178 



mary division of Arachnida by the mode in which their mandibles are 

 articulated and move ; and those of Dufour, founded on the number of 

 branchial sacs ; points out the insufficiency of these characters, and 

 proposes a division founded on the number of eyes, as under. 



1. OCTONOCULINA. Eyes eight. 



2. Senoculina. Eyes six. 



3. BiNOCULiNA. Eyes two. 



The first and second groups are sufficiently extensive ; the third is 

 confined to the genus Nops, lately characterised by Mr. William Mac- 

 Leay, in the 'Annals of Natural History.' The species described are 

 as under. 



1. Cliihiona hrevipes. Cephalothorax glossy dark brown, the an- 

 terior and marginal portions still darker : mandibles powerful, conical, 

 internally armed with a few teeth, nearly black : legs short, dull yel- 

 low, fourth pair longest, then the second, first and third : abdomen 

 oviform, hairy, dark reddish brown. This species is ^ inch long: it 

 usually occupies an oval cell of compact white silk, which it sj)ins on 

 the inferior surface of leaves and liverworts growing on trees in the 

 wooded districts of Caernarvonshire. It leaps with agility. (Id. 603). 



2. Cluhiona fucata. Cephalothorax glossy reddish brown anteri- 

 orly, posteriorly and on the sides greenish brown, with a fine dark 

 brown marginal line : mandibles powerM and conical : legs yellow- 

 brown, fourth pair the longest, the rest of nearly equal length : abdo- 

 men oviform, hairy, yellowish brown, with a dark reddish band above, 

 extending nearly half its length from the anterior part along the mid- 

 dle ; the interval between the posterior extremity of the band and the 

 spinners, is occupied by a series of triangular spots of the same hue, 

 on each side of the medial line is an irregular, interrupted, longitudi- 

 nal band of a dark reddish brown colour. The length of this species 

 is i4 of an inch ; it conceals itself amongst foliage in the woods of 

 Denbighshire and Caernai-vonshire. (Id. 605). 



3. Cinijio atrox. This is the Clubiona atrox of Latreille, ' Gen. 

 Crust, et Insect.' The author considers it the only known species of 

 the genus Ciniflo, of which, together with the family Ciniflonidae, he 

 has given descriptions. 



4. Ergatis heniffna, the Theridion benignum of Walckenaer, 'Hist. 

 Nat. des Aran.' 



5. Ergatis latetis, the Dictynna latens of Koch, ' Die Arachn.' 



6. Ergatis viridissima, the Drassus viridissimus of Walckenaer, 

 ' Hist. Nat. des Insect. Apt.' The name Ergates has previously been 

 assigned to an annulate genus by Audinet Scrville, and the name Die- 



