1872.] NEW SPECIES OF ERIGONE. 759 



nation by Dr. L. Koch, by whom it was found near Nuremberg. 

 It is remarkable from its combining the characters of the Neriene and 

 Walckenaera groups in a form and degree that I have not before 

 noticed, having the elevated caput of the latter and the eye-position 

 of the former. In this respect it groups with Neriene cornuta and 

 N. Utuberculata ; but the divided caput of these two species, as 

 well as the forms of their palpi, distinguish them at a glance. 



Erigone (Walckenaera) kochii, sp.n. (Plate LXVI. fig. 15.) 



Male adult, length \ of an inch. 



This Spider, supposed by Dr. Koch to be TV. unicornis (Cambr.), 

 is certainly very nearly allied to it, and bears great resemblance to 

 it in the peculiar character of the cephalic eminence ; but it differs 

 remarkably, both in the special form of that portion of its structure 

 and in the form and structure of the palpi and palpal organs. 

 In colour the two species are alike j but the present is rather the 

 largest ; the perpendicular eminence which issues from the middle 

 of the space occupied by the eyes is much stronger and more con- 

 spicuous than in W. unicornis, but is (as in that species also) bifid 

 or strongly notched at its extremity ; the limbs of the bifid portion, 

 however, are longer and more divergent; and consequently the 

 notch is deeper and larger ; near the base in front this projection is 

 prominent, and has some short hairs on the prominent part ; it is 

 also placed rather further back upon the caput than in TV. unicornis, 

 being closer to the eyes of the hinder than to those of the foremost 

 pair. Looked at from above, the extremity of each of the limbs of 

 the bifid part is very shining and much resembling an eye. 



The palpi differ remarkably in the structure of the radial joint 

 from those of TV. unicornis ; it is very short, and very narrow at its 

 junction with the cubital joint, whence it enlarges suddenly, and has 

 two long, strong apophyses from its extremity, a little on the inner 

 side ; the outermost of these is rather the shortest, and is bifid at 

 its extremity, one limb of the bifid part being longer than the other 

 and of a deep black-brown colour, but not so strong; the other 

 apophysis adheres more closely to the digital joint, and is pointed 

 at its extremity, and gibbous on its outer and upper edge. The 

 palpal organs are highly developed and complex, and have a black 

 filiform spine coiled round their extremity on the outer side. 



A single example of this interesting species was received for ex- 

 amination in 1868 from Dr. Koch, by whom it was found at Nurem- 

 berg, and after whom I have taken the liberty of naming it. Very 

 lately (May 1872) I have received another example of it from Warsaw, 

 where it was found by M. Taczanowski, "Conservateur" of the 

 Zoological Museum at Warsaw, by whom it has been most obli- 

 gingly submitted to my inspection, among many other rare and 

 interesting forms of this genus. 



Erigone (Walckenaera) monodon, sp. n. (Plate LXVI. 

 fig. 16.) 



Male adult, length f of a line. 



