MEMOIRS OF TUE iMATIOXAL ACADEMY OF SCIENCES. 
205 
''Unicornis, This appears to be a climatic variety, following the same law of climatic variation as 
we have already referred to. 
Gvenuisli to yellowish gray in color; transverse diameter, S inm.; hemispherical, not 
flattened; surface under high ])owei', v'ith elevated ridges forming facets. A slight irregular 
roughening occurs about the niicropylar region.-’ (*0)eposlted in captivity in Feb.” Riley IMS.) 
Xurm. — The first stage of S, unicornis differs but slightly from that of S. ijwmea’. Length, 
2 inui. The head and body are of the same pro])ortions, the prothoracic tubercles of nearly the 
same size, but those on the back of the ineso- and metathoracic segments are larger than in 8, 
unicornis. The tubercles on the abdominal segments are of nearly the same proportions, but 
slightly larger. 
The first, third, and eighth abdominal segments are briglit red in unicornis as in ipomew., and 
the colors and markings in general scarcely different from those of ipomecv. The anal legs are the 
same in size and position in the two s])ecies, but the tubercles are on the whole larger in ipomeie. 
The hairs are clavate in ^inicornis and of the same proportionate length as in ipomew. 
It thus appears that no genuine specific differences exist between the freshly hatched larvae 
of 8. ipomew and unicornis and most probably leptinoides^ though the caterpillars are so diffei'ent 
when fully fed. On the other hand, though Ave do not know the earliest stages of the other species 
of Schizura, yet from our knowledge of those of J)asyIophia anguina there seems little doubt that 
the generic characters are cpiite clearly indicated in the first stage; that is, it Avill always be easy 
to separate Schizura larvie just after hatching from those of any other genus of Notodontians, 
while if specimens of 8, ipomew and unicornis of the first stage were mixed together it would be 
almost impossible to safely separate them according to the species, the inci])i8nt specific characters 
actually existing being too slight and indecisive. 
Length, 20 mm. Body much compressed; head not so Avide as the body, compressed, flattened 
in front, elevated tOAvard the vertex, cleft, ending in tAVO rounded conical tubercles, pale rust-red, 
densely marbled with a fine net-work of darker lines. Body pale rust-red, Avith a pale pea-green 
]»atch oil the side of the second and third thoracic segments, not reaching to the anterior spiracle. 
First abdominal segment Avith a large high acute conical tubercle, bearing at tip tAVo very 
slender, sjireadiug, brown cylindrical tubercles. On fifth a slight hump, bearing two small 
Avarts; eighth segment bearing a rather large dorsal hump, supporting two dark warts; in front is 
a broken V-shaped silver mark, the apex directed forward. Anal legs brown, held out, Avith end 
of body, horizontally. Three lateral obscure, oblique lines connecting Avith a dark, obscure, lateral 
straight line placed some distance above the spiracles. Feet all rust-reddish, thoracic feet paler. 
Length, 25 mm. lias a shorter smaller dorsal retractile tubercle than in 8, ipomew. Thoracic 
segments pea-green; the dorsal V-shaped mark on the seA’enth segment is prolonged to the front 
edge of the sixth segment, this part really forming a separate narrow V, in front of the apex, of 
Avliich on fourtli and fifth segments each is a dusky broAvu patch, between the reddish brown 
piliferous warts. 
Before the last molt the larva is the same as the mature form. Length, 15 to 18 mm. 
The dorsal hump is not so soft and retractile or sensitive as in the larAm of 8, leptinoides. 
“ It is a very singularly shaped caterpillar. General color in sound specimens, rich reddish 
brown, in others grayish brown, shaded with A’ery minute vspots of a darker color, Avhich give it a 
shagreened appearance, A faint line of a darker color runs along each side from the third segment. 
It is Variegated on the back Avith a lighter color, somcAvhat in the shape of a letter W as one looks 
from the head, and two lines forming a Y mark. 
“Lar\m found on the blackberry AA'ere mostly very pale, Avith the Avhite Y mark on joints 9 
and 10 Amy i>lain, with much glaucous color about the back, and AAuth the other shades of juxrple- 
brown, flesh-brown, olive and pale green, Avhich are found on the withering blackberry bushes, 
all present. The glaucous and brown colors are especially noticed on the canes of this plant.” 
(Riley in Fifth Rep. U. 8. Ent. Comm., p. 260.) 
Cocoo7i . — “Thin and almost transparent, resembling parchment in texture, and (covered generally 
with bits of leaA’es on the outside” (Harris). The larva s^iins a silk cocoon Avith the debris on the 
outside, judging by a specimen in the United States National Museum. 
