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



in midsummer can be completed in a month or less. A number of cases 

 of intestinal and vesicular myiasis are on record, and the species has 



been recorded in aural myiasis. 



Literature. — An account of the immature 



stages, biology, and pathogenesis is given 



by Hewitt (5S, p. 16S) . 



FANNIA MANICATA (Meigen) 



Synonym. — Homalomyia manicata (Meigen). 



Recognition Characters. — Adult : This is a 

 blackish species with wholly black legs ; the tho- 

 rax lacks pale pollen ; the abdomen, especially in 

 the male, has more or less grayish pollen, with a 

 distinct median stripe of black; the general ap- 

 pearance is that of a species darker than the pre- 

 ceding one. Length about 5-7 mm. Larva : The 

 larva is similar to that of F. scalaris, but the lat- 

 eral processes are smaller and the dorsal processes 

 are reduced to small buttons which are scarcely 

 or not at all visible. 



Geographical Distribution. — Nearctic Region : 

 Alaska, Quebec, Ontario, Alberta, New Hampshire, 

 New York, New Jersey, Maryland, Ohio, Kansas, 

 Arizona, Washington, Oregon. Palaearctic Re- 

 gion : Scotland, England, France, Netherlands, 

 Corsica, Sweden, Finland, Lapland (Swedish), 

 Germany, Austria, European Russia, Egypt, 

 Kamchatka. 



Life History and Pathogenesis. — This 

 species has been recorded from nests of 

 Hymenoptera, decomposing fungi, and 

 other decaying plant and animal material. 

 Lampa (79) describes a case of intestinal 

 parasitism due to this species in associa- 

 tion with two others, and gives an account 

 of its biology and immature stages. 



Figure 70. — Fannia sca- 

 laris, mature larva. 

 (After Hewitt (58, p. 

 165).) 



FANNIA INCISURATA (Zetterstedt) 



Synonym. — Homalomyia inrtsurata (Zetterstedt). 



Recognition Characters. — Adult : This is a blackish species, with brownish 

 to blackish legs ; the parafacials and parafrontals are lightly dusted with grayish 

 pollen ; the thorax has two brownish longitudinal vittae ; the abdomen is gray 

 pollinose, with a black median vitta. Length 6-7.5 mm. Larva : The larva is 

 similar to that of Fannia scalaris, but the body is larger, more depressed, and 

 paler, often of a vitelline yellow ; the lateral body processes are longer, their 

 fringes almost filling the intervals between them ; and the dorsal processes are 

 reduced to chitinons buttons and are scarcely visible. 



Geographical Distribution. — Nearctic Region : Jan Mayen, Quebec, Mani- 

 toba, Alberta, British Columbia, Maine, New Hampshire, Massachusetts, Con- 

 necticut, New York, New Jersey, District of Columbia, Virginia, Minnesota, Idaho. 

 Neotropical Region : Mexico, Argentina. Palaearctic Region : Iceland, Scot- 

 land, England, Spain, France, Netherlands, Italy, Corsica, Malta, Sweden, Fin- 

 land, Germany, Austria, European Russia, Canary Islands, Madeira, Tangier, 

 Libia, China, Japan. 



Life History and Pathogenesis. — The life history is similar to that 

 of F. scalaris. The larvae, with their more strongly developed flota- 

 tion apparatus, are better adapted to life in a semiliquid medium. 

 Lesne found this by far the most abundant species breeding in cess- 



