56 OlJ SOAlE RARE ARACHNIDS 



towards the cephalothorax. The whole surface of the ventral 

 scutum bears plenty of coarse hairs. 



Lamy* in his description of the tracheae of the Oonopidas 

 utilizes as types Dysderina loricata (E. Sim.) and Oonops 

 pulcher (Tempi.). I know nothing of the former spider. I 

 have however spent some time examining the respiratory 

 organs of our indigenous Oonops, and cannot altogether agree 

 with Lamy's account. He states that instead of two separate 

 tracheal stigmata he sees a transverse slit dilated at its 

 extremities into two orifices. Each of these possesses two 

 strongly chitinized lips. The transverse slit leads into a deep 

 fold in the integument which is prolonged at its extremities 

 into two tracheal trunks. What really exists is as follows. 



There undoubtedly is a transverse shallow groove running 

 across the abdomen almost parallel with the rima genitahs. 

 This again is undoubtedly dilated in a somewhat oval form at 

 each lateral extremity. But the spiracles are perfectly distinct 

 and independent. Each opens at the very extremity of the 

 dilated terminations of the groove, from which it is distinctly 

 separated by its strongly chitinous internal lip. Each is 

 irregularly oval and bears a small projection on its anterior 

 lip. Each leads into a separate tracheal trunk like those of 

 Ischnothyreus. The groove itself is very shallow, and its 

 floor is formed of rather thin chitin. It leads into no tracheae, 

 nor are its dilated ends spiracles. It is in fact the same 

 structure as the curved chitinous band which in Ischnothyreus 

 forms the posterior boundary of the ventral scutvim, and upon 

 which the posterior spiracles are placed. According to Lamy 

 it is a median vestibule into the extremities of which the 

 lateral tracheal systems open. This as I have shown is 

 incorrect, since the spiracles are quite independent of one 

 another, and each is separated from this transverse groove by 

 well defined lips, and each is not (as shown in Lamy's figure) 

 merely one of the chitinized extremities of a median, slit-like 

 spiracle. 



* E. Lamy, Recherches sur les Traohe'es des Aralgne'es, pp. 177-179 aud fignii-e, 

 1902. 



