200 MEMOIRS NATIONAL ACADEMY OF SCIENCES. vol. xii, 



The metallic silvery spots on the outer side of the dorsal tubercles glisten and shine when 

 the larva moves, and appear to serve as a warning feature. At first, in this stage they are no 

 larger than hi the previous stage, but soon after ecdysis the striking ornaments rapidly enlarge 

 both on the dorsal and lateral tubercles, becoming larger and more conspicuous, much as in the 

 full-fed larva. 



The battledore-like white setse are more conspicuous than before. On the second and third 

 thoracic and first abdominal segments is a small oblique black spot extending from the spiracle 

 upward along the outside of the lateral tubercles. A black ring at the base of the thoracic legs. 

 The ends of both thoracic and abdominal legs are flesh-reddish. The stiff thick hairs on the 

 base of the abdominal legs are black. 



The median tubercle on the eighth abdominal segment is still wider than long seen from 

 above, with four long hairs on each side. Some of the long pale green hairs arise along the back 

 near the tubercles, with them occur other minute ones; they all arise between and near as well 

 as outside of the base of the tubercles. 



The larva molted October 20 and stage V was described on the 22d. 



Stage V: Length 35-40 mm. The golden marks were not very distinct at first, but became 

 more so on the second day. Body bright pea-green, paler above than below. Head pale ash- 

 brown, with a black-brown V-shaped mark hi front (the edge of the V-shaped clypeus being 

 black-brown), with a short black line on each side; also eight black spots on the front of the 

 head, six above the clypeus; and one not far from the front edge of the clypeus. There is also a 

 faint broad dark shade on each side of the head. 



Body thick, the segments very convex and angular. The attitude of the larva at times 

 is perfectly sphinx-like, the head being held upward and backward hi the well-known position. 

 Prothoracic dorsal plate green edged with yellow. No tubercles, but hi place of them vestigial 

 flattened ones, two on each side, each givhig rise to 4 dark hairs, and other shorter hairs. The 

 dorsal tubercles of the second and third thoracic segments large and high, conical, both pairs 

 of the same size, those of the first abdomhial segment a little smaller, while those on segments 

 2-7 are about one-half as large as those hi front; the median one on the eighth abdominal 

 segment is about as large as those on the second and third thoracic segments. On these tubercles, 

 as in stage IV, the setae arise from the front portion of each tubercle, they are brown ha color and 

 still very long — two-thirds as long as the body is thick — and still end hi a distinct bulb, which, 

 however, is shorter than in the adult ; arising on the hinder side of the extremity of each tubercle 

 are 3-4 stout curved spines. The median tubercle on the eighth abdominal segment is yellow 

 and still wider than long, showing signs of its fused or double origin in a slight median impressed 

 line; this tubercle bears no spines, but four long curved setae. Other setae are scattered between 

 and outside of the dorsal tubercles and they are green still, as in stage IV. 



On the outside of the dorsal tubercles of the first and second abdomhial segments the 

 bullate tense brilliant pearl -silvery spots are now very distinct; those on the abdomhial segments 

 behind much smaller and indistinct. Three of the tubercles of the supraspiracular row are 

 rather larger than on the third segment, being but little smaller than those hi front, and they 

 cover more of the tubercles, only the inner aspect being green. Infraspiracular row of 11 tuber- 

 cles small, but of a beautiful turquoise blue tint, with long radiathig brown hair-like setae. A 

 still lower row of three turquois blue tubercles on the thoracic segments, one on each segment, situated 

 just above each pair of thoracic legs. 



Spiracles black, except the first (on first thoracic segment) and last (on eighth abdominal), 

 which are brown, with the median slit-like opening yellowish-brown. On the abdominal seg- 

 ments 5-7 an oblique dark streak above the spiracles. 



Lateral spiracular line of a delicate orange-red, becoming brownish on the ninth abdominal 

 segment, and greatly widening on the edge of the suranal plate and farther expanding on the 

 anal legs; the hue of this line or band is much as in that of the leaf stalks of the oak, though less 

 reddish, but the protective resemblance is similar to that observed in the larva of Telea poly- 

 phemus. The lower side of the brown area is shaded with white. The body is also thickly 

 sprinkled with the white battledore-shaped setae, especially near the spiracular region. The 



