PLATE X. 



Pig, 1. Variety of nest of Pelopaeus coerulcus, showing lumps of mud 

 plastered on outside. 



Fig. 2. Vertical cell of nest of Pclojiaeus coeA'uleus. 



Fig. 3. Horizontal cells of nest of Pelopaens coeruleus. 



Fig. 4. Nervous system of Ilali/ctus. (After Marchal.) 



Fig. 5. Nest of Dlodontus ameriGanus, natural size. 



Fig. 6. Nest of Pompilus qulnqueaofafus, nearly natural size. 



Figs. 7-8. Examples of Epeira strix that have been paralyzed and 

 hung up on bean and sorrel plants by Pom^yilus quinque- 

 notafus, that they may be out of the way of ants while 

 she digs her nest. 



