XX ILLUSTRATIONS 



FIGURE PAGE 



280. The Yellow Dung-fly {Scatophaga stercorarid) , male. After Graham- 

 Smith 124 



281. The same, female. After Graham-Smith 124 



282. A Horse-fly or Gad-fly (//afwato/)ti/a z'///a/(2). From Austen 124 



283. A Bibionid Fly {Bibio albipcnnis). After Washburn 124 



284. The Cheese or Ham Skipper Fly {Piophila casei) ; the maggots or " skip- 

 pers" are frequently found in dried or smoked meat, cheese, etc.; 

 sometimes, taken into the stomach, they cause sickness. After 

 Graham-Smith 126 



285. The same, side view. After Washburn 126 



286. The Window Fly {ScenopinusfencstraUs) ; the very slender maggots feed 

 on the caterpillars of clothes moths and on flea maggots. After Graham- 

 Smith 126 



287. The Fruit Fly {Drosophila Jcneslranim); a small yellowish fly commonly 

 seen about fruit, Jam, etc., in which it breeds. After Graham-Smith. . . 126 



288. The Bee-fly {Eristalis tenax), which is often mistaken for the honey bee; 

 the rat-tailed maggots found in deca3dng substances in water or in wet 

 decaying flesh are the young of this fly. After Kellogg 126 



289. The Raven Fly (Mitsca corvina), male; a country relative of the house- 

 fly. After Graham-Smith 126 



290. The same, female. After Graham-Smith 126 



291. An African fly {Pycnosoma marginale) with the habits of the house-fly. 

 After Graham-Smith 126 



292. Another similar fly {Pycnosoma chloropyga) from southern and south- 

 eastern Africa. From Graham-Smith 126 



293. A related fly {Pycnosoma putoriiim). From Graham-Smith 126 



294. A curious little fly {Platypcza, sp.). After Washburn 126 



295. A Fungus Gnat {Sciara, sp,). After Washburn 126 



296. A small fly {Oscinis pallipcs) believed to be responsible for the spread 



of yaws in the West Indies. From Graham-Smith 126 



297. A strange little fly {Calohata univittata). After Washburn 126 



298. An Owl-midge or Moth-fly (P.?yc/jorfa, sp.). From Graham-Smith 126 



299. Our native Stalk-eyed Fly {Sphyracephala brcvicornis). After Willis- 

 ton 130 



300. A foreign Stalk-eyed Fly {Diopsis, sp.). After Williston 13° 



301. A Blepharocerid Fly {Bibiocephala elegantida). After Kellogg 13° 



302. A Phorid {Piiliciphora, sp.). After Williston 13° 



303. An Agromyzid {Ochthiphila polystigma). After Williston 130 



304. An Agromyzid {Phytofnyza, sp.). After Williston 13° 



305. An Agromyzid {Agro^nyza, sp.). After Williston 130 



306. An Agromyzid {Paramyia, sp.). After Williston 13° 



307. A Dixid Fly {Dixa, sp.). After Kellogg 130 



308. A Bolichopodid Fly {Psilopodinus si pko). After Lugger 13° 



309. A Pipunculid Fly {Pipiinciilus fusciis). After Lugger 13° 



310. A Dung Fly {Sepsis punclum). From Graham-Smith 13° 



311. A Bombyliid Fly {Exoprosopa, sp.). After Kellogg 13° 



312. A Spider-eating Fly {Opscbius ptcrodontinus). After Lugger 13° 



