1881.] REV. O. p. CAMBRIDGE ON NEW ARANEIDEA. 771 



The female differs from the male chiefl}' in the abdomen being not 

 quite so long, and the caput wanting the elevation of the fore part. 



This curious Spider is nearlj' allied to Ariamnes {Ariadne) Jlagellum, 

 Do!., but is, I think, quite distinct. The extraordinary development 

 of the posterior part of the abdomen is perhaps one of the eccentrici- 

 ties in the Spider world least easy to be accounted for. Both sexes 

 were contained in the collection of South-American Spiders sent to 

 me by Prof. Traill, and were found on the Amazons. 



Fam. Gasteracanthid^. 

 Gen. Mutina, Cambr. 

 MuTiNA furcifera, sp. n. (Plate LXYI. fig. 4.) 



Length of the adult male 1^ line ; breadth of the abdomen at its 

 widest part 1^. 



This curiously formed Spider is nearly allied to Mutina prospiciens, 

 Cambr. (Ann. & Mag. N. H. ser. 4, vol. xiv. p. 175, pi. xvii. fig. 3, 

 1874), described under the generic name of Cafydna, which, having 

 been found to be preoccupied, was changed to Mutina (vide Zool. 

 Rec. xi. p. 231). 



The present Spider, however, may be at once distinguished by the 

 simpler and more cylindrical form of the remarkable processes at tlie 

 extremity of which the lateral pairs of eyes are seated, and especially 

 by the equally long corneous nose-like process issuing from the 

 clvpeus immediately beneath the four central eyes ; this process, 

 which is of a cylindrical form, is a little bent, and points rather down- 

 wards ; it is smallest in the middle, gradually lessening from the 

 base, and enlarging again towards its extremity, where it is strongly 

 and very distinctly bifid or forked. 



The cephaJothorax is somewhat elongated quadrate, strongly con- 

 stricted on the margins and sides at the caput. The four central 

 eyes are placed at the fore extremity of a slightly prominent portion 

 of the caput ; they are rather large, and describe very nearly a square 

 whose fore side is rather the shortest. The colour of the cephalo- 

 thorax is a deep reddish yellow-brown, the fore part being the palest. 



The legs are rather short, moderately strong, 1, 2, 4, 3, furnished 

 with hairs and a very few long bristles ; a short strongish spine 

 issues from a tubercle in front of the femora of the second pair, and 

 some very short, somewhat tuberculiform spines in a single row along 

 the underside of the tibiae of the same pair. The colour of the legs 

 is yellow-brown ; the femora and fore part of the tibiae of the first and 

 second pairs strongly suffused with dark brown, as also are the femora 

 of the fourth pair. 



The paljii are very short ; the digital joint is large, and the palpal 

 organs complex and enormously developed. 



The abdomen is of a short heart-shape and of a dull brownish 

 yellow hue. The upper surface is rather flat, corneous, and presents 

 traces more or less distinct of the various sigilliform markings cha- 

 racteristic of the Gasteracanthidae. A kind of corneous point ter- 

 minates the underside of the connecting pedicle, and projects 



