
an. bie 
T. E. Holloway, New Orleans, La., reports: "We continued to 
receive and release parasites from Peru. The last shipment of the fly 
Paratheresia claripalpis V. d. Wulp has been received, but flies are 
Still emerging and being released from puparia now on hand. H. A. Jaynes 
sent us a total of 444,017 puparia during the summer. The sending of 
such a large number of puparia was made possible by Mr. Jaynes's organiza-— 
tion of native collectors. He deserves much credit for his industry and 
initiative. Shipments of the wasp Ipobracon rimac Wolcott are still 
arriving." Shipments in the new crate (described in the July Monthly 
Letter) have been so successful that as many as 84.4 per cent have been 
received alive, 
Control experiments conducted by W. B. Noble against sod web-— 
worms at Columbus, Ohio, are reported by C. M. Packard, who says: "Kero-— 
sene emulsion, costing 1/6 cent per square yard for materials, and pyre- 
thrum extracts, costing about 3 1/2 cents per square yard for materials, 
were found very effective and practical for use on lawns and golf greens. 
Lead arsenate dust used as recommended by J. S. Houser was fairly ef-— 
fective but slower in action, less efficient, and more trouble to apply." , 
Reporting on grasshopper investigations at Bozeman, Mont., J. R. 
Parker says: "Ecological studies of Camnula pellucida Scudd. were 
conducted on the area under annual observations at Lakeview, Mont., by 
H. M. Jennison and Fred Morton during the first half of August, and by 
Dr. Jennison and J. R. Parker from August 19 to August 25. These studies 
have already shown that various species of grasshoppers are rather close- 
ly restricted to certain plant associations and that a knowledge of the 
associations preferred by C. pellucida will be of great value in scouting 
and conducting surveys for this particular grasshopper." 
re cere cm cre ee meee a ce cee ce ee 6 Se me ee oe aE one me 
COTTON INSECTS 
Dusting experiments against the cotton leaf perforator (Buccu- 
datrix thurberiella Busck) at the Calexico, Calif., sublaboratory are 
reported by T. C. Barber, who says: "During the month (August) a large 
series of small-scale dusting experiments were conducted, utilizing eight 
different insecticides. These eight insecticides included lead arsenate 
(which gave the best results in the last year's work and was used again 
as a key insecticide to check the results obtained from the new com- 
pounds); barium fluosilicate; sodium fluosilicate (Levosol) in two combi- 
nations, light and extra light; synthetic cryolite; and three sulphur 
combinations, ground, flowers of, and flotation, the latter combination 
containing 20 per cent of flotation sulphur in 80 per cent of ground sul- 
phur. * * * the best results were again secured from lead arsenate, fol- 
lowed in turn by barium fluosilicate and flotation sulphur. The barium 
fluosilicate, however, gave indications of being the most lasting and 
persistent of the different insecticides, excelling even the lead arsenate 
in the longer-continued tests, although lead arsenate invariably led in 
the earlier examinations after dusting." 
