422 MB. H. R. HOGG ON AUSTRALASIAN SPIDERS. [DeC. 2, 



its eyes as well as in the form of the male palp and epigyne 

 of the female, has almost every intermediate gradation between 

 a modeiutely curved and quite flat cephalothorax. The two 

 undoubted species of Holconia Thor., H. immanis and II. insignis, 

 differ from Isopeda solely in being the extreme representatives 

 of the series in flatness of the cephalothorax, while in structural 

 features they are otherwise undistinguishable. In the only 

 specimens I can find to attribute to L. Koch's II. dolosa, the 

 cephalothorax is not even noticeably flat, and a northern species, 

 II. suhdola Thorell, is only very doubtfully attributed by him 

 thereto. I have therefore amalgamated the genus with Isopeda 

 L. K. 



In all the genera except Pediana the median eye-area is at 

 least not longer than broad, generally distinctly broader, but in 

 the latter it is longer than broad. For this reason, although the 

 rear row of eyes is clearly procurved, it has been included by 

 M. Simon among the Heteropodece. Isopeda horni mihi belongs 

 to this genus, and two new species from Western Australia biding 

 the number of its members to four, I have not been able to 

 obtain a male of any of my species ; but the epigyne of the female 

 is so distinctly of the Isopeda type, that it appears more probable 

 than not that all the males will prove to be provided with a spiral 

 flagellum and drum, and this is the case in P. regina, the type 

 species, as described by Thorell. The first and second pairs of 

 legs are nearly equal in length, and in the larger species are 

 barely Laterigrade in mode of setting. The eye-space is raised 

 up all round, and, although worthy of a distinctive genus, where 

 it diverges from Isopeda it does so almost more in the direction 

 of Mithurga Thor. than towards Heteropoda Latr. 



Its beard alone could hardly, I think, entitle Typostola E. Sim. 

 to rank as a separate genus, but the shortness of the palpal spiral 

 distinguishes it from all the species of Isopeda., where the number 

 of turns is generally about ten, but here only three. 



A primitive Delena from King's Island (Bass's Straits), in 

 which the spiral is quite rudimentary, both stylus and con- 

 ductor making only a single turn, and the tibial apophysis is 

 single instead of double, also necessitates a new genus. Except 

 in its smaller size, it is otherwise scai-cely distinguishable from 

 Delena cancerides Walck., and clearly suggests the direction along 

 which the present modification has been derived. 



The genera may be separated as follows : — 



A. The middle eyes of the front row much nearer to 

 one another than to the side-e.yes, and clearly 

 larger than the latter. Cephalothorax very flat 

 and low. Pars cephalica divided fi-om the tho- 

 racic part by deep impressions, forming an acute 

 angle. 

 ci^. Spiral of male palp having about ten convo- 

 lutions. A double apophysis on anterior end 



of tibial joint DeZejia Walck. (7) 



a-. Spiral of male palp with only one convolution. 

 Apophysis at anterior end of tibial joint single 

 only JEodelena, nov. gen. (6) 



