Flytraps and Their Operation 



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The trap consists essentially of a screen cylinder ^vitli a frame 

 made of barrel hoops, in the bottom of which is inserted a screen 

 cone. The height of the cylinder is 24 inches, the diameter 18 inches, 

 and the cone is 22 inches hi<ih, and IS inches in diameter at the 

 base. Material necessary for this trap consists of four new or sec- 

 ondhand wooden barrel hoops, one barrel head, four laths, 10 feet 

 of strips 1 to IY2 inches wide by one-half inch thick (portions of 

 old boxes will suffice), 61 linear inches of 12 or 14 mesh galvanized 

 screening 24 inches wide for the sides of the trap and 41 inches of 

 screening 26 inches wide for the cone and door, an ounce of carpet 

 tacks, and two turn- 

 buttons, which may G 

 be made of wood. 

 The total cost of the 

 material for this trap, 

 if all is bought new 

 at retail prices is 

 about $1. In practi- 

 cally all cases, how- 

 ever, the barrel hoops, 

 barrel head, lath, and 

 strips can be obtained 

 without expense. 

 This would reduce 

 the cost to that of 

 the Avire and tacks, 

 which would be 80 

 cents. If a larger 

 number of traps are 

 constructed at one 

 time, the cost is con- 

 siderably reduced. 



One of these traps 

 is illustrated in Fig- 

 ures 1 and 2. In con- 

 structing the trap 

 two of the hoops are 

 bent in a circle (18 

 inches in diameter on 

 the inside), and nailed 

 together, the ends 

 being trimmed to 

 give a close fit. 

 These form the bottom of the frame (A), and the other two, 

 prepared in a similar way, the top (B). The top (C) of the 

 trap is made of an ordinary barrel head with the bevel edge sawed 

 oif sufficiently to cause the head to fit closely in the hoops and 

 allow secure nailing. A square, 10 inches on the side, is cut out of 

 the center of the top to form a door. The portions of the top (bar- 

 rel head) are held together by inch strips (D) placed around the 

 opening one-half inch from the edge to form a jamb for the door. 

 The door consists of a narrow frame (E) covered with screen (F) 

 well fitted to the trap and held in place (not hinged) by buttons {(?). 



Fig. 1. — Conical hoop flytrap, side view. A, hoops forming 

 frame at bottom. B, Hoops forming frame at top. 

 C, Top of trap made of barrel head. D, Strips around 

 door. E, Door frame. F, Screen on door. O, Buttons 

 holding door. H, Screen on outside of trap. /, Strips 

 on side of trap between hoops. J, Tips of these strips 

 projecting to form legs. K, Cone. Lj United edges of 

 screen forming cone. M, Aperture at apex of cone 



