Scarabaeidae 473 



obtained from pupae kept at constant temperatures ranging from 15 ' 

 to 35 C. (59° to 95° F.). 



Bibliography 



Baerg, W. J., and Palm, C. E. 1932. Rearing the rough-headed corn stalk beetle. 



/. Econ. Ent. 25:207. 

 Davis, J. J. 191 5. Cages and methods of studying underground insects. Ibid. 



8:i3S. 

 Hayes, W. P. 1929. Morphology, taxonomy, and biology of larval Scarabaeoidea. 



///. Biol. Monographs, 12, No. 2. 

 Ludwig, D. 1928. The effects of temperature on the development of an insect 



(Popillia japonica Newman) . Physiol. Zool. 1:358. 

 1930. The effects of exposure to cold on the embryonic development of 



the Japanese beetle (Popillia japonica Newman). Ibid. 3:291. 

 Phillips, W. J., and Fox, H. 1924. The rough-headed corn stalk beetle. U. S. 



Dept. Agric. Bull. No. 1267. 



A SUCCESSFUL METHOD OF REARING TRICHIOTINUS 



C. H. Hoffmann, U. S. Bureau of Entomology and Plant Quarantine 



IN ORDER to obtain eggs of Trichiotinus mated pairs were confined in 

 3-ounce salve boxes partially filled with small particles of damp 

 wood. The wood was carefully examined for eggs every other day and 

 moisture added if necessary. To avoid desiccation, the eggs obtained 

 were quickly transferred to cavities in dampened soil within 2 -ounce 

 salve boxes, and covered with soil to conserve moisture and prevent 

 losses due to the attacks of parasitic fungi. Even though it consumed 

 much time, the soil was changed every second day until hatching oc- 

 curred. Not over 10 eggs were isolated in each box, and often a perfect 

 hatch was obtained. Upon hatching, each grub was carefully trans- 

 ferred to a 2 -ounce salve box, which had been previously supplied with 

 relatively small particles of moist decaying wood. Here the larva 

 remained until maturity or death. These salve tins were kept in a 

 basement which maintained a rather uniform temperature of 23 ° C. 

 The boxes were examined every other day and new food or a few 

 drops of water from an eye dropper were added if needed. Moisture is 

 undoubtedly the most difficult factor to control properly in the rearing 

 of wood-inhabiting forms. The usual tendency is to over-water, which 

 is far more injurious than under-watering. 



Other scarabaeids and lucanids, which develop in decaying wood, 

 were also reared to maturity in salve boxes containing small particles 

 of moist wood. One species of Trichiotinus has been reared through 

 consecutive generations in the laboratory. 



