Senotainia vigilans, 45 1 
Sericobracon arimaensis, 507 
SlTONITELLUS, 577 
Solenopsis invicta, 57 
Sericobracon evansi, 509 
Solenopsis, 91 
Sphecomyrma canadensis, 206 
Stonemyia, 1 1 9 
Substitute names for extinct genera, 575 
Swarming in a balloon-carrying empidid, 
287 
Tapinoma trochis, 34 
Tarantula-hawkwasps, 255 
Tool use in digger wasps, 309 
Trachysphyrus, 513 
Trachysphyrus aegla, 536 
Trachysphyrus agalma, 533 
Troglodidiplurqi lowryi, 1 5 1 
Trecela, 576 
Veromessor pergandei, 1 25 
Web-building behavior of spiders, 105 
Zacrytocerus, 337 
Zonosemata vittigera, 103 
590 
