3°4 



SCIENCE- G OS SIP. 



The caput of the male is rounded and considerably 

 raised. The body is glossy black and the legs 

 yellowish-red. It is a very rare species. . 



GENUS STYLOCTETOR SIM. 



The spiders included in this genus are very similar 

 to those of the genus Cnephalocotes, differing chiefly 

 in the size and position of the tibial spines. In the 

 present genus they are long, or, at least, longer than 

 the diameter of the joint from which they spring, 

 and, in the case of the tibiae of the fourth pair of 

 legs, are placed nearer the end of the joint than in 

 Cnephalocotes. 



Styloetetor penicillatus YVestr. 



This species, which is not very rare, may be easily 

 distinguished from its allies by the possession of a 

 tuft of bristly hairs upon the radial joint of the male 

 palpus. 



Fig. 2. Cornicvlaria unicornis Cb. 

 Male, and palpus viewed from beneath. See p. 267. 



Styloetetor broecha L. Koch. 



A most curious and interesting species. The 

 spiracular plates of the male are strongly corrugated, 

 and are acted upon by projections on the coxae of 

 the fourth pair of legs. This arrangement enables 

 the creature to make a sound which, though im- 

 perceptible to human ears, is no doubt of use to the 

 spider, probably as a call-note to his mate. 



GENUS METAPOBACTRUS SUM. 



This genus differs from Tapinocyba in the following 

 points. The anterior row of eyes is curved, its con- 

 vexity being directed backwards. The ocular area 

 and clypeus are about equal in width. The tarsi of 

 the anterior pair of legs are hardly more than three- 

 quarters the length of the metatarsi. 



Metapobactrus prominulus Cb. ( Walcken- 



aera promimda in '•' Spiders of Dorset.") 



Length. Male 2 mm. 



Cephalo-thorax blackish-brown. Legs reddish- 

 yellow. Abdomen black. A very rare species. 



GENUS POCADICNEMIS SIM. 



In this genus the hairs and spines upon the legs are 

 long and rather robust. The posterior extremity of 

 the sternum is very broad. The eyes of the posterior 

 row are equidistant. 



Bl. 



Walckenaera 



Pocadicnemis pumilus 

 pumila Bl.) 



Length. Male 1.5 mm., female 1.7 mm. 



The palpal organs of the male are complex, and 

 have connected with their structure a long coiled 

 spine. Blackwall states that this species is found 

 under stones in meadows. It is not common. 



GENUS ARAEONCUS SIM. . 



The spiders included in this genus bear a strong 

 resemblance to those of the genus Troxochrus. The 

 following characteristics of the present genus, how- 

 ever, will separate them without difficulty. The 

 distance between the posterior central eyes is never 

 less than that between one of them and the adjacent 

 lateral eye. The spines on the .tibiae of the fourth 

 pair of legs are not near the middle of the joint, as 

 they are in Troxochrus. The integument of the 

 abdomen is not coriaceous. 



Araeoneus humilis Bl. {Walckenaera humilis 

 Bl.) 



Length. Male 1.5 mm., female 1.7 mm. 



The caput of the male is elevated and rounded, but 

 has no distinct eminence. The anterior central eyes 

 are small and close together. 



GENUS MINYRIOLUS SIM. 



This genus may be distinguished from Pa?iamomops > 

 to which it is closely allied, by the eyes of the pos- 

 terior row being equidistant and close together. 



Minyriolus pusillus Wid. ( Walckenaera 

 pusilla in " Spiders of Dorset.") 



This very rare spider is extremely minute, the adult 

 male scarcely exceeding one millimetre in length. 

 {To be continued.} 



Tricentenary of Tycho Brahe. — The Royal 

 Academy of Sweden intend holding a special meet- 

 ing on October 24th to commemorate the three- 

 hundredth anniversary of the death of the founder 

 of modern practical astronomy. 



