112 ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



Mr. Fletcher stated that Bordeaux niixture seems to repel the 

 cucumber flea-beetle; but it is claimed by hop growers in British 

 Columbia that neither Bordeaux nor Disparene is effective for con- 

 trolling PsijUiodes i)unct\dat(i Melsh., which is a most serious pest 

 in hopyards there. He asked for suggestions as to a remedy. 



Mr. Titus stated that the species of this genus work on sugar beets, 

 and that they can be driven away during irrigation by disturbing 

 the beets, thus causing the beetles to jump into the water and be 

 swept away. 



Mr. Hooker stated that Lindeman had described Thrips tahaei from 

 Russia several years ago, and reported that it attacked tobacco in that 

 country. This species is distributed from New England to Texas, 

 but feeds u]3on onions. He asked if anyone present had observed 

 it on tobacco. 



Mr. Quaintance thought it probable that Lindeman had confused 

 two or more species in his account of the life history of Euthrips 

 tabaci Lind. It is stated by him that this sj^ecies infests tobacco and 

 deposits its eggs along the veins. With the American insect desig- 

 nated under this n.ame, the eggs are deposited beneath the epidermis 

 of the leaf, and there are other equally important points of difference 

 in the habits and life of the species. So far as he knew, they never 

 attacked tobacco, but infested onions (producing the so-called '^ silver- 

 top ") , cabbage, cauliflower, etc. He had frequently seen these insects 

 very abundant on the above-mentioned plants in proximity to tobacco 

 fields in Florida, but the insects did not attack the tobacco. 



Mr. Hinds stated that there w^as considerable confusion in regard 

 to the species of thrips. 



Mr. Washburn mentioned finding the cigarette beetle in boxes of 

 fine-cut tobacco. 



The following paper was presented : 



OBSERVATIONS ON CECIDOMYIID.ffi. 



By E. P. Felt, Albanij. X. Y. 

 [Withdrawn for iiublication elseSvhere.] 

 A paper was presented entitled : 



A SPRAY NOZZLE FOR THE MECHANICAL MIXTURE OF OIL WITH 

 WATER OR OTHER LIQUIDS. 



By E. DwiGHT Sanderson, Durham, N. H. 



During the year 1900 the writer made a series of tests of the 

 oil and water mixing pumps at the Delaware Experiment Station. 

 Practically all of such pumps on the market were thoroughly tested, 

 using various nozzles, single and double hose, simple and double 



