ACADEMY OP NATURAL SCIENCES. 127 



FAM. LlMENITIDjE. 



Limenitis Fabr. 

 Limenitis Lorquini Boisd. 

 Like its congeners in other parts of the world, this species occurs in shady 

 woods, or on the banks of arroyos. It is peculiar to California and Oregon. 



Limenitis Eulalia Doubleday. 



In localities similar to the preceding species. These two species are, as yet, 

 the only ones found in our State. They represent a peculiar type, forming, in 

 their coloration, a transition from Limenitis to the South American genus 

 Heterochroa. Neither of these Californians have been found on the Eastern 

 Slope. L. Eulalia extends to Mexico. 



The family Apaturidce as yet, has not been found in California. 



Dr. Trask offered the following article : 



Earthquakes in California During the Year 1863. 



BY JOHN B. TRASK, M.D. 



During the year 1863 we have had but five earthquakes, and as in former 

 years they have been marked by no serious event, if we except the light degree 

 of fright induced at the time among our people. 



January 25th. — A severe shock was experienced at San Diego at 2h. 20m. 

 m., which lasted five to eight seconds. There was no undulation in this case, 

 it consisting of a series of sharp jars. It was preceded by a deep rumbling 

 noise. 



February 1st. — A very smart shock at the Mission San Juan, Monterey 

 County, at 4h. lm. p. m. This shock was felt at Gilroys at 4h. 15m. This 

 town is twelve miles east of the former. At both places the shock was marked 

 by the undulatory motion. It was not observed at Monterey, which is nearly 

 twelve miles west of the Mission. 



June A smart shock at midnight at San Francisco. 



August 1st. — Two light shocks at San Francisco, at lOh. 48m. p.m., and at 

 llh. 6m. p. m., another shock. 



December 19th. — At 2h. 38m. p.m. a smart shock was felt throughout the 

 city ; directly afterwards another and more severe one occurred. The first was 

 a short, sudden jar, while the second was undulatory. The accuracy of the 

 telegraph operator at Santa Clara has enabled us to form a correct idea of the 

 course of this shock, and to correct to some extent the popular errors relating 

 to the direction of the seismic wave. His time was 2h. 44m. 31s., being 

 within 29 seconds of true time, which would then be 2.45. This gives us 

 only &% minutes difference in elapsed time, and gives for the direction of the 

 wave an east course in place of north and south, as reported, which corresponds 

 to our measured observations here. I take this opportunity of expressing the 

 thanks of the Academy to this operator for his accuracy and kindness in fur- 

 nishing us data in this and other phenomena of scientific and public interest. 



