A NATURALIST ON THE PROWL. 
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6. Citigradce , wolf spiders, which hunt among grass 
and bushes. 
/. Saltigradcz , jumping spiders. 
This seemed admirable, and I went deeper into the sub- 
iect, that I might know how to identify any strange spider. 
Taking up the seventh sub-order, I found that it was 
divided into two families — the Eresoidcz , in which the 
cephalo-thorax is convex, and the Attoidcz , in which it is 
flattened. So if I get a jumping spider, I said, with its 
cephalo-thorax flattened, it shall go into the Attoidcz. But 
the Attoidcz are again divided into two groups, those which 
have the cephalic portion higher than the thoracic portion, 
and those in which it is not higher. The second of these 
is again divided into those in which the eyes are arranged 
in a quadrangle longer than it is wide, and those which 
have them arranged in a quadrangle wider than it is long. 
Two further sub-divisions follow, and then you come to the 
genera, which are distinguished in this way. Ballns , ocular 
quadrangle distinctly wider behind than in front ; Marpessa , 
ocular quadrangle scarcely wider behind than in front. 
At this point I began to understand how it is that the 
world can only support one authority at a time on such 
a subject, and for myself I decided to cultivate the 
