260 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 13 
“Higueral, R. D., March 4,1914. Observed today, from window of my laboratory, 
a very considerable migration of large sulphur butterflies, Catopsilia ( Callidryas ) 
eubule, flying about northwest at an average height of ten to fifteen feet—some 
higher, but none close to ground. They linger at no flower or bush, and the flight 
is very rapid.” 
“March 5. The migration of sulphur butterflies continued throughout the day, 
they flying in the same direction as yesterday. As the larvae of this genus breed on 
the species of Cassia and Pithecolobium, so large a number of adults must have ma¬ 
tured in the scrub growth of Pithecolobium along the seacoast near Romana. It is 
evident that the large yellow Spilochalcis, that infests the pupae and keeps this species 
in check in Porto Rico, does not occur in any abundance on this island.” 
E. Graywood Smyth. 
Roach Control. For several years the buildings of the Michigan Agricultural 
College have been the home of a flourishing colony of the large American roach, 
Periplaneta americana. The tunnels through which heat, water and electric power 
are distributed over the campus afford the best of facilities for the roaches to take 
advantage of changes in food supply and various comforts appreciated by roaches. 
During all this time the pests have been baited with everything which we supposed 
might be tempting to a rather well-fed roach, but with indifferent success, the 
roaches seeming to pay no particular attention to any of our offerings. Even Fluorid 
of soda, both as a dry powder, and mixed in flour, failed to do more than dispose of a 
few of them, and all this apparently because we had failed to provide an attractive 
bait in which to place poison. Finally it was noticed that the roaches love to collect 
on barrels of fermenting honey and water used in making honey vinegar, apparently 
attracted by the fermenting liquid which seeps through. Accordingly, a thin gruel 
of cotton-seed meal sweetened with a little molasses was cooked in a steam cooker and 
to this, when cool, was added a cake of yeast, and fermentation was allowed to start, 
after which a smalFquantity of dry, powdered arsenate of lead was stirred in and the 
offering placed in plates accessible to the roaches. The outcome was really gratify¬ 
ing. The first attempt resulted in the death of several hundred roaches. It is neces¬ 
sary to moisten the bait about once a day since the bait becomes ineffective as soon 
as it dries out. 
R. H. Pettit. 
Historic Credits. Sanderson, in his Insect Pests of Farm, Garden and Orchard, 
figure 80, page 109, credits the illustration, following Riley, to Price, only to receive 
recently a letter from that gentleman, kindly placed at our disposal, to the effect 
that while he made the drawing of the “ hopperdozer ” it was by no means his in¬ 
vention, a credit that he never claimed. The figure was drawn by Mr. Price more 
than forty years ago when he was a youth and only recently had his association there¬ 
with come to his attention, hence the belated note. The inventor of the useful 
“hopperdozer” has been forgotten, apparently. 
E. P. F.. 
/ 
