GENERAL CLASSIFICATION AND STRUCTURE. alr 
The following tabular exhibit is given of this classification, or group- 
ing, if that word seems to any one more suitable :— 
Crass ARACHNIDA. 
OrpEer ARANEA. 
I. First Division —Sedentary Spiders. 
Tribe 1. Orbitelariz,! Orbweavers. Tribe 3. Tubitelarie, Tubeweavers. 
“ 2. Retitelariz,? Lineweavers. “ 4. Territelarie, Tunnelweavers. 
II. Second Division.—Wandering Spiders. 
Tribe 5, Citigrade,*® Citigrades. Tribe 6. Laterigrade, Laterigrades. 
Tribe 7. Saltigrade, Saltigrades. 
This arrangement is the best, perhaps, that can be adopted, and seems - 
more natural and satisfactory than that which commanded the approyal of 
such a distinguished arachnologist as 
Black- = Blackwall, and which is based upon 
et the number of the eyes. Blackwall 
cation, founded three tribes, within which all 
the species known to him are includ- 
ed. They are: (1) Octonoculina, eyes, eight; (2) 
Senoculina, eyes, six; (3) Binoculina, eyes, two. 
In the first tribe, Octonoculina, which is the 
most extensive of the three, he included all the 
genera having eight eyes, without regard to 
other characteristics or to the considerable dif- 
ferences in organization and economy. The 
Fia.3, Laterigrade Spider, Misume- Second tribe, Senoculina, as known to Black- 
na rosea, Keyserling. 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. 8. McLeay for the reception of two remarkable species 
of extra European spiders.4 The Latreillian classification, which Thorell 
1 Aranew Orbitelariz: Perty, Delect. Anim. Art. Bras., page 193. 
2 From retus, a net. The word “net” very well expresses the knotted and meshed char- 
acter of most spinningwork of this group. But since it is used popularly as a general term 
for the webs of all spiders, I have preferred “Lineweavers” to “Netweavers” as a dis- 
tinctive popular name of this tribe. 
_* Prof. Thorell assigns the Laterigrades to the fifth tribe, the Citigrades to the sixth. I 
have ventured to so far change this arrangement as to reverse the positions of the Lateri- 
grades and Citigrades. The Citigrades appear to me to approach the Tunnelweavers and 
Tubeweavers, both in structure and economy, more nearly than the Laterigrades. So also 
the step from the Citigrades to the Laterigrades through the genus Dolomedes appears more 
natural than the reverse, as Thorell has it; and the step to the Saltigrades from the Lateri- 
erades is quite as, if not more, natural than from the Citigrades. From the standpoint of 
economy alone the passage is certainly easier. 
4 Blackwall, “Spiders of Great Britain and Treland,” Preface, page 6. 
