se 
is identical with that of normal pupae from larvae that were reared 
with food at the same time in the incubator. The remaining three 
larvae all died in the course of the month, the last survivor dying 
as late as January 26. In a check series with wheat available as 
food, 65 percent came through to adults. Evidently larvae of the 
Japanese beetle emerging from hibernation, but having no access to 
an external scurce of food, may under exceptional conditions be en- 
ablead te complete their development and change to adults. In most 
cases, however, the larvae die after varying lengths of time before 
reaching the pupal stage. 
Control of the adult beetle by means of mechanical tra»s.--A 
report covering the various tests conducted durin:;; the summer of 1933 
has been completed by F. ii. Metzger. A summary of this report fol- 
lows: During the summer of 1933 seventy tests were conducted with 
various typ,es of traps and bait. Four hundred traps were employed in 
this work from June e&7 to sugust 20 and 15,645,000 beetles were cap- 
tured. «A trap was devised with operiings in the funnel which captures 
approxinately one third more beetles than traps having no funnel 
apertures. This trap can be manufactured nearly as cheaply as the 
type formerly reccommended. « wide range in the size of the apertures 
in the bait container is pussible without loss of effectiveness. This 
range covers 64 to 169 apertures per square inch of surface. Traps 
with licuid bait located in a container above the funnel are much 
more effective in catching beetles than are traps with liquid bait 
located in a cylinder Delow the funnel. The Japanese beetle prefers 
ultra-viclet light to the visible rays, but traps painted with a 
material which reflects ultra-violet light captured fewer beetles than 
tras painted with material that did not reflect these rays. Green 
and white traps caotured more beetles than traps painted entirely 
green, when the different colored devices were placed 10 feet apart 
to prevent beetles from having an opportunity to choose between two 
cclor combinations. Traps made entirely of aluminum captured as 
many beetles as green and white traps, but the bait was volatilized 
much more rapidly in the former because of the location of the bait 
bottle within the beetle container. Traps with funnels 4 inches in 
length captured fewer beetles than traps with funnels 7 inches long. 
Phenyl ethyl alcohol increased the attraction of geraniol and eugenol, 
but available data are not sufficient to warrant recommending the ad- 
dition of this material to the bait, because cf certain developments 
in specifications. Neither methyl heptine nor geranyl acetate car- 
bunate increased the attractiveness of the standard bait. A wick + 
inch in diameter, exposed 3 inches, is the nost satisfactory length 
to employ in traps where the bait container is located above the 
funnel. Wicks of larger diameter may be employed if the total area 
of exvosure is comparable to that of a $-inch wick, projecting ¢ 
inches from the container. Pumice or plaster of paris, impregnated 
