36 COCKERKLL AND COLLINGE : CHECK-LIST OF SLUGS. 



4. Black, mouth not pale, sole olivaceous, unicolorous, 



length 46 mm. 



5. Black, mouth hardly pale, sole with central zone 



pale olivaceous, lateral zones black, and each 

 broader than central, length 37 mm. 

 So far as external characters go, specimens i and 2 

 should be nobrei, and 5 da^ihre, while 3 and 4 seem some- 

 what intermediate. It is hard to believe they are not all 

 mutations of one species. 

 376 a-c. The grey forms of sitbfiiscus may be distinguished as 

 follows : — 



T. Banded — (a) bands distinct, sole yellowish = ciuereojuscus. 



sole whitish = typus. 

 (b) bands indistinct ... ^krynickii. 



2. Bands wanting ... ... ... ^g>'isciis. 



'•'• fasciis-obsoletis''' {Coiic/i., 1893, p. 115) is perhaps only 

 a descriptive term from a label written by Mr. Pollonera. 

 There is an unnamed form, found by Mr. Wilcock, which 

 is like cinereo/uscus, but has an orange foot-fringe. 

 376 e. g. The reddish forms may be separated thus : 



1. Banded : 



(a.) reddish, bands black - fufofuscus. 



{b.) yellowish, bands brown = mabilliaHus. 

 if.) orange = aurantiaais. 



(^/.) brick-red =rufesi-eiis. 



(e.) greyish red, bands h\ackish = c7fJosn7rum. 



2. Bands wanting : 



(a.) yellowish, margin greyish ^gaudejroyi. 



(b.) yellowish, margin yellow ~ sticcineus. 



(c.) brick-red, margin grey —lateritius. 



Of course these forms run into one another. The form 

 aurantiacus, as described by me, is bright orange, with the 

 bands ill-marked {Sci. Goss., 1886, p. 187). It may not 

 be the same as Locard's undescribed form, but in all 

 probability it is. The form vorinanui^ Loens, 1890, is 

 almost precisely the same thing, perhaps tending rather to 

 succmeus. Var. audosianiin seems very close to Pollonera's 

 later described v. alpestris, but the latter is sometimes with 

 four bands. 



According to Pollonera, Avion olivaceiis, Schmidt, is the 

 same as var. gaudefroyi. I have not had the opjjortunity 

 of consulting Schmidt's description, but if the names are 

 synonymous, olivacejis has many years priority. 



