1916] Classification of the SatiirniidcB 155 



blunt tip, in ventral view the scars of the anal prolegs distinct 

 on each side the anal plate; cremaster absent. Length, abdo- 

 men retracted, 30-35 mm., expanded, 35-40 mm.; girth, 

 45-50 mm. 



Genus Philosamia Grote. 



Face parts slightly elevated ; antennae pectinate throughout, 

 tapering gradually to a point at the distal end, the stem of the 

 flagellum distinctly raised above the level of the pectinations 

 and nearly one-third the total width of the antennae, similar in 

 the sexes ; glazed eye-pieces visible in both sexes ; invaginations 

 for the anterior arms of the tentorium distinct; clypeo-labral 

 suture indistinct; maxillae, measured on the meson, about one- 

 third the length of the wings; tips of first and second pairs of 

 legs adjacent on the meson; median thoracic line distinct on 

 all segments; caudal part of mesonotum and metanotum 

 depressed adjacent to wings; wings with their distal margin 

 raised above the dorsal surface of the body; first wing with its 

 anal angle broadly rounded, opposite the second abdominal 

 spiracle; second wing generally visible along the entire dorsal 

 margin of first wing, its margin wavy, produced into a prom- 

 inent anal angle reaching the caudal margin of the fourth 

 abdominal segment; abdominal segments 8-10 tapering rapidly 

 to form a blunt or truncate cone; cremaster absent. 



This genus contains a single species, Philosamia walker i, 

 which is a native of China and was introduced into America 

 from Europe. At first it was confined to the Atlantic Coast 

 States, but is gradually spreading westward. The cocoons are 

 on an average two inches long, half an inch wide and pointed at 

 the caudal end. The cephalic end is open with a valvular 

 arrangement of loose fibers of silk. The cocoons are encased in 

 a leaf and suspended from the twigs by a band of silk spun over 

 the petiole of the leaf holding it to the stem. The cocoons are 

 pale gray or grayish tan in color and closely resemble the 

 cocoons of C. promethea. 



Philosamia walked Felder. — (Fig. 14). Color generally yel- 

 lowish brown, darker on wings and dorsum; exposed surface of 

 thorax and abdomen with fine, indeterminate, transverse stria- 

 tions; antennae reaching half way between the tips of the first 

 and second pair of legs; labrum short and broad, its width 

 usually six times the length; maxillae triangular in outline, 



