CALLIPHOKIF.E. 21 



plates are about once and a fourth their diameter apart, each with 

 three simple, straight slits, directed slightly downward, but mostly 

 toward those of the opposite plate; the button is distinct. 



The blow-fly deposits eggs on dead animals, and also on fresh and 

 cooked meat. As such meats are often accessible to them in pantries, 

 it is readily seen that many larvae are swallowed by people each year; 

 we have, however, comparatively few records, probably because the 

 food causes no trouble. 



Protocallvphora cJirysorrhoea ^feig. 

 (Plate III, figs. 56-58.) 



Body rather short, thicker than usual behind. Head plainly 

 bilobed from above, each lobe bearing a distinct papilla, two separate 

 bifid mandibles; posterior margin of first segment with a broad 

 reflexed margin, bearing a fringe of black hair. ^Surface of body 

 closely, minutely scabrous; beginning with the third segment there is 

 below a median, transverse, apical, elevated, smooth lobe; on seg- 

 ments 4 and 5 there is a lateral lobe at each side; each segment from 

 below also shows a transverse, median furrow, and above most of the 

 segments show a broad, transverse depression. The anal area is 

 smooth, and shows an oblique lobe at each side; a median depression, 

 partly covered by a median lobe from above. Stigmal plates small, 

 about two to three diameters apart; each with three straight slits 

 directed obliquely downward and slightly toward those of the other 

 ])late. 



Pawnee on Delaware, Pa., attached to young bluebirds in nest, 

 Jul}^; Wellesley Hills, Mass., on nestling bluebirds, June. It also 

 occurs in Europe, and is_there known to feed on young birds. 



Lucilia sericata Meig. 

 (Plate III, figs. 54, 55, 60, 61.) 



Body rather stout, not slender in front. Head very distinctly 

 bilobed, with distinct antennae; mandibles two, well-separated. 

 Anterior spiracle with about eight lobes. Surface of body mostly 

 smooth; pleura of segments 3, 4, and 5 bilobed; beginning with seg- 

 ment 6 there is a basal ring or girdle, roughened; these girdles on 

 segments 6 to 9 are widened on middle of venter; these pleura are 

 also swollen, but not plainl}' bilobed, except those near tij). The 

 ventral segments are transversely divided by a line or furrow in the 

 middle. Last segments short, stigmal field occupying most of tJie 

 tip, slightly depressed, upper lip with three sharp tubercles each side, 

 the intermediate one hardly smaller than the others; lower lip with 

 two large, sharp tubercles each side, and a median pair more remote 

 from the marsin. Anal area rather sunken, witli a small rounded 



