130 



ENTOMOLOGY. 



front bristly; anterior border of the mouth with strong, usually 



numerous vibrissae. Tibiae with spurs. Bcatophaga stercorarw Linn. 



Family Anthomyidae. Thorax with a complete transverse suture. 



Fourth longitudinal vein straight or nearly so, hence the first pos- 



FIG. 152. Onion fly. o, larva, natural size; b, the same, enlarged. 



terior cell is fully open. Tegulae rather well developed. _ Phorbia 

 ceparum Meig. (Fig. 152). Homalomyi/t scalaris (Fabr., Fig. 153) is 

 the privy-fly; the maggots of this and //. cunicularis are sometimes 

 discharged from the human intestines and urethra. 

 Family Muscidae. Bristle of the antennae entirely plumose 



(Musca) or pectinated (Sto- 

 moxys). Body never slender; 

 thorax short; wings with the 

 first posterior cell only slightly 

 opened, or else closed at the 

 border of the wing; tegulre 

 large; legs stout. All the fore- 

 going families, with the three 

 following, are by many au- 

 thors placed in one great 

 family Muscidtv; but, to accord 

 with our present imperfect 

 knowledge, Loew and others 

 have provisionally divided 

 them into a great number of 

 small families. Musca domestica 

 Linn., the house-fly; Lutilia 

 macettaria Fabr. sometimes 

 lays its eggs in wounds in the 

 skin of man, producing hard 



FIG. 153. Homalomyia scalar is (?). a, 



larva, natural size; b, enlarged. After 



Curtis. 



red fluctuating tumors; its maggot is called the "screw-worm;" in 

 one case 300 of these maggots were found in or dropped from one 

 man's nose or nasal cavities, where it had destroyed the soft parts, 

 causing death. L. cmnr Linn., the blue-bottle fly; Callipliora ery- 

 throcephala Meig., the meat-fly; Stomoxys calciirans Linn, has a long, 

 slender, hard proboscis; it breeds in or about stables, and bites 

 horses and human beings. 



