68 MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 



with those of Cithenmia re<jal!><. which they most noiirly reseinl)le, those of Eaeles impcrinUs 

 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 tuberi'les (/). giv- 

 ing rise each to a single black seta, which is about a third longer than the tul>ercle. There are 

 thus eight setiferous tubercles on each segment (i-T), the lowest of which, one on each side, is 

 situated just above the base of the legs, and has a double l>ase (;•), sending off posterioi'ly at 

 nearly right angles to the main tubercle a small lateral one, which emits a l)lack bristle. Tubercle 

 // is also present, being about as high as / is thick at the liase. 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 long spinose tubercles, each ending in a black >)ristle. The dorsal median 

 tubercle on the ninth segment is bi-oader than long, being ti'ansverse, and Ijears two bristles. 

 The suranal plate is rather narrow, uuich narrower than long, and ending in two long, slender 

 tubercles, each bearing a diirk l)ristle, besides four otlier bristles on the plate. The anal legs are 

 provided with a dark patch on the side and bear below two long bristles, while there are three 

 black bristles on tiie base of each middle abdominal leg. There are sixteen (2)ossibly eighteen) 

 crochets on each of the abdominal legs. 



The l)ody in general is pale green, with a slight yellowish 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 inclosing 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 plant. 



Tlie larva, July 17. — Just before molting. Length, 7-!' nmi. (tig. 2). The head is now 

 small, Idack, one- half as wide as the body, which is tilled out from five days' feeding. The long- 

 est thoracic spines are scarcely one-third as long as the body, and all are pale reddish amber at 

 base and on the outer third, the terminal knobs being black-brown. The caudal horn is also pale 

 reddish amber at base. The dorsal tubercles of abdominal segments 1-7 bear a minute line at the 

 base l)ehind. Theie is now a definite, broad, white lateral stripe along the abdominal segments 

 (not appearing on the thoracic), which is bordered above by a dark, thread-like, brownish, spiracu- 

 lar line, inclosing the spiracles, which ai'e minute and difficult to detect. Above the spiracular 

 line is a linear distinct white line, and above this is the pale-green subdorsal stripe, diffusely 

 edged on each side with a darker tint. There is a median, small, rounded, amber-colored, dorsal 

 tubercle on the ninth segment, which is doulile, bearing two bristles. The end of the suranal 

 plate is reddish amber, liifui'cate and bearing black bristles (ffg. 2). There is a dark patch on 

 the outside of the anal legs. 



■Stage //— ]\Iolted July 18 and 19. Length, 10 mm. (fig. 3). The head is now high, 

 slightlj" angular on the sides; black-brown with a light brown or greenish lateral stripe on each 

 side, diverging from the light-green vertex to the antenna?, the two stripes var^ang from pale 

 brown to green. The gi'eat spines (both thoracic and caudal) are of al)out the same proportions 

 and colors as in stage I. except that the eight tlu)racic spines, which are still no shorter in pro- 

 portion to the body, being still one-third as long as the body, aj'e not so much swollen at the 

 end, the bulb being shorter and broader and the spines larger, making a more decided fork 

 (fig. 3, a), and thus resembling those of Eadt-s hnperiaJis. The setiferous tubercles on each seg- 

 ment are now rather large, conical, the two dorsal ones (/) large and stout, twice as large as the 

 subdorsal (//) and lateral ones, and all being lemon-yellow (less greenish than before), bearing a 

 terminal black spine, and with a second minute piliferous tubercle growing out from the side. 



The dorsal lines have almost disappeared, there being a subdorsal, pale, almost whitish line, 

 besides a faint, narrow, dorsal, greenish line. The lateral ridge is now prominent and bright 

 lemon yellowish, forming a distinct broken line, bearing in the middle of each segment a very 

 slender, blackish, piliferous wart. A dark reddish purple, narrow, si^iracular line. Between 

 this and the yellow line is a white stripe and another nari'ower ong above it, while still above is 



