TRAP-DOOR SPIDERS, 267 



the eyes, yet we must be prepared to find exceptions 

 to the rule derived from the most exact measarements 

 in any individual instance. 



In the present species the above conclusions, as to 

 position and size, are drawn from a consideration and 

 comparison of 20 examples, and are, it is believed, 

 pretty true, but yet in one example, one of the hind 

 central eyes was but half the size of the other, and in 

 another example one of the same eyes was but one- 

 fourth of that of the other, a mere dot in fact, and the 

 relative size of the respective lateral eyes of the two 

 rows do not appear to maintain exactly the same 

 proportions in all individuals. The height of the 

 clypeus appeared to be as nearly as possible half that 

 of the facial space. 



The leys are strong, moderately long, their relative 

 length 4, 1, 2, 3, though in some examples those of the 

 second and third pairs are er^ual in length ; in others, 

 those of the third pair are slightly longer than those 

 of the second ; here again, as with the e^^s, although 

 the relative proportion of the legs of spiders is an 

 important specific point, and in general tolerably 

 reliable, yet accurate observation and measurements 

 prove that there are small differences in individual 

 instances. Tlie legs are yellow-brown in colour, fur- 

 nished with hairs, bristles, and a few spines. The 

 outer sides of the genual joints of the third pair are 

 destitute of spines ; in two instances only out of 20, 

 this joint had a single, not very conspicuous, spine. 

 The superior tarsal claws have 4-5 minute pectina- 

 tions underneath near their base. 



The paljJt are moderately long and strong, and 



