92 MISC. PUBLICATION 631, U. S. DEPT. OF AGRICULTURE 



prothoracic spiracle are orange ; the abdomen is violet-blue in ground color. 

 Length 8-10 mm. 



Gpx>graphical Dtsteibution. — Ethiopian Region : Eritrea, Kenya, Tanganyika, 

 South-West Africa, South Africa (Natal, Transvaal, Cape of Good Hope), Saint 

 Paul Island. 



Pathogenesis. — A case of auricular myiasis has been reported from 

 South Africa, and larvae have been recovered from the stool of a 

 native child, also in South Africa. 



CALLIPHORA VOMITORIA (Linnaeus) 



Recognition Characters. — Adult : This species is similar in appearance to 

 C. vicina, from which it may be distinguished by the characters given in the key. 

 The bucca is black, about half the eye height in the male and two-thirds the eye 

 height in the female, and is clothed with reddish-orange hairs ; there are three 

 postintra-alar bristles. Length 10-14 mm. Larva : The posterior spiracle is 

 similar to that of G. vicina, but the inner margin of the peritreme between the slits 

 is not scalloped. 



Geographical Distribution. — Nearctic Region : Greenland, Alaska, Labrador, 

 Quebec, Ontario, Alberta, British Columbia, Maine, New Hampshire', Vermont, 

 Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Maryland, 

 North Carolina, Indiana, Minnesota, Wisconsin, Kansas, Texas, Idaho, Colorado, 

 Utah, New Mexico, Washington, Oregon, California. Neotropical Region : Mexico 

 (highland), Bermuda (?). Palaearctic Region: Ireland, Scotland, England, 

 Portugal, Spain, France, Netherlands, Italy, Corsica. Sicily, Norway, Sweden, 

 Lapland (Swedish), Denmark, Germany, Poland, Czechoslovakia, Austria, Hun- 

 gary, Rumania, Bulgaria, European Russia, Azores, Canary Islands, Madeira, 

 Morocco, Libia, China, Japan. Oriental Region: India (northern part), Philip- 

 pine Islands. Ethiopian Region : Cape of Good Hope, St. Paul, and Amsterdam 

 Islands. Australian Region : Hawaiian Islands. In addition, it has been re- 

 corded from various tropical regions and New Zealand, but these records are most 

 probably erroneous. 



Biology and Pathogenesis. — The life history and habits of this fly 

 are probably similar to those of 0. vicina. It is primarily a carrion 

 feeder ; however, it may be attracted to ill-smelling sores or lesions, or to 

 diseased body openings, in which case the larvae may penetrate deeply 

 into the surrounding tissue. Cases of gastrointestinal myiasis have 

 been reported. 



The Family GASTEROPHILIDAE 



This family has been treated by many authors as part of the 

 Oestridae or Larvaevoridae (Tachinidae) , on the one hand, and of the 

 Muscidae or Anthomyiidae, on the other. The present treatment con- 

 forms with that of Comstock, Curran, Townsend, and other authors 

 who consider the genus Gasterophilm, in the broader sense, either alone 

 or together with some genera not of medical importance to man, as 

 having family rank. For the purposes of this work, therefore, the 

 family characters may be considered the same as those of the genus 

 G aster ophilus. 



The Genus GASTEROPHILUS Leach 



The name of the genus is sometimes incorrectly spelled Gastrophilus, 

 as emended by Schiner (/31, p. 390). Townsend, in his Manual, di- 

 vides it into four genera — G aster ophilus (in the strict sense), Pro- 

 gastr ophilus, Haemorrhoestrus, and Rhino gastr ophilus. 



In these flies the head is short and deep, clothed with conspicuous 

 pile but with the bristles strongly reduced or absent. The antennae 



