ANNALES, XLII (l907). 265 



II. — Genus HAFIMIUITIIàLMUS Sciiohl. 



There are Iwo European species of lliis inteœsling genus l)olli of 

 whicli 1 liave pleasure in recording helow tVom Belgium. 



1. — Haplophthalmus Mengii Zaddoch. 



Jtca Meuffii Zkddoch, ^yn. Crust. Prussicorum prodromus Ref/iomotiti, p. IH, 

 1844 : Haplophthahnus elegans Schobl, Sitz. der math, naturw. Acad. Wiss. 

 WiEN, XL (1860), p. 449 : Haplophthalmus Mengii Buddk-Lum), Crnstacea 

 Isopoda Terrcstria, p. 250, 1885; G. 0. Sars, Crustacea ofNorway, II, p. 167, 

 pi. LXXIV, fig. 1, 1898; Webh and Sillem, British Wondlice, p. 26, 

 pi. YII, 1906. 



I liave taken this rare and very distinct species in many Britisli 

 localities and at Grùne near Letmatlie (Westphalia), Germany. 



Belgium. — A single example witli Trichoniscus pygmœus at 

 Antwerp, Noveniber, 1907. 



2. — Haplophthalmus danicus Budde-Lund 



Haplophthalmus elegans Budde-Lund (not Sghôbl), Natukhistorisk Tidsskrift, 

 pt. 3, VII, p. 228, 1870 : Haplophthalmus danicus Budde-Lund, Crustacea 

 Isopoda Terrcstria, p. 9, 1879 : Haplophthalmus Mengii Weber (not ZADr 

 DOCHJ, TijDSCHR. DER Nederlandsche Dierk. Yereen.,- V, p. 192, pi. V, 

 figs. 7-9, 18 : Haplophthahnus danicus G. 0. Sars, Crustacea of Norway, II, 

 p. 168, pi. LXXIV, fig. 2, 1898; Wemb and Sillem, British Woodlice, p. 27, 

 pi. VIII, 1906. 



AIso of wide European distribution and oflen found in niimbers. 

 Thèse two forms are much slower in their movements tlian most 

 species of Trichoniscus , and owing to ils coloration (in a sensé pro- 

 tective) in conjunction with itssluggisli movements H. MengiiZxDi)., 

 is really very diffîcult to detect. H. danicus is often found frequent- 

 ing moderately cool greenhouses and I bave recenlly discovered 

 living wilb it a long, linear, slow-moving species of Trichoniscus 

 whicb curiously simulâtes this species (^j. 



Belgium. — A single example amongst moist earth at root of 

 tree, Botanical Gardens, Brussels, November, 1907. 



(') This is tlie Trichoniscus linearis, sp. nov., shortly to be described by 

 Patience. 



