450 Mv. J. Blackwall on the Structure, Functions, (Eeonomij, 



■ 35. Thomisus formostts. 

 Thomisus formosus, Blackw. Annals and Mag. of Nat. Hist. Second 

 Series, vol. yi. p. 337. 

 An adult male and female of this handsome species, captured 

 at Southgate in 1848,. the former in May and the latter in June, 

 are in Mr. Walker's cabinet. 



36. Thomisus luctuosus. 



Thomisus luctuosus, Blackw. Lond. and Edinb. Phil. Mag. Third 

 Series, vol. viii. p. 489. 



Thomisus luctuosus is found among coarse herbage growing in 

 woods and pastures about Oakland. In July the female con- 

 structs a lenticular cocoon of white silk of a compact texture 

 measuring ^jth of an inch in diameter, and deposits in it between 

 80 and 90 spherical eggs of a pale yellowish white colour, not 

 agglutinated together. The cocoon, to which the female mani- 

 fests her attachment by remaining constantly with it, is often 

 placed between two leaves connected by a slight tissue of silk, 

 forming a kind of sac. 



This spider appears to be nearly alhed to the Thomisus fucatus 

 of M. Walckenaer (Hist. Nat. des Insect. Apt. t. i. p. 505). 



37. Thomisus bifasciatus, 



Thomisus bifasciatus, Blackw. Linn. Trans, vol. xix. p. 122. 

 Xysticus bifasciatus, Koch, Die Arachn. B. iv. p. 59. tab. 125. fig, 

 286-288 ; Uebers. des Arachn. Syst. erstes Heft, p. 26. 



In spring this species may be observed running on the ground 

 in pastures near Llanrwst. The female constructs a lenticular 

 cocoon of white silk of a compact texture, measuring |ths of an 

 inch in diameter, on the inferior surface of the leaves of plants, 

 the edges of which are folded upon it and retained in that posi- 

 tion by silken lines; it comprises about 185 spherical eggs of a 

 yellowish white colour, not agglutinated together, which are 

 hatched in July. 



An adult female, taken in May 1846, had the right eye of the 

 posterior row very much smaller than the left eye of the same 



row. 



38. Thomisus pallidus. 



Thomisus pallidus, Blackw.Ann. and Mag. Nat. Hist, vol.xviii. p. 299. 



I discovered this spider among grass in a pasture at Oakland 

 in September 1845, and in April 1849 I received from James 

 Hardy, Esq., of Penmanshiel, Berwickshire, an adult female, 

 found under a stone in Penmanshiel wood. Like Thomisus cris- 

 tatus, Thomisus bifasciatus, and some other species belonging to 



