86 



lotlwrax and legs of a uniform yellowish white (in the pars cepha- 

 lica is much darker) , whereas the spider here described by Westring , 

 or Th. Ohlertii, as I propose to call it, is about as large as Th. 

 varians or Hi. tinctum, and has a dark longitudinal central line and 

 dark borders on the ceplialothorax , and legs with distinct brown rings. 

 Hi. Heloiso? [-ii] Walck. 1 ), which Westring suspects to be synonymous, 

 is probably also a separate species. — The sternum is yellowish, with 

 a dark margin. The abdomen is white or greyish above, with dark re- 

 ticulation, and with a narrow dark central band in front, which how- 

 ever is sometimes represented by a narrow ^-formed spot at the base 

 of the abdomen; in the midst of the back may be observed 4 small 

 white points, forming a trapezium narrower behind than in front, 

 but of which points the 2 anterior are not always distinct. Imme- 

 diately behind the posterior points, there is a dark, narrow, some- 

 what backward-curved transversal band, and a whitish, deeply in- 

 dented band, gradually diminishing in breadth backwards, extends 

 from that to the anus. In the incisions of this band, on both sides, 

 a pair of short, obliquely placed dark spots are seen. Sometimes 

 the whole design is indistinct and is represented only by the ^-formed 

 spot. The belly exhibits 4 small white spots round the spinners, 

 sometimes alternating with 6 black ones. The middle of the belly 

 is usually occupied by a large semicircular area, somewhat lighter 

 than the grey-white sides. The vulva is large and brownish. — 

 Prof. Stal kindly sent me the typical specimens of Westring's de- 

 scription. 



Of the real Th. minimum Keuss 1834 or Th. pollens Blackw. 

 1834 — the latter name ought to be preferred as being more cer- 

 tain — , Cambridge has obligingly sent me specimens of both sexes. 

 That species belongs also to the fauna of Sweden: I captured seve- 

 ral years ago a fullgrown male of it at Upsala. 



(Pag. 171.) 12. Th. Sisyphium [= Theritlium sisyphium (Clerck) 



1757]. 



Syn.: 1757. ARANEUS SISYPHUS Clerck. Sv. Spindl., p. 54, PI. 3, tab. 5. 

 1758. Aranea notata Linn., Syst. Nat., Ed. 10, I, p. 621. 

 1789. „ nervosa Oliv,, Encycl. Meth., IV, p. 210. 

 1803. „ scopulorum Schrank, Fauna Boica, III, 1, p. 241. 

 1805. THERIDIUM NERVOSUM Walck., Tabl. d. Aran., p. 74. 



1) Hist. Nat. d. Ins. Apt., II, p. 317. 



