oil 



PEOF. E. B. LANKESTEE ON CERTAIN POINTS IN THE 



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

 mesosomatic segment, whilst in the Androctonini (incl. 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 variou? Scorpions. 



A. Androctonus (Pi-ionunis) funestus and several Androctonidse. 



B. Buthus cyiineus and Euscorpionidae and TelegonidsB. 



C. First specimen oi Androctonus (Prionurits) occitanus. 



D. Second specimen of A. occitamxs. 



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

 segments of the metasoma. P, to P^, 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 ifalicus, Scorpio 

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

 A. OGcitanus, 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 (incl. Telego- 

 nini) have simple punctate ornament, whilst all the Androctonini (incl. 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. 



