COCKROACHES 141 



only those that are bright and smooth inside. The 

 roaches after they have once entered the trap cannot 

 climb up the sides of such boxes and escape. 



Again, in Plate II is shown a somewhat more modern 

 idea of a roach trap. The holes in the side of the box are 

 fitted with cone-shaped tubes, the outer ends of which are 

 just flush with the outer surfaces of the sides of the box. 

 The roaches easily find their way into the box through 

 the cones in search of the food inside, but cannot find their 

 way out. 



Roaches, in general, are very fond of stale beer and 

 advantage is taken of this, especially in England, to trap 

 them by drowning them in this liquid. Any deep jar will 

 serve for the purpose. It is partially filled with the beer 

 and sticks are then inclined against the jar on the outside 

 and bent over until they project into the beer. The 

 roaches climb up the sticks and slip down into the liquid 

 in which they are drowned. 



A rather unique way of killing roaches is described by 

 Tepper of Australia. Plaster of Paris, one part, is mixed 

 with flour, three or four parts, in a saucer, and placed 

 where the roaches are abundant. Near by is placed a 

 flat dish containing water, with bridges arranged so that 

 the roaches can easily get to it. They eat of the flour and 

 plaster of Paris and then drink the water. As a result, 

 the plaster of Paris sets in the intestines and kills them. 

 At any rate, they disappear. 



Powders. — Buhach or pyrethrum is often used as a 

 powder against cockroaches and when it can be procured 

 in a fresh condition and is used persistently much good 

 can be accomplished. It seems to be more effective against 

 the three large species than against the croton-bug. 



