114 



not inconsiderably broader than the inferior row of eyes is long (Conf. 

 Koch's figure, loc. cit. !). Viewed thus, it exhibits no longitudinal 

 depression above (sucb a depression is only indicated by a darker line): 

 Koch also says loc. cit., p. 134, that the head in his M. elevatus is 

 "not at all depressed in the middle". Westring does not appear to 

 have known this species. — In the other form, the maximum breadth 

 of the knop on the head is equal to the length of the inferior row of 

 eyes , and the knop exhibits a longitudinal depression in the middle. 

 To this form belongs a <$ specimen of E. elevata Westk. given me 

 by Westring himself: it is unquestionably identical with Blackwall's 

 Walchenaera bifrons, of which it is distinctly said that the knop on 

 the head "is divided into two lobes at the summit by a longitudinal 

 furrow", exactly as is the case with Westring's spider. — L. Koch has 

 obligingly sent me specimens of both species from the neighbour- 

 hood of Nurnberg, under the same names which I consider as those 

 properly belonging to them. 



A widely different species is Neriene elevata Cambr. , which is 

 identical with E. retusa Westr. See that species farther on. 



(Pag. 228.) 17. E. Thorellii [= Erigone Thorellii Westr. 1861]. 



Syr}.: f? 1838. MlCRYPHANTES ACUMINATUS C. Koch, Die Arachn., IV, p. 130, 



Taf. CXLm, figg. 332, 333. 

 1864. WALCKENAERA FASTIGATA Blackw., Spid. of Gr. Brit., II, p. 



314, PI. XXII, fig. 229. 



Blackwall's above cited description and figures fully agree 

 with the type-specimen of this species, an ad. cf, preserved in my 

 collection. Cambridge also, as he states in a letter, considers E. 

 Thorellii Westr. and W. fastigata Blackw. synonymous. — C. Koch 

 says of the knop on the head of his Micryphantes acuminatus that 

 "it is somewhat depressed in the middle between the posterior cen- 

 tral eyes", which is the case in the species before us, to which I 

 therefore, in conformity with Blackwall, refer it, rather than to 

 E. acuminata (Eetjss) Westr. , in which no such depression is found , 

 and under which Koch's M. acuminatus is cited by Westring and 

 Walckenaer. See more on the subject of both these species next 

 page. — Micrypliantes frontalis Ohl. (Aran. d. Prov. Preuss., p. 66) 

 appears to be a species nearly allied to E. Thorellii, but decidedly 

 not identical with it. 



