PLATE X. 



Fig. 1. Variety of nest of Pclopaeus cocruleus, showing lumps cf mud 

 plastered on outside. 



Fig. 2. Vertical cell of nest of Pelopaeas coeruleus. 



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



Fig. 4. Nervous system of Halyctus. (After Marchal.) 



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



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



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

 hung up on bean and sorrel plants by Pompilus quinque- 

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

 she digs her nest. 



