GENERAL CLASSIFIC^ATIOX AND STRUCTl JIE. 



Tlio following tabular exhibit is given of this classification, or group- 

 ing, if that word seems to any one more suitable: — 



Class Arachnida. 



Order Arane;k. 



I. l^irst Division. — Sedeiilarv Spiders. 



Tribe 1. Orbitelarite,^ Orbweavers. 

 " 2. Retitelarife,^ Lineweavers. 



11. Second Uivision.- 

 Tribc 5. Citigradie,^ Citigrades. 



Black- 

 "wall's 

 Classifi- 

 cation. 



Tribe 3. Tubitelarite, Tubeweavers. 

 " 4. Territelaritc, Tunnel weavers. 



Wandering Spiders. 



Tribe (3. Laterigradie, Laterigrades. 

 Tribe 7. Saltigrada', Saltigrades. 



This arrangement is the best, perhaps, tliat can be adopted, and seems 

 more natural and satisfactory than that wliicli commanded the ajiproval of 



such a distinguished arachnologist as 

 Blackwall, and which is based upon 

 the number of the eyes. Blackwall 

 founded three tribes, within whicli all 

 the species known to him are includ- 

 ed. They are: (1) Octonoculina, eyes, eight ; (2) 

 Senoculina, eyes, six ; (3) Binoculina, eyes, two. 

 In tlie first tribe, Octonoculina, whieli is the 

 most extensive of tlie three, he included all tlie 

 genera having eiglit eyes, without regard to 

 other characteristics or to the considerable dif- 

 ferences in organization and economy. The 

 second tril)e, Senoculina, as known to Black- 

 wall included but ten or eleven genera, and 

 embraced all tribes having six eyes, with the same disregard to other char- 

 acteristics. The third tribe, Binoculina, contained the single genus Nops, 

 instituted by Mr. W. S. McLeay for the reception of two remarkaljle species 

 of extra European spiders.* The Latreillian classification, which Thorell 



^ Araneie Orbitelariip: Perty, Delect. Aniin. .\rt. Bras., pajro 19:^. 



^ From retus, a net. Tlio word "net" very well exjjresses the knotteil and iiu'slird char- 

 acter of most si)iiiiuii<>:work of this ^roup. But since it is used popularly as a general tenn 

 for the \ve1)s of all spiders, I have preferred "Lineweavers" to "Netweavers" as a dis- 

 tinctive popular name of liiis tri])e. 



M'rof. Thorell assijrns the Laterij,'rades to the liftii tril)e, the C'itij^rades to the si.xth. I 

 liave ventured to so far chanjje this arran<,'enient as to rever.se the positions of the Lateri- 

 •rrades ami ('itimadcs. The ( 'itiixrailes a|i]iear to me to approach tlie Tunnehvea vers and 

 TulH'weavers, Itoth in structure ami economy, more nearly than the l>ateriirrad«'S. So also 

 the step from the ("iti<,'rades to the Laterigrades throu^^h the <ri'uus Dolomedes appears more 

 natural than the reverse, as Thorell has it ; and the stej) to the Saltijrrades from the Lateri- 

 grades is quite as, if not moi-e, natural than (Voni the Citifjrrades. l''rom the standpoint of 

 economy alone the i>assa,Lre is certainly easit-r. 



' lUackwall. Spiders of (ireat Hritain and Ireland," Preface, jia^'e <>. 



Fig. 3. Laterigrade Spider, Misume 

 na rosea Keyserling. 



