ACADEMY OP NATURAL SCIENCES. 283 



June, it frequents the flowers of the Pavia, on which the caterpillar probably 

 feeds, as does that of L. Piasus. 



20. L. exilis, Boisd. This species is rare, and so small that it might easily 

 be overlooked. It frequents low meadows and salt marshes, where it loves to 

 repose on the succulent stems of Salicornia, and on the flowers of Frankenia. 

 At present it seems to be the only Califoruian representative of L. Telicanus 

 and Bocticus of Europe ; but I think that several species of this type will be 

 found in Southern California, when that part of the State has been better 

 examined. I have a specimen of L. exilis, collected by Baron de Terloo, in 

 the Sierra Madre, between Mazatlan and Durango ; and I received, from the 

 same gentleman, several species of the same type from that locality. 



It is this type which is so numerously represented in the tropical regions of 

 the old world, and also in extra-tropical Australia. Our depauperated species, 

 L. exilis, with its two European congeners, are, so far as I know, the only ones 

 of this type which are found in the northern hemisphere beyond the tropics. 



All the other Californisju species belong to types of the temperate zone, and 

 are such as are rarely met with in tropical countries, or in the southern hemisphere 

 even out of the tropics. The type of Amyntula is the only one which has a 

 series of species in tropical Asia ; but, as far as I know, none in tropical 

 America. The type of Piasus, also, has some representatives in the tropics of 

 both continents, one of them being even identified with a species of Southern 

 Europe. 



As to the other types, these species are essentially endemic ; and eveu among 

 the Arctic species there seems not to be any amphigeic one. As the males vary 

 very little, and the females only on their upper side, there is little difficulty in 

 transcribing and recognizing them. If among our species there is any one which 

 is identical with an Atlantic ow>, it is probably Argyrotoxus, which may be a 

 local modification of L. Scudderi, Edw. 



Mr. Stearns read the following paper : 



List of Shells collected at Santa Barbara and San Diego by 

 Mr. J. Hepburn, in February-March, 1866. 



WITH REMARKS UPON SOME OF THE SPECIES, 



BY ROBT. E. C. STEARNS, CURATOR OF CONCHOLOGY, CAL. ACAD. NAT. SCIENCES. 



Through the kindness of Mr. Hepburn, well known as an enthusiastic and 

 intelligent collector, I have been permitted to examine the collections made by 

 him at the localities referred to, from which I have compiled the following list. 



The remarks in connection with a few of the species are not wholly based 

 upon the specimens obtained by Mr. Hepburn, but rather upon specimens re- 

 ceived by me from various sources, and forming a portion of my private collec- 

 tion. 



The figures in the left hand column refer to the numbers in Mr. P. P. Car- 

 penter's Supplementary Report (1863) to the British Association. 



