150 ILLINOIS BIOLOGICAL MONOGRAPHS [150 



EXPLANATION OF PLATE I 

 Setal Maps. See page 147 



Fig. I. Hypothetical type showing the twelve primary setae. In addition three of 

 the more usual subprimaries are dotted in. The spiracle is shown in 

 both the prothoracic (a) and abdominal (b) positions. 



Figs. 2, 3, 4. Hepialus mustelinus, Hepialidae, Jugatae. Prothorax, mesothorax, 

 and third abdominal segment, first instar. Adapted from figures by 

 Dyar (1895b). 



Fig. 5. Hepialus humuli. Prothorax and mesothorax of mature larva. 



Fig. 6. Hepialus humuli. Abdominal segments i to 3 of mature larva. 



Fig. 7. Pseudanaphora arcanclla, Acrolophidae, Tineoida. Prothorax and meso- 

 thorax of mature larva. 



Fig. 8. Pseudanaphora arcanella. Abdominal segments i to 3 of mature larva. 



EXPLANATION OF PLATE II 



Setal Maps. 



Fig. 9. Typical mesothorax of Frenatae, labeled with Greek letters. 



Fig. 10. Typical proleg-bearing abdominal segment of Frenatae, labeled with 



Greek letters. 

 Fib. II. Typical mesothorax of Frenatae, labeled according to Dyar's system. 

 Fig. 12. Typical proleg-bearing abdominal segment of Frenatae, labeled according 



to Dyar's system. 

 Figs. 13, 14. Hepialus humuli, Hepialidae. Abdominal segments 6 to 10 of mature 



larva. (Tau and omega are transposed in Fig. 14.) 

 Figs. 15, 16. Pseudanaphora arcanella, Acrolophidae. Abdominal segments 6 to 10 



of mature larva. 



