1881.] Entomology. 145 
much as we have done, except that he refers the two lower pal- 
pigerous pieces, with a question, to the labrum (misprint for 
abium ?) which they cannot possibly be; they are evidently the 
maxilla. The upper lateral pieces bearing the antennz are much 
less conspicuous, judging from the description, in Bombylius than 
in Systcechus. The pupa of Bombylius, from Dr. Chapman's 
excellent description, differs in the greater prominence and some- 
what different arrangement of the cephalic spines, the anterior 
_ pair being stouter and more bent forward than in either of the 
genera we have treated of. Dr. Chapman speaks of these spines 
forcibly reminding him of the tusks of a walrus and of their 
admirable adaptation to tearing down the clay stopping and dig- 
ging through as “ with mattock and shovel ” the long burrows of 
the bee upon which it preys. The dorsal and anal spines are also 
much more prominent than in our locust-egg parasites. The 
pupa of Systoechus and Triodites, not being under the necessity 
of such strenuous digging, have a less formidable armature; other- 
wise there is strict structural correspondence with Bombylius.— 
C.V. Riley. 
EXPERIMENTS WITH PyRETHRUM: SAFE REMEDIES FOR CABBAGE 
Pyrethrum were made, at our request, by Prof. A. J. Cook, of the 
Michigan Agricultural College, at Lansing. They are interesting 
as confirming all that we have hitherto said in recommendation of 
this powder for the imported cabbage worm, no safe and satis- 
factory remedy for which had been discovered before we recom- 
mended this powder and showed that it could be economically 
used when simply mixed with water. Its value, used in this way, 
for the Colorado potato-beetle as a substitute for the more dan- 
gerous arsenical compounds will at once be appreciated.—C. V. R. 
Sept. 27, 1880.—I placed ten cabbage caterpillars ( Pieris rape 
Schrank), in each of two small wooden boxes which were covered 
recover. A large number of the caterpillars on the cabbage 
plants were sprinkled or dusted with the Pyrethrum, the pro- 
portion the same as given above. In one hour the plants 
ee examined and in every case the caterpillars were found 
ead, 
The same experiments as those detailed above were tried with 
the potato-beetle (Doryphora 1o-lincata), Those in the boxes 
_were all down in fifteen minutes, both beetles and larve; nor did 
they recover. I watched those on the vines for twenty minutes, 
when several had fallen tothe ground. These were some distance 
