INDEX TO ILLUSTRATIONS. 
Agapostemon, modification of hind leg of, fig. 25, 
e, p. 359. 
Anthophora, modification of hind leg of, fig. 25, 
a, p. 359. 
Aphelinus diaspidis, fig. 9, p. 233. 
Aphycus immaculatus, fig. 11, p. 236. 
Apis- mellifica, wax disks of, fig. 23, a, b, p. 356; 
modification of hind leg of, fig. 24, A, p. 357. 
Apple branch with San José scale, fig. 27, p. 367. 
Aspidiotiphagus citrinus. fig. 6, p. 229. 
Bees, modifications of hind legs of, fig. 24, p. 357; 
fig. 25, p. 359; wax disks of, fig. 23, p. 356. 
Bombus, modifications of hind legs of, fig. 24, C, 
p. 357; wax disks of, fig. 23d, p. 356. 
Chelonus electus, female, fig. 31, p. 372. 
Chelyoxenus xerobatis, fig. 19, p. 309. 
Chineh bug, map showing area ravaged by, fig. 
4, p. 151. 
Coccophagus aurantii, fig. 7, p. 231. 
Coccophagus lunulatus, fig. 8, p. 232. 
Copris gopheri, fig. 20, p. 310. 
Cremnops vulgaris, female, fig. 30, p. 371. 
Diaspis lanatus, figs. 12, 13, 14, 15, 16, 17, pp. 287, 
292, 293, 294. 
Erastria scitula, fig. 1. p. 6. 
Hadena fractilinea, fig. 5, p. 155. 
| Nomada, modification of hind leg of, fig. 25, d 
Hessian fly, map showing divergence of two an- 
nual broods of, fig. 3, p. 149; table showing an- 
nual cycle of, fig. 2, p. 147. 
Melipona, modifications of hind legs, fig. 24, B, 
p. 357; wax disk of, fig. 23, c, p. 356. 
| Melissodes, modification of hind leg of, fig. 25, 
b, p. 359. 
Modifications of hind legs of different bees, fig. 
24, p. 357; fig. 25, p. 359. 
p. 359. 
Nomia, modification of hind leg of, fig. 25, f, p. 
359. 
Onthophagus polyphemi, fig. 21, p. 311. 
Pear infested with San José scale, fig. 26, p. 366. 
Perdita, modification of hind leg of, fig. 25, ¢, p. 
359. 
Phylleeeus flaviventris, fig. 18, p. 296. 
Phylloxera, inundating vineyard to control, fig. 
22, p. 316. 
San José scale, adult female, fig 28, p. 368; 
adult male, fig. 29, p. 369; apple branch in- 
fested with, fig. 27, p. 367; pear infested with, 
fig. 26, p. 366. 
Signiphora occidentalis, fig. 10, p. 234. 
Wax disks of social bees, fig. 23, p. 356. 
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