uniting the Genera Gonyleptes and Phalangium. 399 
Corpus flavum, marginatum, margine exteriore elevato, interiore tuber- 
culis luteis regulari serie ornato; subtüs concolor. Discus medio con- 
vexus, tuberculis luteis numerosis aspersus. Abdomen brevissimum, libe- 
rum. Pedes octo inzquales; postici longissimi, geniculis crassioribus, 
apicibusque femorum tibiarumque obscurioribus. 
Habitat in Brasilià. In mus. Dom. Hope. 
This Arachnide was one of the principal new forms contained in the collec- 
tion of the late Adrian Hardy Haworth, Esq., a zealous promoter of ento- 
mology in all its branches, in respect to whose memory I have dedicated the 
Species. ; 
In Mammalia, when we find the thighs strong and incrassated, we natu- 
rally expect a leaping animal, as in the Kangaroo, Jerboa, and many of the 
Rodentia; so also amongst insects in the genera Bruchus, Orchestes and Hal- 
tica. Where the tibiæ are much developed, we have reason to expect swift- 
ness in running, as in the Deer and Antelopes, and in the Cicindelidæ, and par- 
ticularly in Cicindela tenuipes. In the present instance, however, we have no 
reason to expect great swiftness, as the hinder legs are disproportionately long, 
sufficient, indeed, to counteract that power, For what purpose, then, are the 
entire hind legs so much increased? I own I am at a loss to conjecture: it 
is possible, perhaps, that they may be prehensile organs of attachment while 
the animal attacks its prey with the fore legs. I mention this solely with the 
view of drawing attention to the subject. 
EXPLANATION OF TAB. XVI. 
Fig. 1. Dolichoscelis Haworthii, natural size. 
2. Anterior cephalothoracic spines, with an eye at the base of each. 
3. One of the anterior chelæ. 
4. Underside of the body, with the base of the legs on one side. 
5. Extremity of the hind leg. 
