oe fui ahs Bh 
iad "MONTHLY LETTER OF THE BUREAU OF ENTOMOLOGY 
_-—s,sSWW NITED STATES DEPARTMENT OF AGRICULTURE 
































_ MOVING LIGHTS VERSUS STATIONARY LIGHTS IN PHOTOTROPISM EXPERIMENTS. 
cently, the writer had the opportunity of witnessing the operation of a ; 
designed to capture the adults of injurious species of insects. A light was 
attract the insects, and on flying near the burner a powerful suction of air 
ad by a gasoline engine whirled them into an inner chamber with such. force as : 
i the softer ones and cripple the “harder species such as beetles amd grass-- 2 
a The machine was mounted on a truck which was drawn along the edges of the 7 
of a sugar plantation. Whether it is really efficient has not been determined, — 
it is not now being 2 eta there has been no further opportunity to observe 
ction. 
t was noted that considerable numbers of m 
gma frugiperda, especially gravid fe wee were attracted by the light. 
OSE species are seldom found at trap lights which have been operated at Audubon 
or several years, it would seem that there must be a difference between these 
and the light used in the aoe ‘ toi Soc tn 4s various Stabe! oa) and . 






f moths of Diatraca saccharalis and 
me 
mong the fields and thus attracts one group of insects after another. In 
the attraction of group after group could very readily be noted. When the 4 ries 
were abundant the truck was stopped for one or two minutes, and when the cloud 
asects had disappeared, either settling again or being sucked into the machine, 
les were started and the machine was driven a few yards further on. Possibly, 
uere motion of the light exercised some attraction which stationary lights do 
possess. Other possible factors are the noise of the gasoline engine and the 
ng of the mules and operators of the machine through the grass, the noise and 
neral disturbance probably pightae more insects to fiy than would have been 
ted solely by the light. TT. £. Holloway. 
NATHAN BANKS GOES TO CAMBRiDGH. 
Nathan Banks has resigned from the service effective November 1 to ace enh. a 
lon as Curator in the Museum of Comparative Zoology of Cambridge. Mr. Banks . 
3 been in the service since 1890 with the exception of a period of five years: andy 
© in 1897. His wide knowledge of the literature, and of the taxonomy of various 
“of insects have made him a highly valued member of the corps Unfortunately, 
me little time.at least, he will not be able to carry on bystematié work and 
determinations. He states that his new position is that of a curator, and he 
Ss to be fully occupied with "curating." ; 
LIVE SPECIMENS DEoTRED, 
‘The cowpea, Weavil (Bruchus [Pachymerus] chinensis). 
The pink cornworm (Batrachedra rileyi) 
i, H, Chittenden, of the Bureau of Entomology, will appreciate sendings of the 
1 ae gc’ Species. Pack in box with food sufficient to insure arriving in 
