130 ENTOMOLOGICAL NEWS. [April, '06 



aleyrodids occurrring in Connecticut. In greenhouses and 

 dwellings it lives through the winter on various kinds of 

 plants. Remedial measures are absolutely necessary to save 

 the infested plants, and of these fumigation with hydrocyanic 

 acid gas is perhaps the most successful. House plants can be 

 dipped into a soap and water mixture (i Ib. to 8 gals.) with 

 good results. 



Larvae and pupae are oval, light green or yellow in color, 

 and abound on the under sides of the leaves. Pupa about 

 .70 x .50 mm., with submarginal row of wax rods. Six pairs 

 of long curved wax rods are borne on the dorsum, which is 

 somewhat convex. 



Body of adult is yellow, wings white and immaculate. 



A. vaporariorum has been collected and observed upon over 

 sixty different food plants in Connecticut, but it is especially 

 abundant on tomato, melon, cucumber, tobacco, Ageratum, 

 Lantana, Fuchsia and heliotrope. 



Formaldehyde as an Insecticide. 

 BY M. V. SLINGERLAND. 



Cornell University recentlj^ purchased quite a large quantity 

 of "Solidified Formaldehyde," subject to a written contract 

 that " this material is guaranteed to kill bedbugs, moths and 

 roaches, used with 4 ounces to 1,000 cubic feet and exposure 

 to fumes of gas 8 hours, closed room." This was a good op- 

 portunity to test the insecticidal value of formaldehyde, and I 

 made the following experiment : 



Five live bedbugs were placed (one in each) in small paste- 

 board pill boxes, which were covered with one thickness of a 

 muslin with meshes about one millimeter square. Ten live 

 cockroaches were placed in each of three glass, pint, fruit- 

 jars, covered with one thickness of a thin muslin with meshes 

 nearly one-half millimeter square. These insects were placed 

 in different parts of a room, some on the floor, others near the 

 ceiling, and some about midway of the room, on top of some 

 furniture. The room contained 1,760 cubic feet, but was 



