422 ON SOME EAEE ARACHNIDS 



The whole of the ventral scutum is larger, redder, and 

 better developed than in /. velox. 



The genus Triceris (Sim.) contains only one species, which 

 is of course the present one. One of the specimens 

 was sent to M. E. Simon, who kindly confirmed my identi- 

 fication of it. It inhabits Venezuela and the West Indies. 

 In November, 1908, two females were sent to me by 

 Mr. D. R. Pack-Beresford. These had been found by 

 himself and Mr. R. S. Bagnall inhabiting a hothouse at the 

 Botanic Gardens at Glasnevin near Dublin. The species 

 also occurs in similar situations in Paris. This is the third 

 species of exotic Oonopid found living in hothouses in Britain 

 in a little over a year. Doubtless more of these interesting 

 little animals await discovery, as they seem easily acclimatized 

 if the temperature is high enough for them. 



Family ARGIOPIDvE 



Cornicularia valida sp. nov. (Plate X., fig. 10). 



Length of the female 2*9 mm. The spider is rather larger 

 than the average of C. cuspidata (BL), but one or two females 

 of that species which I have seen reach the same length. 

 C. unicornis (Camb.) is a much smaller spider, the largest 

 specimen I have seen measuring only 275 mm. The present 

 species is, however, more massive than either of its congeners. 



Colour. — The whole spider is of a very dark colour. The 

 cephalothorax is of a deep shining red brown, the abdomen is 

 black above, very dark brown below. 



Cephalothorax. — This is devoid of any ocular eminence 

 or any post-ocular striae. It slopes up nearly uniformly from 

 the thoracic juncture ; its profile, however, shows a slight dip 

 at the occiput. 



Eyes. — Eight in number, and arranged in two rows. All 

 are rather small. The postei'ior row is straight, and the eyes 

 are subequal. The centrals are one diameter apart, and each 

 is separated from its adjacent lateral by a space about equal 

 to one and a half times its diameter. The anterior row is 



