202 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



by half squares. This serves to bring out quite clearly the 

 fact that the variation is largely geographic. 



The localities arranged according to the number of gastro- 

 steges in specimens which represent them are as follows : 



200 Gastrosteges 



Santa Cruz Island, Santa Barbara County^ 

 Corralitos, Santa Cruz County 



209 



Inverness, Marin County 

 San Juan, San Benito County 

 Callahan, Siskiyou County 

 Roseburg, Douglas County, Oregon 



210 



Goose Lake Meadows, Modoc County 



Napa, Napa County 



Pismo, San Luis Obispo County 



211 



Lagunitas, Marin County 



Edna, San Luis Obispo County 



Camas Mountains, Douglas County, Oregon 



Santa Cruz Island, Santa Barbara County 



212 



Santa Cruz Island, Santa Barbara County 

 Palo Alto, Santa Clara County 

 Palo Alto, Santa Clara County 

 Palo Alto, Santa Clara County 



213 



Berkeley, Alameda County 

 Berkeley, Alameda County 

 Berkeley, Alameda County 

 Palo Alto, Santa Clara County 

 Duncan Mills, Sonoma County 



* All localities in California unless otherwise stated. 



