MEMOIRS OF THE NATIOJS^AL ACADEMY OF SCIENCES. 219 



two thread lines which converge a little to meet the broad single band on the second and third 

 thoracic segments, and including the two concolorous tubercles, which arc dark at the tij), and are of 

 the same size but farther apart tlian those on the eighth segment. On the first abdominal segment 

 the red band breaks up into two subdorsal lines which pass into the blood-red, transverse, broad 

 band on the third abdominal segment, which extends down each side of the segment. On the 

 fourth and tifth segments are two parallel red lines, and on the sixth the broad single dorsal band 

 passes down on each side, forming a lateral lobe not quite so large or so full and rounded as that 

 on the third abdominal segment. This broad median, bloodred band contracts on the seventh and 

 •eighth segments, where it ends. The anal legs have a reddish line on each side. A fine irregular 

 lateral yellowish line passes along the lower end of the spiracles, and there are faint indications 

 of an upper lateral parallel yellowish line, which are most marked in front. 



Piliferous warts: None on the first thoracic segment; two minute dorsal ones, all of the same 

 size, on the second and third thoi'acic segments. Those on the first and eighth abdominal seg- 

 ments are large and equal in size: those on the second and third abdcminal segments are a little 

 larger than the others. The hairs on the dorsal warts are dark, those on the sides pale. 



Sfdf/e IV (?). — Length, 15 mm. About to molt. The head with its dark lateral lines as 

 before; the tubercles as before, but those on the first abdominal segment are rather larger and 

 ■more prominent than those on the eighth segment. The two lateral lines on the second abdominal 

 segment are much wider, so that the inclosed space is very narrow, and the broad transverse 

 reddish band on the third abdominal segment is interrupted in the middle by a whitish green 

 band which extends back more or less interruptedly to the seventh segment, on which it forms a 

 broad, green, oblong spot, the greeii edged with white and inclosing a median line. The reddish 

 band extends on each side of the ninth segment, and on the suranal plate is a lateral reddish, fine, 

 broken line and a median whitish line. The anal legs are much as before. Two well-defined 

 lateral yellow lines, while the body is more spotted along the whole length than before. The 

 spiracles are pale reddish. The thoracic and abdominal legs are green. This larva is much like 

 the drawings made by Bridghani (PL XXXV, fig. 3). It molted, after two days' rest, July 14; on 

 July 20 it began to pupate when 25 mm. long. 



Last stage. — Length, 25 mm. Head pale greenisL, with a single dark purplish curved line on 

 each side, not edged with white. Sides of the body greenish, speckled with reddish. (As the 

 markings are not yet distinct, a further description could not be made.) 



Full-fed larva. — One occurred on the elm August 30, at Providence (Bridgham); length, 27 

 mm. Head clear pale pea-green (not mottled with purplish), but the dark purple and white line 

 is present on each side. No broad purplish discal band, the space inclosed by the white lines 

 being whitish pale pea-green, and with a median white line beginning on the third thoracic segment. 

 The dorsal and lateral piliferous warts are yellowish. The two subdorsal white lines extend out 

 to the tip of the anal legs. 



A full-grown larva received from Miss Caroline G. Soule July 2-1, from Brookline, Mass., on 

 the 26th of July began to form a cocoon on tlie bottom of the breeding box. Length, 30 mm. 

 Head greenish, finely mottled and netted with purplish; a faint dark purple line broadly edged 

 behind with white. Two white subdorsal lines, very distinct on the abdominal segments and 

 inclosing a broad purplish dorsal baud, the two Hues finely and faintly edged with reddish i)urple, 

 and contracting a little on the somewhat humped eighth abdominal segment. The retractile anal 

 legs have on each side a reddish purple line. Tlie piliferous warts are all white, the hairs pale 

 brown. A single yellowish spiracular line, most distinct on the thoracic segments. A second one 

 not so distinctly marked aud wanting the white edging of the lines on the head. 



I have introduced these descriptions of Seirodonta hUineafa and very carefully compared the 

 alcoholic larviB with those of Hetcyocampa maiifeo without as yet being able to detect any difi'erence 

 between these, except that in some individuals there are but two segments red on the side, where, 

 as in II. manteo, there are three segments thus marked, though the moths differ in generic and 

 specific characters. 



On PI. XXXV ai'e represented the earlier larval stages of what I suppose to be this species 

 rather than any of Heterocampa, as it fed on elm leaves. It will be seen that in the earlier stages 

 •this genus is a Schizura rather than a Heterocampa, aud it is thus a connecting link between the 



