130 



Numbers at least of a periodical do not usually appear till the year 

 after the date which the periodical hears. Koch's specific name 

 appears to me moreover preferable to Blackwall's in that his first 

 description was accompanied by figures, which was not the case with 

 Blackwall's, and it is also more generally known than the latter. 



(Pag. 276.) 38. E. roblista f= Er iff one robust a Westr. 1851 



+ Erigone rufa (Keuss) 1834]. 



? [= E. robusta Westr.]: 

 Syn.: 1851. Erigone robusta Westr., Forteckn. etc., p. 43. 



3 [= E. rufa (Keuss)]: 

 Syn.: Vid. infra p. 132 sub E. erythrocephala Westr. 



Of the female here described by Westring, on which this spe- 

 cies was in 1851 founded, and which therefore is the type of the 

 species, I have a specimen determined by Westring himself, which 

 Prof. Th. Fries captured in the isle of Maasoe in the Norse Finn- 

 mark and kindly presented to me. From $ of E. rufa or erythro- 

 cephala Westr. it is without difficulty distinguished by the two last 

 joints of the palpi not being thicker than the patellar joint, and 

 nowhere thicker than the basis of the metatarsi of the l:st pair. 

 The length of the tibial joint is about three times its breadth, not 

 only double. The anterior row of eyes seems to me somewhat curved 

 backwards, not quite straight. The distance between the anterior 

 central eyes and the border of the clypeus is hardly so great as the 

 length of the area of the 4 central eyes. The vulva consists of a 

 large, reddish brown, almost semicircular, somewhat convex, shining 

 lamina. — The male is as yet unknown: that which Westring in 

 Aran. Svec. refers, with a note of interrogation, to this species, does 

 not belong to it, but to E. rufa (Beuss) or E. erythrocephala Westr., 

 whereof more hereafter. 



Westring has lately sent me a cf captured in Ostergotland by 

 Lieutenant H. von Post, which he now suspects, though certainly 

 erroneously, to be the d 1 to E. robusta. In size, colour, form and 

 position of the eyes, etc., this male is very like E. rufa or erythro- 

 cephala cf, but it is easily distinguished from it by the palpi etc. 

 The clypeus is low, not fully so high as the length of the line occu- 

 pied by 3 eyes in the anterior row. The mandibles are slender, 

 not thicker than the anterior thighs, with the fore-side almost 



