84 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



lighter than the last-named species, and it is slower in its 

 movements. I observed the young escaping from the brood- 

 pouch of the female during the months of June, July, August, 

 and September. Length of adult male, 12 mm.; female, 13 mm. 

 Occurrence. — (1) Poplar Park, Lanark; hothouses, in con- 

 siderable numbers; sparingly in grounds in neighbourhood; (2) 

 Clachranehill, Ayr; hothouses and grounds, though not in abun- 

 dance; (3) Toadhills, Kilwinning; hothouses and grounds, not 

 very common ; (4) Millbrae, Chryston ; hothouses, considerable 

 numbers; grounds, few; (5) Queen's Park Gardens and Camphill 

 Gardens, Glasgow, few. 



Genus Metoponorthus, B. Lund, 1879. 



Metoponorthus pruinosus, Brandt, may be distinguished from 

 the species of the genus Porcellio by the almost straight frontal 

 margin, the slight development of the lateral lobes of the cephalon, 

 and the narrow metasome. The antenna? are long and slender, 

 and are banded with white. The colour of the dorsal face is dark 

 reddish brown, but when the animal is alive and moving about it 

 exhibits a uniform violet grey, which gives to the animal a rather 

 striking and beautiful appearance. This is due to a substance 

 which easily comes off when the animal is handled. It is one 

 of the most agile of the wood-lice. Length of adult male, 

 9 mm. ; of female, 10 mm. 



Occurrence. — (1) Poplar Park, Lanark ; hothouses and grounds, 

 not uncommon ; (2) Clachranehill, Ayr ; hothouses, considerable 

 numbers ; grounds, sparingly ; (3) Toadhills, Kilwinning ; grounds, 

 few; (4) Millbrae, Chryston; hothouses and grounds, few; (5) 

 Botanic Gardens and Queen's Park Conservatory, Glasgow, few. 



Notes on the other species. 



TricJioniscus pusillus, Brandt. — Common and widely distri- 

 buted; very sparingly in hothouses examined. In open situations 

 sometimes in considerable numbers. 



Principal Localities. — (1) Several places in Great Cumbrae; 

 (2) near Rothesay; (3) near Langbank; (4) near Wemyss Bay 



