141 



of its length, often much wider, and the antennae seldom extend 

 farther caudad than the prothoracic legs. There is a marked differ- 

 ence in the sexes, the antennae of the male being much broader, some- 

 what longer, and often meet on the meson, covering nearly all of the 

 appendages except the wings. The legs are shorter than in most super- 

 families, the prothoracic and mesothoracic legs usually either meeting 

 or lying adjacent on the meson. The maxillae never reach the caudal 

 margin of the wings, and their greatest length is not more than one 

 third the length of the wings, but they are usually much shorter. The 

 mesothoracic wings always lie adjacent on the meson and the meta- 

 thoracic wings are often visible on the meson in the Saturniidae. The 

 family Ceratocampidae has a row of' broad triangular spines set on 

 the edge of a flanged plate along both cephalic and caudal margins of 

 the movable abdominal segments. They usually possess very long 

 cremasters, which are always bifurcate at the distal end. The Hemi- 

 leucidae have short cremasters, while there are none present in the 

 Saturniidae and few of the genera have spines at the caudal end of 

 the body. 



A paper on this superfamily, giving tables for the identification of 

 families, genera, and species has been prepared and the first part, 

 ''The Classification of the Pupae of the Ceratocampidae and Hemi- 

 leucidae," was published in the Annals of the Entomological Society 

 of America, Vol. 7, 1914, pp. 277-300. The manuscript for the re- 

 mainder is now in the hands of the editor of the same journal. The 

 following tables of families and genera and the descriptions, with some 

 slight additions and corrections, are taken from the paper mentioned 

 above. The generic names in Dyar's list are used, but the genera are 

 not arranged to indicate natural relationships. The superfamily 

 Saturnioidea may be divided into three families as follows : 



a. Pupae with, the movable segments provided with, flange-like plates 

 which prevent their being telescoped, their lateral margins distinctly 

 tapering caudad and each segment noticeably smaller than the seg- 

 ment cephalad of it; wings never elevated dorsad above the surface 

 of the body ; a distinct cremaster always present ; stem of the flagel- 

 lum of the antenna never elevated and distinct. 



b. Pupae with a distinctly bifurcate cremaster ; body usually rough- 

 ened with spines on the exposed surface of the thorax and abdo- 

 men; metathorax with prominent oblong tubercles on each side 

 of the meson extending one third or more of the distance between 

 the meson and the margin of the first pair of wings ; pupae always 



found in the ground Ceratocampidae. 



bb. Pupae without a distinctly bifurcate cremaster; body never 

 roughened with spines on the exposed surface of the thorax and 



