. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 112 CIVIC BIOLOGY family, the tachina flies, many of which look much like com- mon house flies, feed upon other insects and are among our most effective helpers hi holding certain msects in check. Tachina flies are being imported from Europe to destroy gypsy and brown-tailed moths. Syrphus flies are another large family which feed upon other insects. Tachina and syrphus flies are found about rank vegetation in which other insects abound. Of flies caught in and about houses the typh
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 112 CIVIC BIOLOGY family, the tachina flies, many of which look much like com- mon house flies, feed upon other insects and are among our most effective helpers hi holding certain msects in check. Tachina flies are being imported from Europe to destroy gypsy and brown-tailed moths. Syrphus flies are another large family which feed upon other insects. Tachina and syrphus flies are found about rank vegetation in which other insects abound. Of flies caught in and about houses the typhoid fly gener- ally numbers over 90 per cent. It is distinguished by the '' elbow'" on the fourth A^ein as it curves up to the third vehi near the tip of the wing (Fig. 55). The proboscis is an extensible trunk adapted for lapping up liquids, and cannot be used for either bitmg or piercing. The foot is provided with cla\As for climbing over rough surfaces, and also with two pads (pulvilli) covered \\'itli sticky, tubular hairs, which enable the fly to walk on ceilings and windowpanes. No more effective mechanisms. Fig. 55. Wings of (a) house fly, (6) stable fly, (c) little house fly, (d) horn fly Photograph l)y I. A. Field for collecting dust could be designed than a fly's feet and proboscis, a combination of six feather dusters and thirteen damp sponges. The constant " cleaning " movements of flies are clearly designed to rub off' and scatter the adhering germs everywhere they go. The '' little house fly " (^Fmtnia canicuJaris), smaller than the common fly, is often seen in swarms hovering under chandeliers. In breeding and feeding habits it resembles the house fly. Other flies found about houses are the followmg: Bluebottles, greenbottles, and flesh flies, or blowflies, which so frequently lay thek eggs on meat. These flies are scav- engers, but we can dispose of dead animals in nuich more. Please note that these images are extracted from scanned page ima
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