yO SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



(91) Van Zwaluwenburg, R. H. 



1918. Report of the entomologist. Rept. Porto Rico Agr. Expt. Sta. 



for 1916, pp. 25-28. 



(92) ViCKERY, R. A., AND WiLSON, T. S. 



1919. Observations on wingless May beetles. Journ. Econ. Ent. 12: 



238-247, 2 pis. 



(93) Wakeland, C. 



1923. Practical control of Elcodcs hispUabrls over an extensive area. 



Journ. Econ. Ent. 16:96. 



(94) Weiss, H. B. 



1913. Notes on the negative geotropism of Corythuca ciliata Say, Adalia 

 bipunctata Linn., CoccincUa g-notata Hbst. and Megilla fus- 

 cilabris Mills. Journ. Econ. Ent. 6:407-409. 



(95) Weldon, G. p. 



1915. Potatoes as a trap-crop for wireworms. Monthly Bull. State 

 Commis. Hortic, Calif. 4:374. 



(96) Williams, C. B. 



1924. An improved light trap for insects. Bull. Ent. Research 15: 



pt. I, 57-60, 2 figs. 



(97) WODSEDALEK, J. E. 



1913. The reactions of certain Dermcstidae to light in different periods 

 of their life history. Journ. Animal Behav. 3:61-64, i fig. 



EXPLANATION OF PLATES 

 Plate i 



Photographs taken at the Japanese Beetle Laboratory in New Jersey, show- 

 ing hundreds of Japanese beetles attracted by geraniol ; i, loaned by the Japanese 

 Beetle Laboratory, and 2, by Van Leeuwen ct a!. 



1. When cloths (i foot square) were dipped in a 10 per cent emulsion of 



geraniol and suspended in orchards, beetles were drawn as if by a magnet. 

 Some of the attracted beetles, shown in the photograph, are on the cloth, 

 but most of them lie on the peach tree. 



2. It was discovered that the beetles would gorge themselves upon foliage, 



sprayed with a mixture of lead arsenate and sugar, on trees to which they 

 had been attracted by geraniol. 



Plate 2 



Photographs taken at the Japanese Beetle Laboratory, showing an electric 

 trap which attracts and kills Japanese beetles. (After Mehrhof and Van 

 Leeuwen. ) 



1. The trap rests on supports 4-1/2 feet high. A 250- Watt step up transformer, 



a resistance coil, and a condenser lie in the box under the trap. Several 

 dead beetles may be seen below the trap. The danger sign was placed 

 on the trap to prevent outsiders from molesting it. 



2. Near view of the trap, showing its construction and the bait inside. The 



most effective bait was geraniol emulsion, sprayed on peach foliage which 

 was suspended in the center of the trap. 



