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MEMOIRS NATIONAL ACADEMY OF SCIENCES. 



Vol. XII, 



brown band in front just below the vertex, making two scallops, and ending on the sides; on each 

 side (below) of the front edge of the clypeus is a dark spot around the base of the antennae, 

 which sometimes sends a short line inward, as in Mr. Bridgham's figure. 



The body is thick, full, cylindrical, each segment, except the prothoracic and last two 

 abdominal ones, with six thick, smooth conical tubercles, those on the sides above the spiracles 

 smaller than those below, and about one-half the size of the dorsal ones, and bearing fewer 

 bristles than the others. Prothoracic segment with only four tubercles, the two dorsal ones 

 low, flattened, and small, with about 14 radiating bristles. The lateral tubercles are like 

 those of the other segments; the rest of the dorsal tubercles are large, full, nearly touching 

 at their base, and bearing about 8 to 10 bristles, which are one-half to one-third longer 

 than the tubercles themselves; they radiate and are dark purplish, pale at base, those on the 

 back darker than those arising from the lateral tubercles. The second and third thoracic dorsal 

 tubercles are slightly larger than the abdominal ones. Each of the dorsal abdominal tubercles 

 bears about six bristles. The body is delicate pea-green, nearly like the under side of the 

 Carya leaf on which they feed. The tubercles, especially the dorsal ones, are tinged with faint 



straw or lemon yellow, while the lateral supra- 

 spiracular tubercles are greenish, scarcely 

 tinged with yellow. 



The bristles are longer in proportion to 

 the tubercle than in the larva of C. promethea; 

 most of them are three times and some four 

 to five tunes as long as the tubercle. The 

 bristles are sparingly and minutely barbed, 

 tapering acutely, but they are clear, and per- 

 haps glandular. 



The median dorsal tubercle on the eighth 

 uromere shows traces of its double origin, but 

 they are not so marked as in C. promethea and 

 T. polyphemus, but more so than in Platysamia 

 cecropia. It is much broader than long at base, 

 and on the tip bears five setae on each side. 

 The ninth uromere bears four tubercles of equal 

 size, which are large and well developed, the 

 lateral ones scarcely smaller than the dorsal ones. The suranal plate is broad and short, more 

 so than in T. polyphemus, not tubercled, but bearing two tufts of bristles which are but a little 

 shorter than those arising from the lateral tubercles of the rest of the body. 



The anal legs are large and squarish, as in the group generally; all the legs, both thoracic 

 and abdominal, are pale green. The abdominal legs bear each 20 crochets. The three tenant 

 hairs of the thoracic feet are rather longer than usual. The spiracles arc slightly chitinous, not 

 colored. 



The shape of the double dorsal tubercle on the eighth abdominal segment is shown at figuro 

 18, d'; sd, the subdorsal ones; a, a seta much enlarged, which, unlike T. polyphemus, is finely 

 and minutely barbed; a', a", ends of other setae. 



Stage II: Molted May 26, in the daytime. Length at first 9 mm., afterwards 10 mm. In 

 one larva all the tubercles are of the same yellowish hue; in the other, those of the second and 

 third thoracic segments are brownish at the tip, thus greatly contrasting with the others. In 

 another larva the median dorsal tubercle on the eighth uromere is also colored in the same way. 

 The head in one is all green, not yet banded with brown; but in another the head is partly 

 banded, i. e., in place of the two-scalloped band are two separate short scallops. 



The tubercles are now higher than before, and rough with slender conical warts which give 

 origin to the setae. The prothoracic tubercles are now longer than before, and all four are deep 

 amber-yellow at the end, the setae being black; two out of the five spines of the second and third 

 thoracic segments are dark brown at and near the ends and give rise to black bristles, rendering 



Fig. 18. — Tropsea luna; larva, first stage. 



