204 UMAX. 



yellowish ash, often brownish in the middle, with dark lateral 

 zones, pulmonary aperture posterior, light, usually brown- 

 margined; sole thin, pallid, nnicolored; mucus wateiy, very 

 copious. Europe, Iceland. 



The S3 r non} T ms include L. sylvaticus, Goldfuss ; L. scandens, 

 Normand ; L. scopulorum, Fab. ; L. flavescens, Clark; L. glau- 

 cus, Clark ; L. sa/2cr??i,Bouillet; L. limbatus, Held ; L. arborum, 

 Bouch. ; L. Livonicus, Schrenck ; L. scandvns, Norm. ; L. roseus, 

 and L. coloratus, Broeck ; L. altilis, Fischer ; L. Helveticus, 

 Bourg. ; L. Dianse, Kimakowicz ; L. Heynemanni, Bielz. Some 

 of the above have been described as varieties, to which may be 

 added the following from Lessona and Pollonera's monograph : 



Yar. TYPUS (L. arbor um, Bouch.). Violet ash, bluish ash or 

 brownish, with a median light zone, cariira short; shield 

 with two dark zones. 



Var. NEMOROSUS, Baudon. Like the preceding but with two 

 dorsal dark zones in addition, usually maculated on the 

 sides. 



Yar. BETTONII, Sordelli. Like the preceding, but maculated 

 additionally with brown and white on the back ; shield with 

 a median brown zone and alternating whitish and brown 

 zones on the sides. 



Yar. ALPESTRIS, Lessona and Pollonera. Smaller, with longer 

 carina, back unicolored with a light median zone ; shield 

 often with confused blackish zones. 



Yar. FALLENS, Lessona and Pollonera. Light colored, with a 

 lighter small zone, and longer carina ; shield light colored 

 with obscure zones. 



Yar. RUPICOLA, Lessona and Pollonera. Small, blackish, with or 

 without an obsolete dorsal zone ; carina long. 



L. Mongianensis, Paulucci, described as a variety, has been 

 separated as a species by Lessona and Pollonera. It cannot be 

 distinguished from marginatus externally, its characters being 

 anatomical. 



L. ECARINATUS, Bottler. PL 50, fig. 89. 



O 7 O 



Resembling L. marginatus, but the shield shorter, broader, 

 almost without caudal carina, concolored, rugae smaller, shorter, 



