456 



On the Nervous System of the Strepsiptera. 



LII. — On the Nervous System of the Streps i2ytera. 

 By Prof. Edward Bhandt*. 



The nervous system 

 of the 8trepsiptera has 

 not been subjected to 

 any special researches, 

 C. Th. von.Sieboldt 

 only states that these 

 insects {Xenos ves- 

 parum) have one tho- 

 racic ganglion ; but 

 he does not say any 

 thing about the num- 

 ber of cephalic and 

 abdominal ganglia. 



My researches have 

 been limited to four 

 females and one male 

 of StyJops melittce^ and 

 one female of Xenos 

 vesparunij preserved 

 in spirit. 



The results of my 

 researches are the fol- 

 lowing : — 



1. The cephalic di- 

 vision of the nervous 

 system consists of the 

 ganglion supraoeso- 

 phageum only, the 

 ganglion infraoesopha- 

 geum being absent. 



2. The thoracic di- 

 vision consists of a 

 large ganglion con- 

 taining five pairs of 

 nuclei ; it is divided 

 into two parts : — an 

 anterior and smaller 

 one, corresponding to 

 the ganglion infraoeso- 

 phagemn and to the 

 first thoracic ganglion 



* Abstract, communicated bv the Author, of a niciudir jiriutt-d in 

 Russian, St. Petersburg, 1878. 



t 0. Th. von Siobold, ' I^ehrbuch d.-r \er<>leichenden Anatomie," Tli. i. 

 (Berlin, 1848), p. .>^2. 



