COCKERKLL AND COLLINGE : CHECK-LIST OF SLUGS. 35 



367 t. rupicola. Pollonera cites this as a doubtful species; it has 

 been thought to be a form of A. rufiis. 



Very Hkely both this and bicolor, Broeck, really belong not 

 to A. ruftis but A. siibfusats, especially as Pollonera says he 

 had some young sub fti sens {xovc\ France agreeing \s\X}i\ bicolor. 



371. siilcatiis. I give this sub-specific value, as it differs somewhat 



from rii/us of Central Europe. Simroth's enipiricorum var. 

 bocagei should probably be placed under sukatiis, in which 

 case the bocagei-X^^ forms {niHlIeri, &c.) of rufns must be 

 separated from it. The question is whether we are to 

 regard the name bocagei as applying merely to the peculiar 

 colour of that slug, or to colour plus such slight structural 

 differences as pertain to the Portugese race. So far as 

 observed the pale-backed forms of sidcahis {bocagei) and 

 rufus {mulleri, &c.) are not strictly identical, as may very 

 well be seen by comparing the figures of Simroth and 

 Scharff; and it seems very possible that ru/us proper does 

 not produce a colour-variety exactly like bocagei, nor siiLatns 

 one like tmilleri. 



1 have examined several examples of sulcatus in the 

 British Museum, which were obtained by Mr. E. A. Allen. 

 They are dark brown in colour. 



372. fuligineus. If it could be proved that this was lusitanicus, of 



course it has priority. Pollonera suggests its affinity with 

 suhiuscus — but that species appears not to be found in 

 Portugal. Simroth thinks it may be an immature form of 

 lusitanicus, or a closely allied species. 

 372 I?. simrotJii. A small race from the Azores, which should 

 probably be regarded as a sub-species. See Simroth, 

 Archil', f. iVat., 1888, p. 227, and Fort. Azor. Faun., 

 Taf. 4., figs. 12-13. 

 375. mbrei. Five specimens from Portugal in the British Museum 

 (E. A. Allen) appear to belong to nobrei, but they vary 

 among themselves. One seems like sulcatus, only black 

 with a plumbeus sole ; the other four have the rugc'e divided 

 more transversely, after the manner of atcr. The exact 

 particulars are as follows : — 



1. Black, mouth pale, sole plumbeus, unicolorous, 



length 6\^ mm. 



2. Black, mouth pale, sole plumbeus, unicolorous, 



length 6ih mm. 



3. Black, mouth hardly pale, sole olivaceous, length 



51 mm. 



