ANNALES, X 1,1 1 (1007). 263 



ON SOME TERRESTRIAL ISOPOD CRUSTACEA 

 NEW TO THE FAUNA OF BELGIUM 



By Richard S. BAGNALL, F. E. S., 



(Wiulaton-ou-Tyue, Co. Durliam, Engluud). 



Having had occasion to visit Belgium recently on business matters 

 I was very fortunate and pleased to make the acquaintance of 

 Dr. Schoùteden at Brussels, and under his courteous guidance I 

 was enabled to dévote a couple of hours to collecting Thysanoptera 

 and Isopoda in the hot-houses of the Brussels Botanical Gardens on 

 Friday morning the 29 th of November, 1907. I also visited the 

 Antwerp Gardens for half-an-hour before dusk the following after- 

 noon. Thirleen species of woodlice were taken, and as five of thèse 

 were previously unknown to the Belgian Fauna they deserve, 1 

 think, more than passing notice; hence the reason of this short 

 paper. The species now recorded as Belgian are Ligia oceanica L., 

 Ligidium hypnorum Cuvier, Haplophthalmus Mengii Zaddach, 

 H. danicus B.-Lund, Trichoniseus pmillus Brandt, T. roseus 

 Koch, T. pygmœus G. 0. Sars, Philoscia mus cor um Scop., Onis- 

 eus asellus L., Platyarthrus Ho/fmannseggiï Brandt, Metoponortkus 

 pruinosus Brandt, Porcellio Rathhei Brandt, P. dilatatus Brandt, 

 P. pictus* Brandt, P. scaber L., P. lœois Latr., Cylisticus con- 

 vexus Hartmann, Armcidillidium vulgare Latr., A. nasatum 

 B.-Lund, A. pictum Brandt, A. pulckellum Zencker and A. sul- 

 catum M. -Edwards. 



TRICHONISCID^E. 



I. — Genus TRICHONISCUS Brandi. 



The species of this genus are as a rule found in colonies and if 

 spécial attention were paid to Ihe Trichoniscidœ noany interçsting 

 species would certainly be found in Belgium. T. Stebbingi Patibhcs 

 and T. spinosus Patishcc bave been described this year (1907) by 



