42 DONALDSON BODINE. 



D. Pectinations scaled on dorsal aspect LACOSOMID^. 



DD. Pectinations not scaled LASIOCAMPID^. 



BB. Pectinations dorsal SATURNHNA. 



AA. Antenna clavate or falcate. 



B. Clavola usually prolonged beyond the club, segments with some ventral 

 expansion, often causing a recurving of the clavola beyond the 



club HESPERIINA. 



BB. Clavola not prolonged beyond the club, segments without appreciable 

 ventral exjjansion PAPILIONINA. 



The most generalized antenna of this group belongs to the family 

 Lacosomidaa. It bears a close resemblance to the antenna of the 

 Bombycidse and the Lasiocampidae. In all three families the pecti- 

 nations are long and slender, and arise from the ventral a,spect of 

 the segments. They are abundantly supj)lied with hairs of the 

 third type and have pits along the dorsal aspect, especially near 

 the apex of the pectinations. In the Lacosomidse the pectinations 

 are scaled, and there are fewer pits along the dorsal aspect. A 

 study of the antennae alone would lead to the belief that the Bom- 

 bycidse were more closely related to the Lacosomida; than to the 

 other Saturniina. In fact, there is such a wide difference between 

 the antennse of the first and those of the last two families of the 

 Saturniina, that the first family would not be placed in the same 

 superfamily were the classification based on those organs. The 

 superfiiniily as now constituted includes the Bombycidie, Hemileu- 

 cidae, Citheroniidie and Suturniidie. The antennte of the members 

 of the grouj) may be separated by the following table : 



SATURNIINA. 



A. Pectinations ventral, single ])air to a segment BOMBYCID-^. 



AA. Pectinations dorsal. 



B. Single pair to a segment HBMILEUCID-^. 



BB. Two pairs to a segment. 



C. Distal portion of clavola filiform CITHERONIID^. 



CC. Qavola pectinate throughout SATURNIID.ZB. 



The Bombycidic are the least specialized of the Saturnians, and 

 probably represent a branch which long ago separated from the one 

 that produced the other families. The pectinations are well devel- 

 0})ed, but they are ventral, and there is only a single pair to a seg- 

 ment. The pectinations are well sup[)lied with hairs of the third 

 type, and the shaft also bears them for the width of the space be- 

 tween the bases of the pectinations. A rather unexi)ected fact is 

 that the antenme of the female are nearly as well developed as those 



