LIST OF PLATES 



The House or Typhoid Fly, Musca domestica. Greatly enlarged. 



(Howard and Pierce, Photo by Dovener) Frontispiece 



PLATE ~ FAQE 



I. Screw Worms and Blow Flies. (Howard and Pierce, Photos by Dove- 

 ner) 133 



Fig. 1 . The blue bottle fly, Calliphora vomitoria. 

 " 2. The green bottle fly, Lucilia coesar. 

 " 3. The American screw worm, Chryscymya macellaria. 

 " 4. The black blow fly, Phormia regina. 



11. Eggs of the American Screw Worm, Chrysomya macellaria. On Meat. 



(BiSHOPp) 134 



III. Flies with Dangerous Habits. (Howard and Pierce, Photos by Dove- 



ner) 136 



Fig. 1. A flesh fly, Sarcophaga sarracenioB. 

 " 2. The non-biting stable fly, Muscina stabulans. 

 " 3. The lesser house fly, Fannia canicularis. 

 " 4. The brilliant green fly, Pseudopyrellia cornicina. 



IV. Screw Worm Injury to a Yearling Calf. (Bishopp) 150 



V. Manure Box with Flytrap Attached. (Bishopp) . . 155 



YI. Manure Spreader. (Bishopp) 157 



VII. Road Drag in Use Scraping Manure in a Cow Lot on a Tennessee Farm. 



(Bishopp) 159 



VIII. Undesirable Conditions Which Are Overcome by Use of the Maggot 

 Trap. A manure pile covering a large area and having little depth. Illus- 

 trating the conditions which favor the greatest loss of nitrogen, and at the 

 same time offer the best breeding ground for flies. (Hutchison) . . . 159 



IX. Carcass Partly Destroyed by Larv^ of the American Screw Worm 



Fly, Chrysomya macellaria. (Bishopp) 177 



X. Horse Bot Flies. (Dove) 183 



Fig. 1. Gastrophilus iritestinalis, the common bot. 

 " 2. Qastrophilus hcemorrhoidalis, the nose fly. 



XI. Phases of the Life Cycle or Bot Flies. (Bishopp) 184 



Fig. 1. Empty eggs of the cattle bot, Hypoderma lineata. 

 " 2. Eggs of the common horse bot, Qastrophilus intestinalis. 

 " 3. Full grown larva of Hypoderma lineata. 

 " 4. Empty puparium of Hypoderma lineata. 

 " 5. Empty puparium of Gastrophilus intestinalis. 



XII. Method op Attack by the Common Horse Bot, Gastrophilus intestinalis. 



(Bishopp) 185 



Fig. 1. Eggs on horse's legs. 

 " 2. Larvae attached to walls of stomach, showing lesions caused by 

 removed bots in center. 



XIII. Method op Attack by the Cattle Bot, or Heel Fly, Hypoderma 



lineata. (Bishopp) 186 



Fig. 1. Fly ovipositing on cow's leg. 

 " 2. Portion of cow's back showing larvae, empty holes, and pus exudate. 

 " 3. Heavily infested cow. 



XIV. Trench Prepared por Burning Carcass. (Bishopp) .■ 201 



XXV 



