130 MODERN SYSTEM, 



Aranea scenica. Linn., Fabr. Atte pare. Walck. Salticus sccnicus. 



Latr., Lenc/i. 

 Inhahits walls and palings. It is founil in most parts of Europe, and is 



called in Britain the Hunting Spider. 



Genus 23. ATTUS. Wnlck., Lcadt's Supp. to Encycl. BriU Sal- 

 ticus. Latr., Leach's Edln. Encycl. vol. vii. 



Maxilla- straight, longitudinal, subrliomboidal or inversely cuneate- 

 ovate: ///> elongate, suboval, with the apex obtuse: ;j«//)i filiform : 

 thorax elongate, narrow, subconic : ci/es disposed in the form of a 

 horse-shoe; the two middle eyes largest: lega slender, elongate, the 

 first pair thickest and not longer than the fourth pair; the second 

 and tliird pairs of nearly an equal length and shorter than the other 

 pairs. 



Sj). 1. Att. fortnicarim. Thorax anteriorly black, behind red : abdomen 

 fuscous, with a white spot on each side: legs red. 



Attus formicarius. Walck. Salticus formicarius. Latr., Leach. Arai- 

 gnee fourmi. De Gcer. 



Inhabits Eurojic, residing on pMits and walls. It is very rare in Scot- 

 land, and has not been observed in England. 



Class IV. A CAUL Leach's MSS. 



In the Supplement to Encycl. Brit. vol. i. the animals of this Class 

 were arranged with the Arachnoida and formed the Order Monomero- 

 somata. Since that paper was written, Dr. Leach has, from a further 

 investigation of their characters, separated them from the Arachnoida 

 (in which they differ essentially), and considers them as a distinct 

 class ; they are for the most part parasitic, living on the bodies ol" 

 otlier animals: to the lovers of the microscope these animals will af- 

 ford an extensive field for their research and investigation ; they are 

 very numerous, highly interesting, and as yet but in)perfectly known. 



CiiAUACTER. — Body formed but of one segment: mouth rostriforni, 

 or in some fm-nishcd with maxillcE and mandibles: legs six or eight : 

 irachem for respiration. 



Section I. — Legs formed for zcalking. 

 A. Mouth 7vith mandibles. 

 Fam. I. Tkombidiads:. Leach. 



Talpi porrect, and furnished at their extremities M'ith a moveable ap- 

 pendage. F.ycs two, placed on a pillar. Body apparently divided 

 into two parts by a transverse line; the anterior division bearing the- 

 eyes, mouth, and four anterior legs. 



