378 



PROF. E. E. LANKESTEE ON CEETAIN POINTS IN THE 



prosomatic ganglion, and the first of the two mesosomatic ganglia lies in the third 

 mesosomatic segment, whilst in the Androctonini (inch Centrurini) both the regions of 

 the first and of the second pairs of lung-books are innervated from the prosomatic 

 ganglion, and the first mesosomatic ganglion lies in the fourth mesosomatic segment. 

 The broad first segment of the metasoma has a ganglion in both cases. 



Fig. 2. 



Diagrams of the arrangement of the chief nerves and ganglia in various Scorpions. 



A. Androctonus (Prionurus) funestus and several Androctonidse. 



B. Bulhus cynneus and Euscorpionidae and Telegonidae. 



C. First specimen of Androctonus (Prionurus) occitanv.s. 



D. Second specimen of A. occitanus. 



1-6, the six segments of the prosoma. 7-12, the six segments of the mesosoma. 13, 14, the two first 

 segments of the metasoma. P, to P 4 , the four pairs of lung-books. 



This generalization is based on the examination of the nerve-ganglia of two species of 

 Telegonini (one from Coquimbo, the other from Tasmania) of Scorpio italicus, Scorpio 

 cyaneus, and Brotheas subnitens on the one hand, and of those of Androctonus funestus, 

 A. occitanus, A. americanus, and A. hottentotus on the other hand. 



An examination of the sculpturing of the chitinous surface of the lamellae of the 

 lung-books in the same species has shown further that all the Scorpionini (inch Telego- 

 nini) have simple punctate ornament, whilst all the Androctonini (inch Centrurini) have 

 reticulate ornament in addition to punctiform. The latter is drawn in PI. LXXXI. 

 figs. 5 and 6, the former in PI. LXXXI. fig. 7. 



