COCKERELL AND COLLINGE : CHECK-LIST OF SLUGS. 2I3 



However, the slug is probably only subspecifically distinct 

 from A. subfuscus, to which it may be allied through such 

 forms as vormanni. 



Simroth has shown that intermedins {minimus) is quite 



distinct from all subfuscus forms, and consequently whether 



campestris is a variety or sub-species of subfuscus, or an 



allied species, it ought not at the present day to be 



confounded with intermedins. But the outward similarity is 



such, that in dealing with the old descriptions we can 



hardly come to any certain judgment. Simroth has 



remarked, however, on the large size of Midler's flavus, 



which seems to distinguish it from intermedins. 



Midler's Arions have always been a source of perplexity, and 



it may not be amiss to give some account of them for the 



benefit of those who cannot consult the original work. 



O. F. Midler. — Verm. Terr.et FIuv. His t., vol. 2 (1774). 



p. 2. Limax ater. The first variety is the Linnean 



ater. The fourth variety " fusco-castaneus, ora 



lutesante ; subtus atbis," is said to be L. subrufus, 



Linn. 



p. 4. Limax a/bus. With four varieties. 



p. 7. Limax succineus. " L. supra subrufus, subtus 

 a/bus." "Long. \\ unc. Rufo-juscus vel succini 

 coloris est absque maculis aut cingulo. Tentacula 

 majori superne nigra ; inter haec tinea obscura." 

 With reference to L. subrufus, L., Syst. 3, and 

 Hill, Anim. p. 87, I.e. Midler here makes some 

 mistake, as L. succineus and L. aterxar. (as above) 

 either should not be separated, or are not both 

 subrufus, L. 



p. 9. Limax ductus. Two inches long, yellowish, 

 amber above, white beneath, band and back with 

 grey bands. What is this ? A form of subfuscus ? 

 It is to be noted that this is the first banded Arion 

 ever named, so whether it might be subfuscus, 

 intermedins, hortensis, or what not, it has priority. 

 Morch has reported A. cinctus from Iceland. 



p. 10. L. flavus, see above. 



p. 11. L. fuscus. Reddish with black tentacles, white 

 beneath. " Linca laterali dorsoque nigricante.'" 

 Length 8 lin. 



