COCKERELL AND COLLINGE : CHECK-LIST OF SLUGS. 211 



Var. Jlavescens, Cllge., given as a synonym of succineus, is 

 yellowish, with bluish sulci (fide, Collinge in litt.). The 

 latter feature might possibly separate it as a sub-variety. 1 "' 



377. A. Justus. Muller's description is hardly sufficient to fix the 



exact race, as given by Pollonera. It seems that fuscus, 

 sens. Poll., cannot be separated as a species from subfuscus', 

 and if it is clear what Miiller intended, the name fuscus 

 must stand for the species, having priority. 16 



It may here be remarked that A. fuscatus, Fer., which has 

 been thought to be a form of juvenile A. (iter, is placed by 

 Pollonera in the subfuscus group, though with a query. 



378. A. bavayi. This, nivalis and euthynuanus, differ from sub- 



fuscus proper in the colour of the slime ; but although this 

 character has value in many cases, I do not think it can be 

 held to indicate distinct species in this group, as it is known 

 to be variable. 17 

 385. A. hortensis. The name concavus, applied to the shell only, 

 is earlier ; but I do not sec how it can be satisfactorily 

 identified. Turton (1831) makes Limacelhis concava, 

 Brard.. identical with Limacellus variegatus. The name 



fallax, Sterki, is also very uncertain in its application ; its 

 identity with A. bourgnignati has been suggested. 

 385 a. vii. There is some difficulty here. I have not seen the 

 description of fasciatus, 1830, but very probably it was 

 merely a wrong identification of fasciatus, Nilss., 1822, in 

 which case it has no standing. Pollonera cites limbatus 

 as equivalent to A. anthracius, Bgt, but 1 do not know 

 why, as Moquin's description precisely agrees with 

 A. hortensis, v. pelophilus. In either case the name 

 limbatus, Moq., cannot be given up, being earlier than 



pelophilus or anthracius. 



The various forms of var. fasciatus are very similar, 

 differing in the degree of darkening, and the colour of the 

 sole and sides of foot. Thus dorsalis has only the dorsal 

 region black, fasciatus proper shows distinct black bands, 



16 I have never described any such vars. as rufescens or Jlavescens of A. subfuscus, and these 

 names should certainly not appear. In a letter to Mr. Cockerell I mentioned that I purposed 

 describing such, but he pointed out that Locarcl had named a var. rufescens (sine descr.), so 

 I purposed grouping all red forms under rufofuscus, Drp.; the new var. lateritins, however, 

 turned up, and, being a much better marked one than any previously described, I grouped all red 

 forms under it. I was not aware of the var. succineus, Bouill., when I used the term JlaTcsccns. 

 All the yellow forms mentioned by Mr. Cockerell should be removed from the red ones. — W.E.C. 



" ; In all probability Muller's A. fuscus is A. sulfuscus, Drp. Signor Pollonera has very 

 kindly favoured me with examples, and I agree with him that there is practically no difference in 

 the anatomy from Lraparnaud's species. There is, however, a doubt about Muller's species, and 

 so 1 haparnaud's name should, in my opinion, be retained. A. citriuus. Wst., is probably the 

 same thing. — W. E. C 



17 The next step will probably lie to separate species according to whether they are found 

 on the north or the south side of the hedge ! — W. E. C. 



