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Colour similar to 0. murarius, but paler. 



Habits : semi-rolls, and feigns death ; much more active than 0. mu- 

 rarim. 



Habitat : dryish places, as under stones, dry leaves. 



Localities : Ireland — Dublin (Wexford, E. Percival Wright, Esq.). 

 England — Epping Forest, Kent. Very common among the chalk-pits 

 at Chisselhurst ; now first recorded as British. (Three specimens ia 

 British Museum Collection undistinguished from 0. murarius.) 



Genus. — Porcellio {Latreille), 

 1. — P. Bcaher {Latreille). 



Synonyms : Oniscus asellus {Linn), 0. granulatus {Lam.). Por- 

 cellio duhius, affinis et mult. al. (H. Schceff.), P. Brandtii {M.-Ed/wards). 



Body elongate, oval, rugous. Lateral processes very salient ; ex- 

 ternal angle rounded; median process triangular ; terminal ring ending 

 in a triangular point, acuminate, deeply sulcate in the median line. 



Colour : uniform grayish-black, yeUow blotches on dark ground ; a 

 nearly uniform salmon-coloured variety also met with ; there may be 

 two species confounded. 



Habit: runs with agility; semi-rolls itself ; attacks living caterpillars. 



Habitat : moist places, everywhere there is decaying matter ; among 

 sea- weed on sea- shore along with Ligia, &c. The paler varieties are 

 found in the dryer localities. 



Distribution : apparently everywhere, and very common ; carries the 

 young all through the summer. 



2. — P. dilatatus {Brandt). 



Synonyms : P. scaler {Auct. and M.-Edw.). 



Body very broad, depressed, rough, and granular; lateral frontal 

 processes very prominent, rounded at apex, and hollowed; median 

 lobe obtusely triangular, moderate ; last ring rounded at apex, plane 

 above. Ischium very flat and broad. Much larger than P. scaher. 



Colour : a uniform slate-gray. 



Habit : crawls very slowly, semi-rolls; extremely brittle in its 

 structure, a touch causing the limbs to fall off. 



Habitat : amongst decaying grass and straw, extremely rare. 



Localities : Ireland — Dublin. Now first added to British lists. 



3. — P. pictus {Auct.). 



Synonyms : P. conspersus (?), P. serialis, P. crassicornis {H. Schceffer). 



Body as P. scaher , slightly elongated ; lateral lobes very salient, 

 curved outwards ; median lobe curvilinear, small ; body granulous, last 

 ring triangular, acute at apex, superior surface sulcatcd. 



Colour similar to P. scaher, but patches more regularly arranged ; 

 may be easily mistaken for Oniscus fossor at first glance, but is more 

 shining. 



