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



The flies may be attracted by odorous discharges, especially those of 

 an albuminous nature. 



Different species of Fannia may be associated with each other or 

 with Musca domestica in individual cases. Fannia canicularis has also 

 been known to be present, along with other muscoids, in wound myiasis 

 in monkeys. 



Literature. — For the identification of the Palaearctic species, the 

 keys of Seguy {133, pp. 259-268) for France, and of Karl (63) for 

 Germany, will be useful. Malloch (86) has given keys for the deter- 

 mination of the Nearctic species. Important works on the biology, 

 immature stages, and role in myiasis are Hewitt (58, p. 171), Mazza 

 and coworkers (87), Lampa (79), and Mumford (91). 



KEY TO SPECIES 



ADULTS 



1. Males : Eyes separated by no more than the width of the third antennal 



segment, often contiguons 2 



Females: Eyes separated by several times the width of the third an- 

 tennal segment 5 



2. Middle coxa on the anterior surface with one or more stout thorns which 



are directed downward and angularly bent at the apex (fig. 69) ; 

 abdomen black in ground color 3 



Figure 69. — Fannia scalaris, middle leg, exclusive of tarsus, of male. 



Middle coxa without thorns as above-described, merely with bristles of 

 the usual form and strength 4 



Middle tibia strongly expanded into a deformed tubercle ventrally beyond 

 the middle (fig. 69) ; grayish species; usually 2 bent thorns on the 

 middle coxa scalaris (Fabricius); male 



Middle tibia moderately thickened beyond the middle, but not tubercu- 

 late or deformed ; blackish species ; usually 1 bent thorn on the middle 

 coxa manicata (Meigen), male 



Hind tibia with several rather closely placed long hairlike bristles on the 

 middle of the anteroventral, posteroventral, and anterior surfaces; 

 abdomen black in ground color incisurata (Zetterstedt), male 



Hind tibia with 1 to 4 short bristles on the anteroventral surface, the 

 other ventral surfaces bare; second and third abdominal tergites largely 

 pellucid yellow canicularis (Linnaeus), male 



Mesonotum with 3 brownish vittae, the middle one at least distinct; 

 abdomen usually more or less extensively yellow at the base. 



canicularis (Linnaeus), female 



Mesonotum sometimes with paired, but not with a median, vitta; ab- 

 domen wholly black in ground color 6 



