336 



of the upper side of the abdomen, is pointed behind, and has 

 two angular points on each side, being also indistinctly odged 

 with dull yellowish. The rest of the upper part and sides is 

 pale dull brownish-yellow, or drab coloured, the latter having 

 several oblique rows of more or less distinctly-marked palo 

 yellowish-white spots. 



The legs are very similar in colour to the cephalo-thorax, 

 thinly and irregularly marked with dark yellowish-brown spots 

 and blotches. The spines on the legs are short and very fine. 



This spider is found, though rather rarely, on the Sandhills 

 along the coast from Poole to Christchurch, and is a very striking 

 instance of adaptation of colouring to the surrounding surface. 

 When at rest, with its legs extended on the sand, it is almost 

 impossible to detect it. Its movements consist of short and rapid 

 runs. On the 6th of June, 1879, I met with an adult female on 

 a sandy part of the Chesil Beach, Portland, near the Ferry 

 Bridge. 



I have not yet succeeded in finding the male. 



GENUS THANATUS, C. L. Koch. PHILODEOMUS, Blackw. 

 (in part). THANATUS, Camlr. (in part). 



This genus differs from Philodromus in the relative size and 

 position of the eyes; those of the anterior row being closer 

 together (thus separating rather more the eyes of each lateral 

 pair), and the external ones of this row being perceptibly larger 

 than the two middle ones. The legs are shorter, stronger, and 

 differ from Philodromus in their relative length, which is 4.2.1.3. 

 Those of the first and third pairs are sometimes equal, and, but 

 very seldom, those of the fourth and second. The tarsi and 

 metatarsi are furnished underneath with a scopula, or brush of 

 short, numerous hairs. 



The spiders of this genus are seldom found upon shrubs, 

 plants, and trees, like the Philodromi, but most commonly upon 

 the ground, and at the bases of plants and herbage ; nor are they 

 so swift in their movements. One species only has as yet been 

 found in Britain, and that one was first found in Dorsetshire. 



