. Guide leaflet. t certainwingless insects, and finally the mites and ticks. Two sorts of Diptera or two-winged insects are of interest in thepresent connection: (1) ordinary flies with three-jointed antenna;;and (2) mosquitoes, gnats, etc., which have eight or more freelymoving joints in each antenna. The Muscida and the Tabanida*(p. 13) are of the first sort. The Muscida, a group which includes our commonest disease-bearing insect, the filth fly, are characterized as follows: The squama* (see Fig. 1) of Diptera are scale-like structures placedback of the roots of the wings and above the knob
. Guide leaflet. t certainwingless insects, and finally the mites and ticks. Two sorts of Diptera or two-winged insects are of interest in thepresent connection: (1) ordinary flies with three-jointed antenna;;and (2) mosquitoes, gnats, etc., which have eight or more freelymoving joints in each antenna. The Muscida and the Tabanida*(p. 13) are of the first sort. The Muscida, a group which includes our commonest disease-bearing insect, the filth fly, are characterized as follows: The squama* (see Fig. 1) of Diptera are scale-like structures placedback of the roots of the wings and above the knobbed balancers;and the Muscida agree with the related Diptera in having thesesquama large. The auxiliary vein in the wing (see Fig. 1) is distinctin its whole course, and the first longitudinal vein is never veryshort. The thorax has a complete transverse suture. The eyes ofthe male are usually much nearer together than those of the female:sometimes, in fact, so close that they touch each other. WSECTS AND DISEASE. Fig. 1. THE FILTH FLY (Mnsca dotnestica) *• Auxiliary vein »• First longitudinal vein c. Fourth longitudinal vein d. Discal cell«•• Anal cell /• Antennae </• Transverse suture • Squama • Abdomen /• Tibia THE FILTH FLYMusca domestica More volumes have been written about this insect in the lasttwenty years than have been devoted to any other one insect (unlessit be the honey-bee) since man became civilized enough to writeabout insects at all. This fly is commonly called the house fly, but that name liasbeen justly criticized because it seems to imply a necessary domesticrelation. We do not believe that this insect should be a house fly inthe future; and Dr. L. O. Howard of Washington, in view of its re-lation to disease, has suggested that is should be called the TyphoidFly. This seems, on the other hand, to relate rather too closelya disease and an insect which are sometimes, but not universally,connected. Filth Fly is perhaps the best term and o
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