602 ivar:trâgardh 



tion as to whether. B's gênera are quite natural or not, and, 

 the former being the case, how a new genus ought to be estab- 

 lished for the présent species. I deem it more appropriate to 

 refer it provisionally to Urodi scella Berl., with which it agrées 

 in some essential features, such as the présence of so-called 

 perigenital shield and distinct metapodal shields. 



Urodiscella advena nov. spec. 



(Fig. 133-140). 



Département de VAriège [France). — Grotte de la Garosse, 

 commune de La Bastide-de-Sérou, canton de La Bastide-de- 

 Sérou, 18 bh July 1906 ; N» 154, 1 ç. 



DiAGNOSIS. 



Dorsal side covered by a central and two marginal 

 shields which do not extend to the posterior margin of the body. 

 Marginal shield areolated. Central shield with transverse 

 line near posterior edge ; hypostomatic hairs not branched. Tri- 

 tosternum tripartite. Sternal shield distinctly demarcated 

 from endopodal shields, convex anteriorly, not extending 

 to posterior margin of epigynial shield. Epigynial shield 

 tapering forwards from near its base, rounded, at the top. 

 Ventral and anal shields fused ; metapodal shields 

 distinctly demarcated. Tarsi I with one very long hair, and 

 pedmiculate, greatly reduced ambulacres. 



Description. 



Length : 850 y.. Width : 650 a. 



Shape oval, anteriorly pointed, posteriorly rounded, and 

 with the sides parallel for some distance, in the middle. 



Dorsal side (fig. 133) of the shape typical of Discopoina 

 Can., viz., with a largo central shield which does not extend 

 to tlio posterior margin of the body, and which is • anteriorly 

 fused with the marginal shields, but otherwise distinctly 

 demarcated from them. Marginal shields scarcely extending 



