144 



b. Thorax rugose with short isolated spines, abdominal segments 

 not spinose, but bearing a row of spines along both cephalic and 

 caudal margins of segments 1-7, the spines along the caudal 

 margin of segments 5-7 much longer than the spines of the 



cephalic row Basilona Boisduval. 



bb. Thorax and abdominal segments densely spinose ; abdominal seg- 

 ments 1-7 with a row of spines along both cephalic and caudal 

 margins, the spines in the cephalic row on abdominal segments 

 5-7 usually much longer than the spines in the caudal row ; 

 maxillae, measured on meson, one fourth the length of the wings, 

 c. Usually with prominent scattered spines on the thoracic segments, 

 at least four times as long as those covering the segments; an- 

 tennae with the central axis bearing a row of prominent spines 

 curved caudad ; if without prominent spines on the thoracic seg- 

 ments and antennae, then the maxillae are one third the length 

 of the wings. 

 d. Eighth abdominal segment never with a prominent transverse 

 ridge in the middle of the segment bearing a row of spines; 

 glazed eye-piece alwaj^s lighter in color than the remaining 

 surface of the body; species always more than an inch in 



length Adelocepliala Herrich-Schaeffer. 



dd. Eighth abdominal segment always with a prominent trans- 

 verse ridge in the middle of the segment bearing a row 

 of spines ; glazed eye-piece alwaj^s the same color as the re- 

 maining surface of the body; species never more than an 



inch in length Dryocampa Harris. 



cc. Without prominent scattered spines on the thoracic segments, 

 the longest never four times the length of those covering the 

 segments ; antennae with the central axis never bearing prom- 

 inent spines, the spines never curving caudad ; maxillae always 

 one fourth the length of the wings Anisota Hiibner. 



The following species were examined : 

 atheroma rcgolis Fabricius 

 Basilona impcrialis Drury 

 Adelocepliala hicolor Harris, bisecta Lintner 

 Dryocampa rubicunda Fabricius 



Anisota virginiensis Drury, stigma Fabricius, senatoria Smith and 

 Abbot, skinneri Biederman, consularis Dyar 



Family Saturniidae 



The members of this family have the antennae broadly pectinate 

 throughout, or nearly so, and the stem of the flagellum is usually dis- 

 tinct and raised above the level of the pectinations. The maxillae are 

 always short, never more than one third the length of the wings, and 



