460 



applicants, giving a brief history of the case, and the examiner of pat- 

 ents rejected the claims of the woald-be pS^tentees. The latter then em- 

 ployed an attorney and sent him to Washington to argue their case 

 before the Commissioner of Patents, and a patent was finally granted to 

 them in the month of January, 1891. 



After I had made a large series of experiments with hydrocyanic 

 acid gas several other persons also made a number of experiments 

 with it, but as these have not been made public except in a few in- 

 stances I am unable to give an account of them in this place j however, 

 these experiments did not contribute to the perfecting of the successful 

 use of this gas, and are therefore of little or no interest except to the 

 persons making them. While carrying on my experiments at Orange 

 in the month of September, 1889, as detailed above, Mr. Bishop in- 

 formed me that he and Dr. Wall had made some experiments with 

 this gas, these experiments dating from the autumn of 1887. He 

 also informed me that they had obtained the best results by using the 

 cyanide dissolved in water, and diluting the sulphuric acid with water 

 priortomaking the testsj but a number of these experiments which I 

 repeated under his direction did not produce the same results that he 

 reported having obtained by them. Mr. A. H. Alward, of Orange, in- 

 formed me that he had also tried the diluted acid but had not obtained 

 as good results as when he had used the pure acid. 



SOME OF THE BRED PARASITIC HYMENOPTERA IN THE NATIONAL 



COLLECTION. 



(Continued from p. 158.) 



Family ICHNEUMONIDiE. 



Subfamily Tryphoninae. 



Parasites. Hosts. 



Bassns agilis Cr Syrpliid puparium. June 14, 1884. 



Bassus sycophanta Walsh Gall on oak ( Q. ohtiisiloba). Apr. 25, 1870. 



Bassus scutellatus Cr Leucania unipuncta, seemingly ovipositing 



on. Huntsville, Ala., May 11, 1882. 

 Bassus syrpliicola Ashm Syrphid with Rose Aphides. San Francisco^ 



Cal., Apr. 29, 1881. 

 Collected, Los Angeles Co., Cal. 

 Bassus orbitalis Ashm Syrphus larva on Cabbage, ovipositing on. 



Alameda Co., Cal., Aug. 

 Bassus xanthopsis Ashm Syrphus feeding on Aphis Irassicce L. Ala- 

 meda Co., Cal., Nov. 

 Bassus euurse Ashm Saw-fly {Euura sp. ?) on Willow. Placer 



Co., Cal. 



Bassus maculifrons Cr Syrphus on Orange. Los Angeles Co., Cal. 



Collected ovipositing on Syrphus larva 



feeding on Cabbage Aphis. Alameda Co., 



Cal., Oct. 



