204 THE CANADIAN ENTOMOLOGIST. 



at both ends, and closely woven upon the outer coat, except at the upper 

 end, where the point of the outer cocoon extends above the inner one. 

 Length of cocoon, 1.80 to 2.15 in.; diameter .6 to .8 in. They are 

 attached longitudinally to twigs. The imagines appear at the end of May. 



" This species differs materially in colour from S. Cecropia. The male 

 has the antennae, palpi, thorax and legs much darker. The short grey 

 (or whitish) band on the hind part of the thorax is not found in .S*. Cec- 

 ropia. The discal spots of all the wings are white instead of dull red with 

 a white centre. The transverse bands of both pairs of wings are white, 

 instead of dull red bordered internally with white. It wants the broad 

 white band so conspicuous on the anterior border of the secondaries of 

 6". Cecropia, and also the reddish tints and markings -near the apices of the 

 primaries. 



" The female differs from that of S. Cecropia in having the palpi, legs 

 and abdominal rings dark brown, or almost black, instead of dull red. 

 The discal spots of the primaries are linear, obscure and parallel to the 

 transverse band, instead of broad, conspicuous and parallel to the costal 

 border. The discal spots of the secondaries are small, and almost round, 

 instead of large and somewhat triangular. As in the male, it has the 

 white on the hind part of the thorax, and wants the white on the anterior 

 border of the secondaries, and also the red on the apices of the primaries, 

 on the discal spots, and on the transverse bands. 



" The cocoon differs greatly from that of S. Cecropia. It is much 

 smaller and of a more regular form. It is dark brown, approaching black 

 in some places, with silvery spots; instead of uniformly light brown. The 

 inner and outer cocoons are so closely woven together, except at the very 

 top, as to be separated with difficulty ; while in S. Cecropia they are separ- 

 ated by quite a space filled with loose silk." 



Since the publication of Dr. Packard's " Synopsis of the Bombycidae 

 of the United States" in 1864, the genus Samia (Hubner) in America has 

 been restricted by Mr. Grote to a Chinese silkmoth, the Samia Cynthia of 

 Linnaeus, which has been introduced *into the United States, and has 

 become acclimatized there. Mr. Grote has erected the new genus 

 Platysamia (Broad Samia) for Cecropia, Columbia and Calif or nica (the 

 Saturnia Euryale of Boisduval, found in California). By this revision, 

 therefore, the species under consideration will in future bear the name of 

 Platysamia Columbia, S. I. Smith. 



