Mr. Ehrenberg stated that the copper ores in the vicinity of La Paz, and Mineral City, Arizona, were generally argentiferous, sometimes giving results by assay as high as $200 per ton. The ores beyond that district did not appear to contain much. The quicksilver ore at the Eugenie vein contained both silver and copper. Doctor Behr presented the following paper: Notes on Californian Satyrides. BY HERMAN BEHR, M. D. CHIONOBAS NEVADENSIS. Boisduval, _in litteris_. A few specimens of this new and as yet undescribed _Chionobas_, were caught by Mr. Lorquin, the discoverer of the species, and named by Dr. Boisduval. Not possessing a single specimen of this rare species, I am not able to give a diagnosis, and have only an indistinct recollection, that the species bore most resemblance to the _Gerontogeic_, Ch. Tarpeja, a Siberian species that has also been found on the summit of the Appenines, in Italy, but that in size it is superior to any _Chionobas_ known to me. SATYRUS STHENELE Boisd. Is rather common near San Francisco, where it is found in June. Only one generation annually. SATYRUS SYLVESTRIS Edwards. Edwards’ description shows very clearly the marks by which _S. Sylvestris_ can be recognized from _S. Sthenele_. This species is found on grassy hills thinly covered with live-oak, where its habits show a very marked difference from those of its relations, by preferring the underside of oak branches to any other seat, while _Sthenele_ and _Boopis_ almost exclusively settle on the ground. SATYRUS BOOPIS Behr. Sthenele similis at limbus non tesselatus, sed linea transversa distincte partitus et fœminæ ocelli alarum superiorum in fascia dilutiori positi. Alae subtusdimidiatæ pars radicalis brunnea, marginalis grisea, marginem versus brunnescens. Utraque marmorata, halone ocellorum in alis anticis solo excepto dilutiori et concolori. This _Satyrus_ is the biggest of our Californian species, the male being nearly double the size of the female of _S. Sylvestris_. I find this _Satyrus_ in July in Contra Costa, on the hills as well as on the plains. In regard to the diagnosis of these three closely allied species, I would mention, that the presence or absence of one or two more or less distinct eye-marks, on the upper or under side near the anal angle of the hind wings, is of no diagnostic importance. S. ARIANE Boisd.