120 REV. O. P. CAMBRIDGE ON SOME NEW [Jail. 21, 



above, it is almost round except, the fore part, where the clypeus juts 

 forward in a broad and square form. Its colour is a deep brown, 

 marked and mottled with yellowish and with a yellow margin, the 

 caput being furnished with short erect bristly hairs ; but the exam- 

 ple was much damaged, so that little beyond the form and colour of 

 the cephalothorax, and the position of the eyes, could be ascertained 

 with certainty. 



The eyes are very minute, forming two parallel curved rows, which 

 occupy the whole width of the caput, those of the lateral pairs being 

 the largest, the fore laterals largest of the eight, seated on a strong 

 tubercle, and separated by a tolerable interval from the hind laterals ; 

 between the two lateral pairs and rather in front of their straight line 

 the four central eyes form a small quadrangular figure, whose fore side 

 is the shortest ; the height of the clypeus is equal to the longitudinal 

 diameter of the figure formed by these four small eyes. The falces 

 are short, strong, rather projecting, and equal to the facial space 

 in length. 



The legs do not differ much in length, their relative length being 

 apparently 2, 1, 4, 3, the difference between 2-1 and 4-3 being 

 very slight. 



The abdomen was too much damaged to enable any description to 

 be given ; but the peculiar form of the caput (vide Plate XIII. fig. 4 a, 

 b, c,e) distinguishes it at once from any described species known to me. 

 The labium appeared to be longer than broad, somewhat elongated and 

 pointed at its apex. The figures given of the labium and maxillae 

 are, it is believed, tolerably correct. When the now numerous Spiders 

 of the genus Thomisus (Bl.) are divided, this Spider will probably 

 form one of the genus Xysticus (Koch). A single example is in the 

 Hope Collection at the University Museum, Oxford ; but its locality 

 is unknown. 



Thomisus opportunus, sp. n. (Plate XIII. fig. 5.) 



Female adult, length lg line. 



The cephalothorax of this species is massive and nearly square, 

 with the corners rounded off, very convex above, the sides nearly ver- 

 tical, and the hind slope abrupt, giving it a very Salticiform appear- 

 ance ; its surface is glossy, and the normal grooves and indentations 

 are quite obsolete ; the colour is deep red chestnut-brown, darkest in 

 front, owing to the eyes being seated on largish black spots, and 

 it is sparingly furnished with a few short hairs ; the height of the 

 clypeus equals nearly about one third that of the facial space. 



The eyes are unequal in size, and though preserving the Thomsi- 

 form position, yet occupy a larger space on the fore part of the caput 

 than usual, the laterals being far more distant from each other than 

 ordinarily ; in fact they may be best described as in three transverse 

 lines, 4, 2, 2. 



The laterals of the first or foremost row (which consists of four 

 eyes) are large, far the largest of the eight, and occupy the extreme 

 fore corners of the upperside of the caput ; the two centrals of this 

 row are small and separated from each other by about an eye's 



