367 _Sarcoptes scabiei._ (After Fürstenberg) 518 368 _Sarcoptes scabiei_: male, ventral aspect. (After Fürstenberg) 519 369 _Sarcoptes minor_ var. _cati_. (After Railliet) 521 370 _Demodex folliculorum_ of the dog. (After Mégnin) 522 371 _Linguatula rhinaria_: female 524 372 Larva of _Linguatula rhinaria_ (_Pentastoma denticulatum_). (After Leuckart) 524 373 _Linguatula rhinaria._ (After M. Koch) 525 374 Mouth-parts of _Pediculus vestimenti_. (After Denny) 533 375 Ovum of the head louse 533 376 Head louse, male 533 377 _Pediculus vestimenti_, Burm.: adult female 533 378 _Phthirius inguinalis_, Leach 534 379 Head of the bed bug from the ventral surface 535 380 _Dermatophilus penetrans_: young female. (After Moniez) 544 381 _Dermatophilus penetrans_: older female. (After Moniez) 544 382 _Pulex irritans_ 546 383 Larva of flea. (After Railliet) 546 384 _Pulex serraticeps_ 546 385 Head of a male and of a female Anopheles. (After Giles) 549 386 Head of a male and of a female Culex. (After Giles) 549 387 Mouth-parts of _Anopheles claviger_. (After Grassi) 550 388 _Anopheles maculipennis._ (After Nuttall and Shipley) 550 389 Longitudinal section of an Anopheles, showing alimentary canal. (After Grassi) 551 390 _Anopheles maculipennis_, Meigen. (After Grassi) 552 391 Larva of _Anopheles maculipennis_, Fabr. (After Grassi) 553 392 Larva of Culex. (After Grassi) 553 393 Pupa of _Anopheles maculipennis_, Meig. (After Grassi) 554 394 Heads of Culex and Anopheles. (After Daniels) 556 395 Eggs of Culex, of Anopheles, of Stegomyia, of Tæniorhynchus, and of Psorophora 557 396 Diagram showing the structure of a typical mosquito. (Theobald) 558 397 Types of scales, head and scutellar ornamentation, forms of clypeus. (Theobald, etc., etc.) 559 398 Neuration of wing. Explanation of wing veins and cells. (Theobald) 560 399 Wing of _Anopheles maculipennis_, Meigen 566 400 Wing of a Culex 575