11 



the sides at the bottom by No. 8 or No. 10 wire, which is used also around 

 the aperture for the door and around the door itself. The angles between 

 the first funnel and the walls of the antechamber are floored with netting 

 and the final chamber is floored with the same material. The accompany- 

 ing drawings will enable anybody hand}' with tools to construct one of 

 these traps in a few hours. These plans are for a trap 3 feet long, a foot 

 and a half wide, and a foot high. At ordinary retail prices the cost of 

 material will be about 70 cents. ^ Paper patterns for the two funnels 

 can be made by first drawing the concentric circles, as shown in Figs. 

 5 and 6, and then laying off the straight lines, beginning with the longest. 

 The wa\y outlines indicate that the pattern is to be cut half an inch 



Fig. 5. — Pattern for first funnel of a trap to be 36 by 18 by 12 inches. 

 (After Biological Survey.) 



outside of the straight lines to allow extra wire for fastening the cones to 

 the top and sides of the trap. Fig. 7 shows how all the parts of a trap 

 ha\dng the above dimensions may be cut from a piece of netting 4 feet 

 wide and 6 feet long. The full lines in this figure indicate where the 

 netting is to be cut and the broken lines where it is to be bent. The 

 numbers at the angles in Figs. 5, 6 and 7 correspond with those in Fig. 4, 

 which shows in outline the relation of the different parts as the}' appear 

 when assembled. A trap of the above dimensions is as small as can be 

 used satisfactoril}'. Where sparrows are very numerous a larger size is 

 recommended. Fig. 8 shows how a trap 4 feet long, 2 feet wide, and 

 15 inches high may be made from a piece of netting 4 by 10 feet. This 

 is a very good size for parks and large private grounds. 



* The cost of material is now (1919) much increased. 



