534 Transactions of the Sociei//. 



sack of one there is a distinct tube ending in a spiral, which for 

 me is nothing more or less than a virga ; my second specimen is 

 too darkly stained to show much detail, but there protrudes from 

 the end of the preputial sack the long, slender apex of the same 

 tube, and I can just detect a loop, which must be part of the same 

 tiling. Indeed, Zacher himself figures a long protruding thread, 

 which can but be the same part. 



The genitalia show a remarkable resemblance to those of 

 Labidurodes, but the structure of the sternal plates is different. 



We may leave this genus as good, at least for the present 

 (PI. X, fig. 7). 



Genus Anisolabis Fieber. 



This unwieldy genus must be restricted to those species which 

 most nearly approach the type A. 'maritima Bon. My chief 

 difficulty in doing this is that I can see a distinct virga in several 

 species which are otherwise very close to A. maritima, and this 

 seems a very important feature. Zacher, indeed, employed it to 

 divide the Psalidse into two main groups, those with, and those 

 without, a virga, but this cannot hold good ; he makes no mention 

 of any virga in A. verhocfii, which he figures and describes himself, 

 yet I found the virga quite distinct in some of his original speci- 

 mens, to which I had access. This suggests that the virga is in 

 an unstable condition in this . group, and may possibly be present 

 in some individuals and absent in others of the same species. 



I use^the presence of the virga to subdivide the now restricted 

 genus into two groups, as I do not want to make new genera 

 unless I feel obliged. The chief feature of Anisolabis, as restricted, 

 is the elongate, almost parallel-sided, apically rounded metapara- 

 meres. All members are totally apterous, and inhabitants of the 

 Old World. 



The few species which I retain in the genus can be easily 

 distinguished as follows : — 



1. Virga present. 



2. Metaparameres decidedly narrowed at the 



tips (New Zealand species) . . .1. IAttorea White. 

 2, 2. Metaparameres not narrowed at the tips. 

 3. Metaparameres very narrow, straight ; 



very small; (Papuan species) . 2. Verhoeffi Zacher. 



3, 3. Metaparameres gently sinuate, not 

 very narrow ; medium-sized ; (West 

 African species) . . . .3. Pag ana sp. n. 



i -, ,,• , , , , , , 14. Maritima Bon. 



1,1. Virga absent; (metaparameres not narrowed at L Mauritanica Luc. 



tlps) * • ' (6. Kndaga- Burr. 



The last three can be separated by external characters, as indi- 

 cated in other works. The metaparameres are straight, very gently 

 widened about the middle, and gently narrowed at the tips, in 



