232 



teristics, is a survivor of an ancient and very generalized type, and 

 represents, as no other known caterpillar , the polypodous ancestor of 

 all Lepidoptera. 



The lateral abdominal glandular processes. — Another 

 archaic feature in Lagoa is the presence of seven pairs of permanently 

 everted, finger-shaped processes on the first seven abdominal segments. 

 Fig. 1 represents a lateral view of the seventh abdominal segment, 

 vv^ith the dorsal [d)^ sd subdorsal, with their venomous setae , and long 



Fig. 1. 



Fig. 2. 





spinulated hairs, and i the infra-spiracular tubercle ; the lateral glan- 

 dular process at Igp, and situated behind and a little lower than the 

 spiracle sp. 



There are seven pairs of these metamerie processes; a pair to 

 each of the first seven abdominal segments. They are situated near to 

 and directly behind , but a little lower down than the spiracles , and 

 above the infra-spiracular tubercles. Indeed they occupy the exact 

 position of the evaginable lateral glands of Hyperchiria io and Hemi- 

 leuca maia, and other Hemileucidae. 



