22 NEW YORK STATE MUSEUM 



The large blue bottle fly, Cynomyia cadaverina Desv., 

 an associate of Phormia, is a frequenter of pantries and cellars and 

 oviposits on food products of animal origin, such as smoked, un- 

 cured and cooked meat. The preoviposition period is 7 to 20 days, 

 the egg stage lasts from I to 2 days, the larval development occu- 

 pies 3 to 5 days, puparia being formed 5 to 39 days after the larvae 

 hatch, and the pupal stage lasting 6 to 58 days. Thus the life cycle 

 may vary from 13 to 99 days. 51 



The blow fly, Calliphora erythrocephala Meign., 

 has a preoviposition period of 12 to 17 days, and an egg stage of 24 

 hours. The larvae migrate from the food 3 to 4 days after hatching, 

 and the pupal stage lasts from 7 to 9 days, the life cycle being com- 

 pleted in 15 to 20 days. 52 



The " screw worm " fly, Chrysomyia macellaria 

 Fabr., winters as a larva, the flies appearing shortly after warm 

 weather begins. The preoviposition period lasts from 3 to 18 days, 

 and eight consecutive ovipositions by one fly have been observed, 

 the period between each ranging from I to 7 days. From 40 to 248 

 eggs may be deposited in one batch, and a female may lay 1228. 

 The eggs hatch within a few hours, pupation occurs within 6 to 20 

 days, and the pupal period ranges from 3 to 27 days. This species 

 breeds in animals which have recently died. 53 



This fly has caused numerous losses among cattle and other 

 domestic animals owing to its habit of .depositing eggs in recent 

 flesh wounds or sores. The maggots aggravate the injury, and 

 unless quickly discovered may produce serious results. The fly 

 also attacks man, depositing eggs in the nostrils or mouth while the 

 victim is asleep. Such attacks are usually limited to sufferers from 

 catarrh. The maggots work rapidly and unless speedily discovered 

 and destroyed, the tissues of the nose, mouth and soft palate may be 

 honeycombed and the victim lose his life. 



The green bottle fly, Lucilia caesar Linn., winters as a 

 larva or pupa, the flies appearing on the first warm days. The 

 preoviposition period lasts from 6 to 20 days, the eggs hatch in less 

 than 24 hours, the larvae migrating 2 to 5 days later. The pupae 

 are formed 3 to 12 days after hatching, and the pupal period ranges 

 from 5 to 1 6 days. The total developmental period is from n to 

 24 days. 54 



51 Bishopp. Jour. Econ. Ent, 8:327. 1915. 



52 Bishopp. Jour. Econ. Ent., 8:327. 1915. 



53 Bishopp. Jour. Econ. Ent., 8:325. 1915. 

 * 4 Bishopp. Jour. Econ. Ent, 8:326. 1915. 



