LIST OF PLATES 



PLATE FACING PAGE 



I. Fig. I. Side view of blow-fly (C erythrocephala) 



„ 2. Leg of flesh-fly {S. carnaria) 



„ 3. Part of wing of blow-fly {C. erytlirocephala) . 10 



II. Fig. I. House-fly, Miisca doiiiestica 



„ 2 & 3. Raven fly, Musca corvina 



„ 4. Larva of blow-fly, full grown .... 20 



III. Fig. I. Blow-fly or blue bottle, CaUiphora eiytJirocephala 



„ 2. „ ,, ,, Calliphofa vo7nito7-ia . 22 



IV. Fig. I. Green bottle, Liicilia ccesar 



„ 2. Cluster fly, PoUenia riidis 24 



V. Fig. I. Miisciiia stabiilans 



„ 2. Stable fly, or biting house-fly, Stonioxys calcitrans 



„ 3. Head of Stotiioxys calcitrans .... 28 



VI. Fig. I. Lesser house-fly, Fannia caniciilaris 



,, 2. Latrine fly, Fantiia scalaris 



„ 3. Flesh fly, Sarcop/iaga carnaria .... 32 



VII. Fig. I. Dung fly, Sepsis punctiim 



„ 2. Cheese-fly, Piophila casei 36 



VIII. Figs. I & 2. Yellow dung fly, Scatophaga stercoraria . 38 



IX. Fig. I. Fruit fly, Drosophila fenestrariiiii 



„ 2. Owl midge or moth fly, Psychoda sp. 



„ 3. Window fly, Scenopinus fenestralis ... 40 



X. Figs. I & 2. Eggs of house-fly in stable manure 



Fig. 3. Larva; of house-fly in stable manure . . 42 



XI. Fig. I. PupEe of house-fly in stable manure 



,, 2. Larvae and pupa; of house-fly in ash-pit refuse . 44 



XII. Longitudinal section of fly's proboscis .... 53 



XI II. Microscopic preparations showing the structure of the oral 



lobes of the proboscis ....... 54 



XIV. Photographs of marks left by the proboscides of flies after 



feeding .......... 64 



XV. Photographs of dissections of flies' crops before and after 



feeding .......... 70 



XVI. Photographs of flies before and after feeding ... 72 



