786 REPORT OF NEW JERSEY STATE MUSEUM. 



HELICOBiA Coq. 



H. helicis Town. Chester IX, 3, New Brunswick VI, 4 (Coll); Avalon 

 VII, 22. 



Family MUSCID.E. 



This family contains the common house-fly, the stable fly, the horn-fly, 

 the blow-fly and similar well-known insects. All of these have the an- 

 tennal bristle hairy or plumose to the tip, but have no spines on the 

 abdomen except at the end, about the anal segments. 



The larvae of these flies are true maggots, and with few exceptions they 

 live in decaying material of all kinds, excrement, putrid meat, garbage, 

 etc. Eggs are laid in masses and hatch in a few hours, the larval life 

 being often scarcely a week. 



As scavengers these insects are useful, but they become a nuisance in 

 the house and in the stable. While the majority of the flies gain their 

 living by scraping and lapping liquid or pasty foods, a few of them are 

 blood-suckers, the mouth being developed for piercing and sucking. 



POLLENIA Desv. 



P. rudis Fab. Common throughout the State V-VIII; this is a larger fl.y 

 than the common house-fly, but is also found on windows, especially 

 in late summer. 



CHRYSOMYIA Desv. 



C. macellaria Fab. Common throughout the State VI-VIII; the larva of 

 this fly, known as the screw-worm, has done great harm in the south- 

 west, but is not injurious in New Jersey. 



CYNOMYIA Desv. 



C. cadaverina Desv. Boonton X, 9 (GG) ; Westville IX, 9, Clementon V. 

 9 (Jn); Lakehurst IX, 26 (Coll). 



CALLIPHORA Desv. 



C. erythrocephala Meig. Common throughout the State IV-X. 

 C. vomitoria Linn. This is the common "blow^-fly" which occurs every- 

 where in the State, all season. 

 C. viridescens Desv. Westville IV, 9. 



LUCILIA Desv. 



L. caesar Linn. Common throughout the State IV to XI. 

 L. sylvarum Meig. Jamesburg, Westville V, 19, Atlantic City. Anglesea 

 VII, 10. 



