MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 175 



Larra of first xt(i(ic, just after hatching. — July 2'). Leugtli, 3-4 nun. Tlie liead is very large, 

 nearly twice as wide as the body beliiud tbe middle, rounded, and with a fine, narrow black stripe 

 along- the hinder edge; it is honey-yellow, with scattered black hairs. Body moderately slender, 

 gradually diminishing in width to the end, the anal legs being long and slender, larger than in the 

 young of Schizui-a. They are forked, long, and slender; the terminal third evaginate, nearly as 

 large at the end as at the base, and are held lifted up, together with the two preceding segments, 

 at an angle ot about 45 degrees. The claws are entirely absent, the tip being soft, retractile, and 

 extensile, and the leg itself being provided with 12-13 stiff, dark, acute seta'. They differ but slightly 

 from those of the fully ied caterpillar. The end of the leg is retracted by three slender retractor 

 muscles, one being single, tlie two others united near their insertion into the retractile portion. 



The other abdominal legs are provided with a semicircle of ten hooks each, the inner two 

 hooks of one set being \ery short. All the legs, both thoracic and abdominal, are dull greenish. 

 The body is deep pea green, the surface shining. The first abdominal segment shining red, with 

 two slender, papilliform, uoupiliferous subdorsal deep red tubercles, situated in or just below the 

 subdorsal lines. There are two similar but much smaller piliferous red warts on the eighth 

 segment. Body behind the head with live red or reddish black lines; the single dorsal and the 

 two subdorsal lines narrow, nearly continuous, scarcely broken. The lateral line is slightly 

 interrupted like the others at the sutures. Below the spiracles is a much interrupted line of 

 heavier dark red, somewhat curved or sinuous slashes, situated at the base of the legs, becoming 

 less distinct behind the fourth pair of abdominal legs. 



The hairs are stiff and black, mostly thick and clavate, and pale at the extreme t\\). Those 

 on the head are slightly knobbed. On the prothoracic segment is a. chitinous plate or shield IVom 

 which arise four of these hairs, of which two are about one-third longer than tliose of the meso- 

 and metathoracic segment; they are about as long as the body is thick; those on the second, 

 third, and fourth abdonn'nal segments are larger and longer, more distinctly clavate than those 

 elsewhere; they are smooth, black, but clear and colorless at the extieme tip. 



Second stage, after first molt. — July 28. Length, (J-7 mm. The head is now more distinctly 

 amber colored and smaller in proportion than before. Body i^ale green, the dark brown stripes, 

 espei-ially the dorsal one, being more distinct; the dorsal line is continuous, the two lateral ones 

 somewhat broken. The hairs are black, not so much club shaped as before. The markings show 

 little change from the first stage, but the reddish first abdominal segment has grown paler. The 

 tubercles on the eighth abdominal segment have each lost their single hair. 



Third .stage, after .second molt. — August 5. Length, 15 mm. The larva has now dropped the 

 club-shaped sette, or "glandular hairs," all the hairs being minute, tapering, and very short, while 

 the lateral humps on the eighth segment are decidedly larger than before and marked with two 

 parallel reddish brown lines, so that in respect to these humps tlie characters of the fully grown 

 larva are nearly assumed, while the tubercles on the first segments are still slightly larger in 

 proportion than in the mature larva. 



The head is of moderate size, but little wider than the body, rounded, and orange-reddish. The 

 body is smooth and sliining, straw yellow, the line blackish; the dorsal black line ends on the 

 smooth black knob on the eighth segment. The three lateral black lines are more or less 

 interrupted, situated in a broad whitish band, tlie middle line being the faintest, which incloses 

 on the first abdonnnal segment a jet-black tubercle. Low down is an infrasijiracular row of 

 twelve black spots situated at the base of the legs, when present. There are four black sjiots on 

 the front part of the suranal plate, while the double reddish black slashes on the lateral humps of 

 the eighth abdominal segment are more pronounced than in the earlier stages. The extensile, 

 ui)lifted anal legs are black at the tips. 



. Fourth stage, after third molt. — August 10-11. Length, 22-24 nmi. In this stage the larva only 

 dift'ers from the preceding one in the deeper, more distinct colors of the body and its markings, 

 while the body itself is larger and thicker. The black tul)ercles on the first abdominal segment 

 are slightly smaller than before. 



Fifth .stage, fidlgfed larva. — Length, 55 mm. Head rounded, greenish amber; body smooth, 

 of nearly unitorm thickness, with a low rounded jet-black knob on top of the eighth abdominal 

 segment, in front of which is a narrow black dorsal line; anal legs very slender, uplifted. Three 

 lateral black lines close to each other and forming a broad, dark, wavy band. Base of all the legs 

 blaisk, but the legs themselves pale; ground color of body, deep pink', fiesh color. Differs from 



