MR. J. BLA.CKWALL ON SOME TUSCAN SPIDERS. 415 



part ; the sexual organs, which are well developed, and of a red-brown 

 colour, are seated on a triangular spot, to which succeed two short, 

 irregular, parallel streaks, and there are two parallel spots at the base 

 of the inferior pair of spinners ; the colour of these spots and streaks 

 is yellowish-white. 

 The male is darker-coloured and less distinctly marked than 

 the female. Its palpi are short, and of a dark-brown colour, with 

 the exception of the cubital joint and the extremity of the 

 humerus, which have a red-brown hue; the radial joint is 

 supplied with long hairs, and has a pointed apophysis at its ex- 

 tremity, on the outer side ; the digital joint is rather long, convex 

 and liairy externally, concave within, comprising the palpal 

 organs, which are highly developed, not complex in structure, 

 very prominent at the base, with a strong curved spine on the 

 inner side, which extends to their extremity, and are of a dark- 

 brown colour tinged with red. 



Salticus nitens. 



Ileliophanus nitens, Koch, Arachn. Band xiv. p. 63, t. 477- f. 1319. 



Salticus mutilloides, Lucas, Exploration de VAlgerie, Hist. Nat. 

 des Animaux urlicules, Arachnides, p. 185, pi. 10. f. 7. 



Eamily TIIOMISIDyE. 



Genus TiioMisus, Walch. 

 Thomisus rotundatus, Walck. Hist. Nat. des Insect. Apt. torn. i. 



p. 600. 

 Thomisus globosus, Hahn, Arachn. Band i. p. 34, t. 9. f. 28. 



TiioMisus AUDAX, Blackw. Spiders of Great Britain and Ireland, p. 70, 



pi. 4. f. 39. 

 Xysticus audax, Koch, Arachn. Band xii. p. 74, t. 413. f. 1005-1008. 



Thomisus citreus, Walck. Hist. Nat. des Insect. Apt. torn. i. p. 526; 



Latr. Gen. Crust, et Insect, torn. i. p. Ill ; Hahn, Arachn. Band i. 



p. 42, t. 2. f. 32; Sund. Vet. Akad. Handl. 1832, p. 219; Blackw. 



Spiders of Great Britain and Ireland, p. 88, pi. 4. f. 53. 

 Thomisus dauci, Hahn, Arachn. Band i. p. 33, t. 9. f. 27- 

 Thomisus calycinus, Koch, Arachn. Band iv. p. 53, t. 124. f. 283, 284. 



Thomisus amcenus, n. sp. PI. XVI. fig. 7- 



Length of the female -/V in- ; length of the cephalothorax Vo. breadth -^; 



breadth of the abdomen | ; length of an anterior leg ^^ ; length of a 



leg of the third pair \. 

 The eyes are disposed on the anterior part of the cephalothorax in the 



