Xyletinus— X ylotrechus—Continued 
lugubris, 132 quadrimaculatus, 201 
peltatus, 132 sagittatus, 202 
Xylobiops basilaris, 134, 502 undulatus, 203 
Xyloblaptus quadrispinosus, 136 
Xylococculus betulae, 96 yellow jackets, 493 
X ylocopa— Yponomeutidae, 402 
micans, 498 
virginica texana, 498 Zabrachia polita, 421 
virginica virginica, 498 Zanolidae, 333 
Xylocopinae, 497 Zeiraphera— 
Xylophagidae, 421 diniana, 370 
Xyloryctes jamaicensis, 152 fortunana, 370 
Xylosandrus— ratzeburgiana, 23, 369 
germanus, 271 Zelleria haimbachi, 403 
zimmermani, 271 Zelus exsanguis, 65 
Xyloterinus politus, 264, 267 Zengophora scutellaris, 23, 144 
Xylotrechus— Zenillia— 
aceris, 201 protuberans, 332 
annosus, 203 vulgaris, 342 
colonus, 202 Zenodochium coccivorella, 396 
obliteratus, 202 Zeuzera pyrina, 23, 386 
642 
* U, S. GOVERNMENT PRINTING OFFICE : 19720 - 389-705 
