1,62 BRITISH CICADA. 



knee-shaped ; and the end of the ejaciilatory duct is 

 fringed with from three to six laminated processes, 

 which may or may not proceed from brachlets. Con- 

 jecturally these laminae may fmiction as explorers or 

 expanders between the saw-valves. 



With reference to some of the figures given in my 

 foregoing Plates, attention may be called to the fol- 

 lowing as suggestive : — 



Plate III., fig. 6. Issus coleoptratus. Shows the 

 rectal cauda with its sheath (theca ?), accompanied 

 by the superior and inferior accessory processes. 

 Plate IV., figs. 6, 7, 8. Cixhts ncrvosns. Shows the 

 cauda to be somewhat tubular, with the inferior 

 accessory process tufted with cottony fibres. 

 Plate v., fig. 3. Cixius stigmaticus. Probably that 

 part described elsewhere as the penis (q) is really 

 the cauda of the female. 

 Plate VI., fig. 4. Cixius pilosus. The upper part of 



the figure represents the rectal cauda. 

 Plate VIII., fig. 11. Delphax pulchella. The singu- 

 larly formed free styles, drawn below, may 

 perhaps be regarded as the "inferior accessory 

 processes" of Dr. Sharp. 

 Plate XII., fig. 8. Lihurnia giittula. The spatuli- 

 form theca which protects the oedeagus is remark- 

 able ; as also is the form of the penis with its setae. 

 The pincer-like styles appear above. The different 

 shapes of the genitalia of Lihurnia show some 

 obscure likenesses to parts of the Pentatomidse. 

 My figure 2 a on Plate XVIII. shows two chambers 

 to the mouth of the pygofer, accompanied by the 

 superior and inferior processes. The central part 

 probably is the penis. 

 Plate XXL, fig. 3a. Stiroma straminea. The geni- 

 talia of this species are remarkable and complex. 

 The pygofer of Aphrophora appears to be highly 

 specialised, and the same may be said of Idioceriis, 

 Agallia, Euacanthis, and Eupelix. These parts are 

 more simple in Athysanus, but they become again 



