82 



L September, 



The nervous system, consisting o£ double chords, frequently 

 coalescing in the thorax, presents different aspects in the various 



species. The pro- and meso- 

 thorax are largest and con- 

 tiguous (Rech. anatom. et 

 Phys. sur les Hemipteres, L. 

 Dufour, p. 265), and from the 

 latter ? the nerve connected 

 with the " mii'rors " (^^) is 

 symmetrically given off. In 

 the male pJeheia it is most 

 obvious. Here it may easily 

 be traced round the motor 

 muscle of the tymbal to the 

 apical angle of the frame, 

 within which it forms a gan- 

 glion that enters a groove. 

 The other end of this groove 

 lies towards the callosities, 

 where a nervous chord may 

 be traced from the outer rim 

 of "mirror" to the tracheal 

 pipe (t) from the first ab- 

 dominal spiracle. This chord is situated at the edge of the membrane 

 (C. JicBviatodes), or is free (0. pleheia) ; and passes over or surrounds 

 the callosity («?'). But in the female Cicadce the arrangement is 

 different, and the ganglion does not lie within the frame. Of the 

 recognised parts of insect auditory organs I reserve specialisation of 

 Miiller's ganglion, which should be represented by the portion of the 

 acoustic nerve lying on the callosity (W). 



Guildford : February 22nd, 1879. 



Scale f 



EXPLANATION OP FIGURE. 



m, m' Chitinous pieces. 

 n-n Acoustic nerve. 

 i Trachea. 



DESCEIPTION OF A NEW SPECIES OF TRIOZA. 

 BT J. LICHTENSTEIN. 



Tbioza ATEIPLICIS. 

 (^. Head, pro- and meso-notum black, shining. Elytra clear, 

 transparent, nerves fine, radial cell lanceolate, terminating in the costal 

 margin at a little more than its own length from the apex ; costal 

 margin convex, forming a continuous curve from base to apex. Ster- 

 num and legs white. 



