December, '14] TARTAR: VALUATION OF LIME-SULFUR 463 



Mr. A. A. Giraiilt of Australia has reported that the Mymarid egg- 

 parasite of Delphax saccharivora Westw. which occurs in Porto Rico is 

 Anagris armatus (Ashmead). 



At Rio Piedras during January, 1914, two species of thrips were 

 taken from cane leaves on which characteristic thrips injury was 

 noted. These were referred to Mr. J. D. Hood of the United States 

 Bureau of Biological Survey, who has described one species as new to 

 science, under the name Haplothrips (?) tibialis. The other species 

 Heliothrips femoraiis Renter, represented by a single female, is, accord- 

 ing to Mr. Hood, an abundant and destructive pest in the greenhouses 

 of Finland, Sweden, Belgium, England, Italy, and the United States, 

 its native home being open to conjecture.^ 



The mite which feeds upon the stalks of sugar cane, beneath the 

 leaf-sheaths, Mr. Banks has identified as Tarsonemus spinipes Hirst. 

 Although it was not described until 1912, this mite has been known to 

 attack sugar cane in the West Indies for many years. Mr. W. Nowell, 

 now Mycologist of the Imperial Department of Agriculture for the 

 West Indies, well describes the injury it produces, as follows: "Causes 

 small red blisters on the surface of the j'oung internodes of sugar cane 

 while still in the sheathing canes, which are also to some extent affected. 

 Results in a reddish-brown corroded appearance of the surface of the 

 cane, especially a streak above the eye."^ 



The mite which has been found working on the leaves of sugar cane 

 Mr. Banks pronounces to be a species of Teiranychus, perhaps new. 



ON THE VALUATION OF LIME-SULFUR AS AN 



INSECTICIDE 3 



By Herman V. Tartar, Corvallis, Ore. 



At the present time, the object of the examinations made of samples 

 of commercial hme-sulfur solution, in different chemical laboratories 

 throughout the country, is to ascertain data regarding composition. 

 In many cases, simply the total lime content, total sulfur content, and 

 specific gravity are ascertained. Oftentimes, however, quantitive de- 

 terminations are also made of the different forms of sulfur in combi- 

 nation. Entomologists and horticulturists, making field experiments, 

 generally use a gravity test only. 



^ Insecutor Inscilioe Menstruus, Vol. II, No. 3, 1914. pp. 38-41. 

 2 Bulletin of Entomological Research (London), Vol. Ill, Pt. 3, Nov., 1912. p. 328. 

 » Contribution from the Chemical Laboratory of the Oregon Agricultural Experi- 

 ment Station. 



