MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 281 



very opaque, traclieal liue cvideut. As the stage advances bumps appear sliglitly ou all the 

 interveuing segments aud the larva more nearly resembles the last stage. 



Stai/e I r. — Head higher than wide, narrowing to vertex, flattened in front; green, the clypeus 

 shining, a black liue as before; width, li.l mm. Dorsal processes as in the mature larva, but much 

 slighter; present on segments 5 to 12 aud a slight one on 13, consisting of two small tubercles. 

 The processes are all small, except ou segments 6 and 12. Markings as before, but more distinct; 

 and approaching the mature larva. All the mature characters are now assumed, but are less 

 developed than in the next, wliicli is the last stage (Stage V). (Dyar MS.) 



iStaije V. — The following description was drawn up October 5, from the three specimens figured 

 ou PI. XXIII. They were kindly sent me by Miss Mary Murtfeldt, from Kirkwood, Mo. 



Length, 32-33 mm. Bodj' much compressed. Head moderately large, rather narrow and 

 high, slightly bilobed above, not so wide as the body; pale green, with four broad white bauds in 

 front and on the side, the two median ones approaching each other over the apex of the clypeus, 

 aud then separating. Behind, a white band ou each side passes down underneath the back of tlie 

 head, making six white bands in all. On each side of the front is a narrow, blackish line, edging 

 each lateral frontal line. 



The tliree thoracic segments of nearly the same size and width, much wrinkled, but nnarmed, 

 and with three white longitudinal bands on each side, the lower one narrow, irregular, and edging 

 the lateral conspicuous infrastigmatal purplish liue. 



Abdominal segments 1 to 8 with a high recurved, soft, fleshy, distinctly retractile, conical 

 tubercle, the apex of which is bilobed aud curved over backward so as to touch the apex of a 

 second nuich smaller conical tubercle, the first one being a little smaller than the others, and the 

 last oue a little slenderer than the others. On the tip of each tubercle is a reddish brown median 

 liue, best marked on the secoTul aud third tubercles, the other being simply tipped with the same 

 hue. The sides of the tubercles aud of the segments bearing them is glaucous-white, and from 

 the anterior part of the base of each tubercle a green line passes obliquely backward and down- 

 ward to the suture behind. There are eight of these lateral oblique lines; the eighth is a little 

 higher than the seventh, is piliferous, bearing a short hair on each side. Ninth abdominal segment 

 not tuberculated, but with a pair of snudl dorsal tubercles. Suranal plate narrow, (]uite smooth, 

 and with four longitudinal white bands. Low down on the sides of abdominal segments 7 to 9 is 

 a broken infrastigmatal purplish liue which extends along the underside of the rather slender 

 anal legs. Spiracles yellow, with a dark, narrow edge. Distal ends of the four pairs of middle 

 abdominal legs purplish, with two ])arallel black lines above the planta. Thoracic legs pale green, 

 with a narrow dark red line on the outside. 



There is not much variation in the three iudividuals, except that the purplish lateral line in 

 one is represented on the abdominal segments by isolated spots. The tubercles are unusually 

 extensile and flexible in this caterpillar, and their resemblance to the serrate edge of the elm 

 leaves, together with the leaf-green ground color and greenish white markings, aud i)urplish 

 brown spots like those on the elm leaves, is most remarkable. 



Habits. — The larva eats away the leaf from the midrib, leaviug the latter as a " i)erch," on 

 which it rests just like Lophodonta. When large the larva rests ou the base of the leaf or stem. 

 (Dyar.) 



FULLY GROWN LARVA OF HYPARPAX AURORA (See p. 186). 



Lufft stage { V). — Like Stage IV at first. Later and gradually the colors change. Head rounded, 

 higher than wide, not reaching above segment 2 nor retracted within it; width, 3 mm. Ground 

 color white with a yellow tint, reticulated with mottled bands of purple-brown, a broad one 

 running from antenna^ to top of each lobe. Body pointed dorsally. On segments 5 and 12 the 

 tubercles i red, large, conspicuous, elsewhere very small, though i on segments G-8 are white and 

 rather distinct. All other tubercles inconspicuous, sette dark, moderately long. Venter aud legs 

 purple-brown, dotted with white; sides whitish greeu, finely dotted with white and brown aud 

 shading into a brighter green on segments 2-1 (representing the usual patch of Schizura and 

 Janassa). On segments 2-3 a dorsal purple-brown band, white dotted and bordered with yellow; 

 on segment 5 a white subdorsal band marked with fine irregular purple-brown lines, beginning at 

 tubercle i, loops up to i ou 12 and runs to anal foot. The dorsal space thus inclosed is bright 

 yellowish leaf-green, dotted with white, with a narrow white dorsal line indicated. Tubercle i on 

 segmeut <> is marketl by a little white i)atch, and there is a triangular enlargement of the subdorsal 



