Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ed beak; *, the lancets, much enlarged ; Jj^™ niOUth One serieS is fur-c and d illustrate the feeler and foot. • t 1 • 1 1 • •^ nished with lancets similar tothose in the bugs, but more numerous, representing differentmouth structures, and not always carried into the head itselfThe sucking structure is also quite different, and never forms arigid, jointed beak. Mosquitoes and horse-flies are examples ofthis kind ; but gradually the lancets disappear, and in most of theflies o
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . ed beak; *, the lancets, much enlarged ; Jj^™ niOUth One serieS is fur-c and d illustrate the feeler and foot. • t 1 • 1 1 • •^ nished with lancets similar tothose in the bugs, but more numerous, representing differentmouth structures, and not always carried into the head itselfThe sucking structure is also quite different, and never forms arigid, jointed beak. Mosquitoes and horse-flies are examples ofthis kind ; but gradually the lancets disappear, and in most of theflies only the sucking lip, often greatly and interestingly developed,remains. The common house-flies and blow-flies are types of thismodified form, and are capable of taking liquid food only, thoughoften seen attacking solids. If the mouth of a fly be examinedunder the microscope, there will be seen at the tip of the lip aseries of deep grooves, stiffened with chitinous loops, and armedwith sharp projecting edges. When the fly wishes to feed on asolid, it scrapes the surface by means of these rasp-like projec-. STRUCTURE AND CLASSIFICATION. 19 Fig. 6.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
