484 Phylum Arthropoda 



The larva will develop and molt inside the piece of cornstalk within 

 the tin box, and will pupate also within the stalk. Or, as the time for 

 pupation approaches, the pieces of stalk may be removed to a small 

 bell jar on the bottom of which is a layer of heavy loam. The larvae 

 will go into the soil to make an earthen pupal cell. The most satis- 

 factory method, however, is to keep them through the pupal stage in 

 the tin boxes where their development may be observed more easily. 

 When the adults emerge they may be placed in jelly glasses or small 

 bell jars and the life cycle begun again. 



Family scolytidae 



METHOD FOR REARING SCOLYTUS MULTISTRIATUS 



Philip A. Readio, Cornell University 



THE following method of rearing Scolytus multistriatus in numbers 

 is that followed by the Cornell University entomologists, working 

 in conjunction with members of the Plant Pathology Department, in 

 their investigations of insect transmission of the Dutch elm disease 

 organism, Ceratostomella ulmi. 



Wood from recently felled elms is cut into convenient lengths (we 

 use sticks about 2 feet long, and from 4 to 8 inches in diameter), par- 

 affined thoroughly on the cut surfaces, and placed in suitable cages. Our 

 cages are 1 foot wide, 1 foot high, and 2 feet long, of wooden frame and 

 wire screen construction. Into this cage newly emerged beetles are 

 introduced; they start almost immediately to tunnel into the elm 

 wood provided. We have found that the providing of fresh elm twigs, 

 for the so-called "maturation feeding" of newly emerged adults before 

 reentrance into fresh wood for oviposition, is unnecessary, and is taken 

 advantage of by very few beetles. From cultures of this type we 

 harvest a good yield of vigorous, off-spring beetles, after a period of 1% 

 to 2 months, depending on the temperature. Furthermore, it is possible 

 to obtain a second off spring generation from the same wood if it is not 

 too thoroughly used up by the first generation larvae. 



PITYOGENES HOPKINSI* 



IN ORDER to secure large numbers of the specimens in each of the 

 stages in which growth and development occur, adult beetles were 

 collected from dead pine limbs in the field, placed on freshly cut green 

 pine in breeding jars, and kept at a constant temperature of approxi- 



* Abstracted from an article in Ann. Ent. Soc. Amcr. 20:522, 1927, by James A. 

 Beal. 



