Dark stripe on right side of mantle passing above the respiratory pore 

 A^rion circumscnptus Johnston 



105. Sole with two lengthwise grooves; tail normal; Cal. 



Anadenulus coc\erelli (Hemp.) 

 Sole plain; with a narrowed area around the body about two-thirds of 

 the way back, which may be self -amputated, in most species; Pacific 

 states into Idaho 106. 



106. Sides with oblique lines only; no light or dark mid-dorsal stripe 



Prophysaon coeruJeum Cockerell 

 Sides with cross lines between the oblique lines; usually with a light or 

 dark mid-dorsal stripe 107. 



107. With a dark mid-dorsal stripe 



Prophysaon vanattae Pilsbry 

 Usually with a light mid-dorsal stripe 108. 



108. Respiratory pore about central in mantle; about 2y2'' long 



Prophysaon andersoni (Cooper) 

 Respiratory pore slightly anterior in mantle; getting to be 3 to 4 inches 

 long 



Prophysaon foliohtum (Gould) 



109. With a caudal mucous pore; sole indistinctly in three lengthwise sections; 



western species 110. 



No caudal mucous pore; sole distinctly grooved in three lengthwise sec 



tions 112. 



110. Caudal pore deep and open; less than 2" long; Cal. 



Hesperarion hemphilli (Binney) 

 Caudal pore filled with spongy tissue; larger 111. 



111. Mantle free for about one-fourth of the way back from the front mar' 



gin; yellowish or brownish, with dark dashes; Cal. 



Ariolimax calif ornicus Cooper California Garden Slug 

 Mantle free for about one-third of its length; yellowish or greenish, with 

 dark dashes or blotches; Pacific states 



Ariolimax columhianus (Gould) Columbian Garden Slug 



112. Back with two or three unbroken dark stripes; about two inches long; 



a European species found in greenhouses and introduced into Cali- 

 fornia 



Limax marginatus Miiller Striped European Slug 

 Stripes on back usually broken or absent 113. 



113. Sides with lengthwise stripes or rows of blotches; large animals, getting 



to be 5" or 6" long 114. 



Small (about 1" to 2" long), plain colored or irregularly spotted 



slugs 115. 



114. Color brownish, with gray blotches; a European species found in green' 



houses and widely distributed throughout the U. S. 

 Limax flavus Linn. Spotted Slug 

 Color brownish, with black blotches; a European species established in 

 various parts of the U. S. 



Limax maximum Linn. Giant Spotted Slug 



126 



