terminal segment in some male Hemiptera. 403 



Tesseratoma, especially as regards the internal terminal 

 process, and I do not know whether this can be brought 

 into such a position as to be pressed upon by the inferior 

 process. There is no incrassation of the lip of the 

 chamber in the middle behind. 



The colour of the dorsal plates of the hind body in this 

 insect is in life magnificent, being of a brilliant metallic 

 colour, in tint between violet and purple. This fades 

 after death, but may be restored by thoroughly wetting 

 the insect. 



The diaphragm projects strongly on each side of the 

 Cauda in an angular manner, forming thus a superior 

 lateral process of a much less perfectly differentiated 

 character than it assumes in many other species where 

 it is present. 



5. Eiisthenes2yratti,Dist. Hab. Central China. Fig. 4, 

 PL XII. — The Cauda is short, not deilexed, but projecting 

 backwards, fuscous in colour, with white membranous 

 extremity, the orifice open and exposed ; the diaphragm 

 surrounding the base of the cauda is white, membranous. 

 The theca is a nearly transparent, white, longitudinally 

 striated structure : from its middle projects the extremity 

 of the cedeagus. This organ also is quite white, and 

 appears semimembranous, but is really of chitinous con- 

 sistency ; its exposed part is of irregular form, but 

 possesses a large cleft along the middle, and from this 

 there projects a perfectly transparent, very elongate, 

 thread-like structure (the true iutromittent organ, I 

 presume) : within the theca, on each side, there is a 

 slender free wing, something like a small compressed 

 rod ; this is rather darker in colour than the other parts 

 of the cedeagus. 



The lateral appendages are placed rather deep down, 

 and are therefore not very conspicuous, but are of com- 

 plex form ; the terminal part of each forms two lobes, 

 one of which is slender and polished, and reflexed 

 upwards just before the orifice of the cauda, its extremity 

 just touching that of its fellow of the opposite side ; the 

 other lobe is much broader, placed more externally, and 

 bears much long pubescence. The inferior process is 

 placed just below the inner pair of the lobes of the lateral 

 appendage, and is shaped like the terminal portion of 

 the bowl of a spoon. 



