274 On the Systematic Arrangement of British Spiders. 



164. Walckenaera punctata. 



Walckenaera punctata, Blackw. Linn. Trans, vol. xviii. p. 629. 

 Argus trapezo'ides, Walck. Hist. Nat. des Insect. Apt. t. iv. p. 503. 



M. Walckenaer, in disposing of Walckenaera punctata as a 

 synonym of Argus trapezo'ides, refers to his ' Hist. Nat. des In- 

 sect. Apt/ t. ii. p. 353 for an account of the latter ; but as no 

 species bearing that name is included in the volume, I am unable 

 to dispel the obscurity in which the subject is involved. 



Females of this spider were taken in May 1838 under stones 

 in a moist pasture near Llanrwst. 



165. Walckenaera obscura. 



Walckenaera obscura, Blackw. Research, in Zool. p. 321. 



Several males of this species, having the palpal organs fully 

 developed, were obtained on iron rails at Crumpsall Hall in 

 April 1834, and on plants growing in the woods at Oakland 

 early in June 1835. 



166. Walckenaera flavipes. 



Walckenaera flavipes, Blackw. Research, in Zool. p. 322. 



In May 1834 I captured an adult male Walckenaera flavipes 

 under the exfoliating bark of a sycamore at Crumpsall Hall, and 

 in the spring of 1840 I met with both sexes under stones im- 

 bedded in the earth in a pasture at Oakland. 



167. Walckenaera turgida. 

 Walckenaera turgida, Blackw. Linn. Trans, vol. xviii. p. 630. 



Specimens of this spider were discovered in the autumn of 1836 

 under stones and blocks of wood in the plantations at Crumpsall 

 Hall. 



A suspicion is expressed by M. Walckenaer that Walckenaera 

 turgida may be identical with Argus parallelus (Hist. Nat. des 

 Insect. Apt. t. iv. p. 508) ; but the males of these species exhibit 

 differences in the form of the anterior part of the cephalo-thorax 

 and in the disposition of the eyes. 



168. Walckenaera atra. 



Walckenaera atra, Blackw. Linn. Trans, vol. xviii. p. 631. 

 Argus ater, Walck. Hist. Nat. des Insect. Apt. t. iv. p. 508. 



Both sexes of Walckenaera atra, the males having the palpal 

 organs in a perfect state of development, were found in May 1838 

 under stones in a moist pasture near Llanrwst. 



In the ' Transactions of the Linnaean Society/ vol. xviii. p. 632, 



