milting the Genera Gonyleptes and Phalangium. 399 



Corpus flaviim, inarginatuni, margine exteriore elevato, interiore tuber- 

 culis liiteis regulari serie ornato ; subtiis concolor. Discus medio con- 

 vexus, tuberculis luteis numerosis aspcrsus. Abdomen brevissimum, libe- 

 runi. Pedes octo inaequales ; postici longissiini, geniculis crassioribus, 

 apicibiisque femorum tibiarumque obscurioiibus. 

 Habitat in Brasilia. 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 3Iammalla, when we find the thighs strong and incrassated, we natu- 

 rally expect a leaping animal, as in the Kangaroo, Jerboa, and many of the 

 Rodentla ; so also amongst insects in the genera Bruchus, Orchestes and Hal- 

 tica. Where the tibiae are much developed, we have reason to expect swift- 

 ness in running, as in the Deer and Antelopes, and in the Ciclndellda', and par- 

 ticularly in Clclndela tenulpes. 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 piu'pose, 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. DoUchoscetls Haworthll, natural size. 



2. Anterior cephalothoracic spines, with an eye at the base of each. 



3. One of the anterior chelae. 



4. Underside of the body, with the base of the legs on one side. 



5. Extremity of the hind leg. 



