328 REV. O. p. CAMBRIDGE ON SPIDERS [Apr. 20, 



trideuticulate on their outer sides, and a lateral, elongate, somewhat 

 triangular silvery patch near the upper part on each side, the apes 

 of the abdomen also being of a silvery colour. 



This variety is the one figured (Plate XXVIII. figs. 2 a', b'), and 

 is a very striking and beautiful one : in most varieties the two ordi- 

 nary silver spots underneath, in a transverse line in front of the 

 spinners, are visible ; but none were apparent in the variety figured. 



In this variety also the legs are nearly black, softening to a dark 

 brown towards their extremities, the metatarsi being pale yellow- 

 brown. Other varieties, in which the silvery hues of the abdomen 

 prevail, have the legs of a more or less dark yellow-brown, the fore 

 extremities of the tibice of tlie first pair being black-brown, and the 

 tarsi and metatarsi light yellowish brown. The legs are slender, 

 furnished with fine hairs only ; their length is moderate, those of 

 the first pair, as usual, considerably the longest, and those of the 

 third pair very short — 1, 2, 4, 3. 



The colour of the cephalothorax appears to vary with the general 

 colouring of the legs and abdomen, the lighter-coloured examples 

 having a more or less dark yellow-brown cephalothorax, while that 

 of the dark examples is a deep black-brown. 



Examples of this species were contained in the collection of 

 Spiders sent to me from the Arnazons by Professor Traill. 



Argyrodes abscissa, sp. n. (Plate XXIX. fig. 7.) 



Adult male, length to the spinners If line, and to the apex of 

 the abdomen 2\. 



In the form of the fore part of the caput this Spider is not unlike 

 Argyrodes epeirce, Sim., with the lower prominence or lobe cut off 

 near its base. This lobe has therefore a truncated appearance, and 

 is much shorter and less robust than the upper one ; its extremity 

 is furnished thickly with strong prominent hairs forming a tuft ; 

 those of the upper lobe are less numerous, and, as usual, directed 

 forwards ; this latter lobe forms a strong subcorneal eminence 

 rounded at its apex and protruding upwards from between the four 

 central eyes, its base occupying the whole of the quadrate area 

 comprised within them. 



Looked at in profile, the caput rises gradually from the thorax, 

 and there is a slight dip or depression between the eyes of the hind 

 central pair. The thorax is more than usually gibbous just behind 

 the thoracic indentation. 



The colour of the cephalothorax is dark yellowish brown. 



The leffs are dull brownish yellow, the genual joints and a small 

 portion at the fore extremity of the tibiae and metatarsi of those of 

 the third and fourth pairs being of a darker hue, giving those legs a 

 slightly annulate appearance ; they are long and slender, but not in- 

 ordinately so, and are furnished with short fine hairs only. 



The palpi are rather long and strong. The radial and cubital 

 joints are of about equal length ; both are strong, the latter bent and 

 clavate, the former broad and dilated at the anterior extremity. 

 The digital joint is rather large, strongly bifid at its extremity, and 



