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



Pathogenesis. — Two records of myiasis caused by this species have 

 been published, but one of these, relating to intestinal myiasis, is cer- 

 tainly incorrect, and the other, relating to auricular myiasis, is highly 

 questionable. So far as known, the larvae live in birds' nests. 



Figure 66. — Anthomyia procellaris, mature larva: A, lateral view; B, anterior 

 end, lateral view ; C, posterior view of last body segment, showing spiracles and 

 eight pairs of tubercles; D, a tubercle, enlarged. (After Keilin (67, p, 155).) 



The Genus PAREGLE Schnabl and Dziedzicki 



This genus contains several species of grayish or dull blackish Mus- 

 cidae, of medium size. The epistoma is very prominent, extending 

 somewhat beyond the vibrissa! angle and forming almost a right angle 

 with the main part of the clypeus ; the propleura are bare ; the scutellum 

 is provided with some soft erect hairs on its ventral surface ; the anal 

 vein reaches to the wing margin, at least as a fold ; the apical cell is 

 broadly open ; the lower calypters usually extend distinctly beyond the 

 upper ; the middle tibia bears a median anteroventral bristle. 



PAREGLE RADICUM (Linnaeus) 



Synonyms. — Anthomyia radicum (Linnaeus) ; Hylemyia radicum (Linnaeus). 

 There have been several little-used specific synonyms and other generic combi- 

 nations. 



Recognition Characters. — Adult : This is a grayish fly, usually with the an- 

 terior half of the frontalia of the female conspicuously orange. The acrosticals 

 are irregularly paired, with numerous accessory setulae between the rows ; the 

 lower calypters protrude distinctly beyond the margin of the upper ; the hind 

 tibia has three posterodorsal and live to eight anterodorsal bristles. The legs 

 are black. Length about 5 mm. 



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

 North Canada (Akpatok Island, Ungava Bay), New Brunswick, Quebec, Ontario, 

 Manitoba, Alberta, British Columbia, Maine, New Hampshire, Massachusetts, 

 Connecticut, New York, New Jersey, Pennsylvania, District of Columbia, Indiana, 



