603 



liar family. Cambridge ') has however since informed us that CEco- 

 bius yiavus Blackw. is really an (Ecobius. In this case Blackwall's 

 description, at least as concerns the number of the eyes and tarsal 

 claws, must be faulty. Although 1 have been unable to discover an 

 inframamillary organ and calamistrum in CEc. domesticus and CEc. 

 anmdatus (I had but a single specimen of each at my disposal), it 

 is very possible that these organs, in conformity with what Black- 

 wall states about CEc. navus, may also exist in the two species 

 mentioned: Cambridge 2 ) describes a third species, CEc. trimacttlatus 

 Cambr., which has not only a calamistrum, but eight mamillae, "two 

 very short, small and supernumerary being situated in front of the 

 six ordinary ones". If by these supernumerary mamillae be meaut, 

 not an inframamillary organ, but two real mamillae, this is the first 

 example, that has come to my knowledge, of a spider with four pairs 

 of mamillae. — Simon 3 ) reckons CEcolius to the same family as Her- 

 silia and Hersiliola 4 ), which Cambridge 5 ), on grounds that appear to 

 me reasonable, considers as erroneous. — The exstinct family Mi- 

 zalioidce (vid. Thor., On Eur. Spid., p. 228) ought probably to oc- 

 cupy a place immediately beside the Urocteoidce (CEcobiides Cambk.). 



Stenochilus Cambr. 6 ) ought without a doubt to form a separate 

 family, Stenochiloidce , among the Tubitelariae, as it differs from the 

 Drassoidce not only by its narrow labium, the peculiar position of 

 its eyes etc., but also by having, like Palpi?nanus, Cryptotkele and 

 Dielacata (vid. sup., p. 543), only two mamillae. According to Cam- 

 bridge, it shows an analogy with Palpimamis also in the form of the 

 maxillae and the greater relative strength of the coxae and femora of 

 the fore legs. Equally singular is the genus Rhium [Bhiori] Cambr. 7 ), 

 for which it is without question necessary to form a separate family, 

 Rhioidce; it is chiefly distinguished by having six eyes, and three 

 tarsal claws (which appear to resemble those of the Agcdenoidce), as 

 also calamistrum and inframamillary organ. I conceive its natural 



1) Bibliogr. Not., in Aim. and Mag. of Nat. Hist., 4 Ser., VI, p. 416. 



2) Spid. of Palestine and Syria, p. 219. 



3) Aran. nouv. ou peu connus du roidi de l'Europe, p. 76. 



4) Hersiliola Thor., On Eur. Spid., p. 115, is = Hersilidia Sim. (Hersi- 

 liada Cambr.), Aran. nouv. ou peu connus etc. , p. 79. The name Hersiliola has, 

 as I am informed in a letter by Mr Simon, the priority. 



5) Spiders of Palestine and Syria, p. 221. 



6) On some new gen. and spec, of Aran. , p. 729. 



7) Ibid. , p. 740. 



