THE FLIES THAT CAUSE MYIASIS IN MAX 75 



Strickland and Roy (US) experimentally produced a fatal enteric 

 myiasis with this species in a puppy. It is conceivable that it may 

 occasionally be involved in human enteric myiasis. 



CHRYSOMYA MICROPOGON (Bigot) 



The Steel-bine Blowfly 



Recognition Character. — Adult: This is a broad, robust, steel-blue fly, with 

 narrow and not very conspicuous black cross bands at the incisures of the 

 abdominal segments. In the male the eyes are very closely approximated and 

 are not divided into an upper zone of larger and a lower zone of smaller facets ; 

 the parafrontals and parafacials are grayish yellow : the clypeus and cneens 

 are dark yellow. In the female the frontalia are reddish brown and a little 

 narrower at the ends than in the middle : the parafrontals and parafacials 

 are yellowish gray throughout but darker at the vertex. Length, about 12 mm. 

 Larva : The larva is smooth, robust, and cream-colored. The posterior spiracles 

 are separated by about half their greatest diameter; the peritreme is moderately 

 thick ; the slits are straight and very wide. 



Geographical Distribution. — Australian Region: Western Australia, Queens- 

 land, Canberra, New South Wales. 



Pathogenesis. — This species is a common sheep maggot in Aus- 

 tralia : its role is secondary in the southern part of its range, although 

 to the north it is said to become a primary invader. It has not yet 

 been recorded in human myiasis. 



The Genus PHORMIA Robineau-Desvoidy 



This genus, in the restricted sense, is characterized as follows: The 

 eyes are bare and narrowly separated or contiguous in the male: 

 the arista is plumose to the tip. The mesonotum is convex ; the meso- 

 thoracic spiracles are elongated, with bright orange hair: the lower 

 squama is bare: the hind coxae lack posterior cilia. There are four 

 to five postsutural dorsocentrals. The wings are hyaline. t 



PHORMIA REGINA (Meigen) 



The Black Blowfly 



Recognition Characters.— Adult : This is a medium-sized fly. usually 7-9 

 mm. in length but sometimes larger or smaller : the body is blackish green or 

 olivaceous green, the head chiefly black. The orange hair of the mesothoracic 

 spiracle is conspicuous. Larva: The third-stage larva is creamy translucent 

 white, becoming yellow with maturity. The peritreme of the posterior spiracle 

 is moderately broad; the two spiracles are separated from each other by a 

 distance about two-thirds the diameter of a spiracle. 



Geographical Distribution. — Throughout the cooler parts of the Holarctic 

 Region ; more abundant in the spring and fall. Nearctic Region : Alaska. North- 

 west Territory, Quebec. Alberta, British Columbia. Maine. New Hampshire, 

 Massachusetts, Rhode Island. Connecticut. New York. New Jersey. Pennsylvania, 

 Maryland, District of Columbia. Virginia. West Virginia, North Carolina, Georgia, 

 Alabama. Mississippi. Ohio, Indiana. Illinois. Wisconsin, Iowa. Missouri. North 

 Dakota. South Dakota, Nebraska. Kansas, Arkansas. Louisiana. Texas. Montana, 

 Idaho. W T yoming, Colorado, Utah. Nevada. New Mexico. Arizona. Washington. 

 Oregon, California. Neotropical Region : Mexico. Palaearctic Region : Ireland. 

 England, France. Netherlands. Italy. Corsica. Germany, Czechoslovakia, Austria. 

 Yugoslavia. Bulgaria, Greece, European Russia, southwest Mongolia. Australian 

 Region : Hawaiian Islands. 



Biology and Pathogenesis. — The e<rgs are deposited in aggluti- 

 nated masses of varying numbers. The larvae are normally sapro- 

 phagous and breed in large numbers in carcasses of animals. Develop- 



