BAIT AND LIGHT TRAPS. 317 



accordiug to the height of the cottou, and is preferably set so low as 

 to strike the tops of the plants. By clamp-screws the pan-lamps are 

 attached to this bar. The runners are thought to do less injury than 

 wheels would to the crop, and are placed so far apart as to straddle 

 two rows or more. Different hinds of traps or torches, as inflammable 

 balls, may be us jd on the frame if desired. 



Bait Traps. — These traps appeal to the sense of smell as associated 

 with that of taste. 



The Heard Bait Trap. — This device was patented by Mr. J. M. Heard 

 in 18G0, and is illustrated in Plate LXl, Fig. 4, which gives a section 

 view. The circular pan, A, contains the bait, B, mixed with adhesive 

 substance to attract and drown the moths. A partial cover, «, with a 

 widely open center and forming a ledge, «, i^rojecting horizontally in- 

 wards from the upper edge of the pan a short space above the liquid 

 bait prevents the moths from getting at the bait without falling in, and 

 then helps to stop their escaping. The inverted cone, 0, and circular 

 umbrella or rim, D, are for the moths to strike upon and to deflect 

 or knock them down into the bait, which is made as follows: To a little 

 anise, fennel, or other essential oil, add a little alcohol, and afterwards 

 mix with this a gallon of molasses for each ounce of the oil used. A 

 fresh mixture of the bait should be introduced once a week. According 

 to the Agricultural Department Eeport on Cotton Insects, 1879, this 

 trap has been '^ quite extensively used" in the South. 



The Garrett Bait Trap.— Made by Mr. J. G. G. Garrett, of Port Gib- 

 son, Miss., is shown in plan section in Fig. 2, PI. LXI. Upon the stake, 

 s, is mounted a tray, /, containing the bait, x^ and bearing a horizontal, 

 inward-projecting edge, e, of sheet metal about three-fourths of an inch 

 wide, and situated a short distance above the bait, x^ to cause the moths 

 approaching the bait to fall in and then prevent their escape. In the 

 center is a support, ^, for a light and having also a horizontal ledge. 

 Mr. Garrett does not recommend the use of the light and has much bet- 

 ter success with bait alone, so the former may be omitted. Above the 

 whole is a roof, r, under the eaves of which, and at its ends, is space for 

 the moths to enter. This will help prevent their escape and protect the 

 bait from being afl'ected by rains. The bait consists of about equal 

 quantities of molasses and water, with a little vinegar or other attractive 

 substances. Occasionally the insects may be strained out from the bait, 

 which is then used again. Mr. Garrett's older lamp-trap, noticed below, 

 is now abandoned for this one which has some preference. 



Traps coMRiNiNa light and bait. — Traps may be made to combine 

 the best features of both the preceding kinds and the two different at- 

 tractives, bait and light, may be used simultaneously or in alternation. 

 Where the bait is used at night associated with a light, the former may 

 help some in drawing the insect to the latter, but when the light is 

 once closely approached its dazing effect on the insect probably produces 

 the entire effect which follows. The bait may be used independently in 

 the daytime and the light with it or independently at night. 



