A List of the Illustrations. 



Fig. Page 



1 — Cayor fly, larva 21 



2 — Melophagus Ovinus, Adult 26 



3 — Melophagus Ovinus, Pupa 26 



4 — Gastrophilus Equi, Larva 27 



5 — Oestrus Ovis, Larva 28 



6 — Hypoderma Lineata, Larva 30 



7 — Hematopinus Suis 37 



8 — Trichodectes Scalaris 39 



9 — Trichodectes Scalaris, Ovum 40 



10 — Menopon Biseriatum 41 



11— Goniodes Stylifer 43 



12 — Goniodes Stylifer, Ovum 43 



13 — Lipeurus Infuscatus 43 



14 — Goniocotes Hologaster 45 



15 — Lipeurus Baculus 45 



16 — Sarcoptes Mutans Variety Gallinae 45 



17 — Scaley Legs, Photograph reduced one-half 55 



18 — Psoroptes Communis, Variety Ovis, Male 57 



19 — Psoroptes Communis, Variety Bovis, Females 58 



20 — Psoroptes Communis, Variety Ovis, Head 59 



21 — Psoroptes Communis, Variety Bovis, Head 59 



22 — Demodex Folliculorum, Variety Canis, Stages of 



Development 66 



23 — Demodex Folliculorum, Variety Canis, Adult Males 66 



24 — Red Mpnge, Photograph of two pups 68 



25 — Argas Miniatus, Larvae 69 



26 — Ornithodoros Megnini, Larva 70 



27 — Margarapus Annulatus, Larva 70 



28 — Dermacentor Electus, Larva 70 



29 — Amblvomma Americanum, Larva 76 



30 — Spiroptera Scutata 90 



31 — Spiroptera Megastoma 91 



32 — Spiroptera Microstoma 91 



33— Filaria Papillosa 95 



34 — Ascaris Megalocephala 98 



vii 



