MEMOIRS OP THE NATIO^TAL ACADEMY OF SCIENCES. 281 



very opaque, tracheal liuo evident. As the stage advances humps api)ear slightly on all the 

 iuterveuiug segments and the larva more nearly resembles the last stage. 



Sfiu/e IV. — Head higher than wide, narrowing to vertex, flattened in front; green, the clypeus 

 shining, a black line as before; width, 2.1 mm. Dorsal processes as in tlic mature larva, but nuich 

 slighter; present on segments 5 to 12 and a slight one on 1.3, consisting of two small tubercles. 

 The processes are all small, except on segments G and 12. Markings as before, but more distinct 

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

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



StMje V. — The following descrii)tiou was drawn up Octol)er i"), from the three siiecimens figured 

 on PL XXIII. They were kindly sent me by Miss Mary Murtfeldt, from Kirkwood, Mo. 



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

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

 front and ou the side, the two median ones approaching each other over the ajjcx of the clypeus, 

 and then separating. Behind, a white band on 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 three thoracic segments of nearly the same size and width, nuich wrinkled, but unarmed, 

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

 the lateral conspicuous iufrastigmatal purplish line. 



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

 tubercle, tlie apex of which is bilobed and 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 one a little slenderer than the others. Ou the tip of each tubercle is a reddish brown median 

 line, best marked on the second and third tubercles, the other being simply tipped with the same 

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

 the anterior part of the base of each tubercle a green line passes obli(iuely backward and down- 

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

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

 not tuberculated, but with a pair of small dorsal tubercles. Suranal plate luirrow, quite smooth, 

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

 a broken iufrastigmatal purjilish line which extends along t!ie 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 jiarallel black lines above the j)lanta. Thoracic legs pale green, 

 with a narrow dark red line ou the outside. 



There is not much variation in the three individuals, 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 greeuish white markings, and purplish 

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



Habits. — The larva, eats away the leaf from the midrib, leaving the latter as a "perch," on 

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

 (Dyar.) 



FULLY GEOWN LAEVA OF HYPAEPAX AUEORA (see p. 180). 



Last stage ( T).— 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 ])urple-browu, a broad one 

 running from antenme to top of each lobe. Bodypointed dorsally. Ou segments ~> and 12 the 

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

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

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

 shading into a brighter green on segments 2-4 (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 ."> a white subdorsal band nuirked with fine irregular i)urple-l)n)wn lines, beginning at 

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

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

 segment <J is marked by a little v.hitc patcli, and there is a triangular enlargement of the subdorsal 



