113. The female black widow spider, 

 Latrodectus mactans. wears a bright red 

 hourglass mark on the underside of her 

 spherical black abdomen. She defends 

 her nest with a bite that is dangerous to 

 man. (Texas. Andreas Feininger) 



111 and 112. Some spiders make a specialty of hunting for prey below the surface of ponds. Dolome- 

 des carries a film of air caught in hairs over the body as it dives ( abo\e ) , but sheds the water quickly 

 upon returning to air with a victim (below). (William H. Amos; and John Gerard: National Audubon) 



