1893.] 14:9 [Packard. 



ble movable spines, nearly two thirds as long as the body, ■which open 

 and close together like great arms, spreading apart, or directed forwards 

 and outwards more or less constantly while walking, the creature at this 

 age being rather active ; they are evidently at this period defensive 

 organs. They are stout, thick at the base, those of each pair close to- 

 gether at their base ; they slowly taper towards the end, and are armed 

 with 12-14 short, thick, blunt, dark spines ; at the end of the spine is a 

 remarkable bulbous expansion somewhat chestnut-shaped, being a little 

 flattened and subtriangular, broad at the end, from each side of which 

 arises a small slender tubercle bearing a blunt, stout spine about a 

 third longer than the tubercle. The appendages themselves are dark 

 chestnut, pale amber at base and on the outer third, but the bulbous tip 

 is dark reddish black. Those of the third thoracic segment are very 

 slightly shorter than the pair in Iront and in each pair the outer spine is 

 the shorter. These horn-like appendages are flexible, especially near the 

 end, and are sometimes bent over and around so as to form a decided bow 

 or curve, or even a nearly complete circle. Compared with those of Githe- 

 Tonia regalis, which they most nearly resemble, those o^ Fades imperialis 

 being forked at the end, the bulbous tips are a little longer, but still of 

 the same general shape and size. 



Along the abdominal segments are six rows of very long and slender 

 conical tubercles, giving rise each to a single black seta, which is about a 

 third longer than the tubercle ; there are thus six piliferous tubercles on 

 each segment (1-7), the lowest of which, one on each side, is situated just 

 above the base of the legs, and has a double base, sending off posteriorly 

 at nearly right angles to the main tubercle a small lateral one, which 

 emits a black bristle. 



On the eighth segment is a very large, stout, acute, bright-red horn, 

 which is borne either erect or directed a little forward ; it ends in two 

 long, slender tubercles, each bearing a bristle about as long as the tubercle, 

 and along the trunk are several large spinose tubercles, each ending in a 

 black bristle. The dorsal median tubercle on the ninth segment is 

 broader than long, being transverse, and bears two bristles. The suranal 

 plate is rather narrow, much narrower than long, and ending in two long 

 slender tubercles, each bearing a dark bristle, besides four other bristles. 

 The anal legs are provided with a dark patch on the side and bear long 

 bristles, while there are three black bristles on the base of each middle 

 abdominal leg. There are sixteen (possibly eighteen) crochets on each of 

 the abdominal legs. The body in general is pale green, with a slight yel- 

 lowish tinge. 



There is a median linear dorsal line along the body, and on each side 

 are four narrow dark lines on a green ground, the two middle lines being 

 diffuse, and enclosing a dark band and bearing a row of bristles. The 

 freshly hatched larva spins a silk thread, which after a while is annoying 

 to the observer from its being in the way and adhering to the leaves of 

 its food plants. 



