form a curved line. The suranal plate is broad and 

 rounded, speckled with hlaclc. There are no humps or specialized warts on the first and eighth 

 altdoiuinal segments, thus differing from the larva of /. indusa. The thoracic legs are blackish; 

 the abdominal and anal legs livid ash. 



The larva differs decidedly from that of /. iiiclnsa, though the moth is nearly allied. 



The moth bred from this caterpillar is of the dark mouse-colored foi'in, normal, usual in Maine 

 and Franconia, N. H. One like it from Illinois is in my collection. 



The following description is of a larva leared in Maine from eggs received from Jlr. Wilev. 

 of Miles City, Mont., and, as Dr. Dyar states, is '-the pale Western form," and perhaps var. 

 antorid- (Edw.). 



Life hisiorj/ of var. ornnta subvar. astorhc (PL XV, figs. 2, 3). — The eggs were kindly sent me 

 by Mr. C. A. Wiley, of Miles City, Mont.; they were deposited on the willow May 24. 18!l.>, and 

 were received June 5, but the larva had hatched out and must have been feeding several days, as 

 the body was filled out, the head not being quite so wide as the body. The larviB feed on the 

 underside of the leaf, and if transferi-ed to the upper side walk back beneath. 



Em/. — Diameter, 0.7 mm.; hemispherical or flattened conical, moderately high, very broad, 

 broader than high; the surface not regular, having an irregular meridional swollen portion, the 

 top being somewhat swollen. The surface is pitted as seen under a lens. Under a one-half-iuch 

 objective it is divided into slightly convex polygonal areas, with definite thin raised edges. 



The liole eaten by the larva for its exit is characteristic, being round, with the edge 

 crenulated, each concavity representing the incision made by the jaws; in some cases the disk cut 

 out is connected by a stalk with the side of the hole. 



Larnt, St<i(je I. — Length, 4 mm.; head black; body long and full, with the segments rather 

 full and convex, especially on the sides, particularly on the sides of the third abdominal segment. 

 The frsf and cightli ahdoiitiHul .segment)! fuller, more convex ihnn the others, and dor.snll)/ .sivolleii, 

 abnont humped, and dull, dark varnish or pitehy red, causing them to he very distinct in appearance 

 from, the other abdominal segments. Along the sides of the body is a broad longitudinal band of 

 tbe same pitchy red hue: it is most distinct and continuous on the abdominal segments, but 

 divided into two broken lines oti the upper edge, and it is a little broken on the three thoracic 

 segments, where it is most emphasized on the swollen sides of each segment, and wanting in the 

 sutures between the segments. The body is greenish yellow, and in the dorsal yellow portion 

 of tbe back are three faint broken parallel equidistant dorsal lines. On the side of the body 

 low down are three broken reddish brown lines, the lower one the broadest, and i)assing along 

 the base of tbe abdominal legs. The hairs are of unequal length, whitish. Protboracic plate 

 short and wide, black, distinct. Suranal plate broad, short, triangular, black. Thoracic legs 

 lilackish; abdominal legs (including the anal ones) pale greenish, the color of tbe body, but with 

 a dark chitinous callosity on the outside just above the plauta. 



Tlic larva molted June 14-L5. 



Stage If. — Length. <S-11 mm. Head flattened, small, not so wide as the body. A short, broad. 

 dark brown protboracic shield, not interrupted in the middle. The first and eighth abdominal 

 segments decidedly swollen above, almost humped; the color chocolate-brown, and concolorous 

 with the broad lateral band, which incloses two faint, pale, broken lines, and is often broken 



