This volume includes: introduction; chapters on morphological terms for adults and larva; keys to family for adults and larvae; keys to genera for all non-Schizophoran flies, e.g. "Nematocera", "Orthorrhapha," and Empidoidea.

An easier search to find family info on the PDF, courtesy of V. Belov:

To jump to family chapters in the PDF files, enter the following
numbers into the pdf viewer page # box (volume indicated before the
page #)
Acartophthalmidae 2:195 • Acroceridae 1:585 • Agromyzidae
2:205 • Anisopodidae 1:315 • Anthomyiidae 2:435 •
Anthomyzidae 2:223 • Apioceridae 1:551 • Asilidae 1:559
• Asteiidae 2:235 • Athericidae 1:489 • Aulacigastridae
2:227 • Axymyiidae 1:219 • Bibionidae 1:227 •
Blephariceridae 1:201 • Bombyliidae 1:599 • Braulidae 2:249
• Calliphoridae 2:469 • Camillidae 2:359 • Canacidae
2:415 • Carnidae 2:245 • Cecidomyiidae 1:267 •
Ceratopogonidae 1:403 • Chamaemyiidae 2:301 • Chaoboridae
1:345 • Chironomidae 1:433 • Chloropidae 2:385 •
Chryomyidae 2:321 • Clusiidae 2:189 • Coelopidae 2:255
• Conopidae 2:85 • Cryptochetidae 2:405 • Culicidae
1:351 • Curtonotidae 2:343 • Cypselosomatidae 2:93 •
Deuterophlebiidae 1:209 • Diastatidae 2:355 • Diopsidae
2:121 • Dixidae 1:339 • Dolichopodidae 1:635 •
Drosophilidae 2:347 • Dryomyzidae 2:259 • Empididae 1:617
• Ephydridae 2:363 • Heleomyzidae 2:309 •
Hilarimorphidae 1:613 • Hippoboscidae 2:607 • Lauxaniidae
2:287 • Lonchaeidae 2:127 • Lonchopteridae 2:11 •
Micropezidae 2:97 • Milichiidae 2:239 • Muscidae 2:451
• Mycetophilidae 1:233 • Mydidae 1:543 • Nemestrinidae
1:595 • Neriidae 2:105 • Nycteribiidae 2:619 •
Nymphomyiidae 1:213 • Odiniidae 2:199 • Oestridae 2:483
• Opomyzidae 2:217 • Otitidae 2:135 • Pachyneuridae
1:223 • Pallopteridae 2:175 • Pelecorhynchidae 1:469 •
Periscelididae 2:231 • Phoridae 2:25 • Piophilidae 2:181
• Pipunculidae 2:81 • Platypezidae 2:17 •
Platystomatidae 2:145 • Psilidae 2:117 • Psychodidae 1:303
• Ptychopteridae 1:335 • Pyrgotidae 2:149 • Rhagionidae
1:493 • Rhinophoridae 2:523 • Rhinotoridae 2:325 •
Richardiidae 2:169 • Ropalomeridae 2:277 • Sarcophagidae
2:495 • Scathophagidae 2:421 • Scatopsidae 1:323 •
Scenopinidae 1:535 • Sciaridae 1:257 • Sciomyzidae 2:263
• Sepsidae 2:281 • Simuliidae 1:365 • Sphaeroceridae
2:329 • Stratiomyidae 1:507 • Streblidae 2:629 •
Strongylophthalmyiidae 2:113 • Synneuridae 1:331 • Syrphidae
2:49 • Tabanidae 1:473 • Tachinidae 2:529 • Tanyderidae
1:159 • Tanypezidae 2:109 • Tephritidae 2:153 •
Tethinidae 2:409 • Thaumaleidae 1:361 • Therevidae 1:523
• Tipulidae 1:163 • Trichoceridae 1:311 •
Trixoscelididae 2:317 • Vermileonidae 1:539 • Xylomyidae
1:503 • Xylophagidae 1:499 • Corrections/addenda 2:639,
3:197 • Index 3:199

To use the index provided in the book:
Page per Index (P)    Calculate PDF page:
1 through 674 . . . . . . Vol. 1; P + 10
675 through 1332 . . . Vol. 2; P – 664
1333 and up . . . . . . . Vol. 3; P – 1321

Example: The Index indicates that the name Zavrelia is
mentioned on p. 443. To jump to that page, open the first pdf file of
the set and enter 453 into the pdf viewer page number box.