^77 



drop of clear liquid at the mouth of the tube which is habitually 

 half or nearly full of this liquid, the production being increased 

 in warm weather. Eucalypti are rich in calcium compounds and 

 the lime of the shell is evidently derived from the sap of the tree. 

 Ratte roughly calculated a proportion of 75 per cent of carbo- 

 nate of lime, the insoluble remains being considered as chitinous 

 matter. In the nymph, two of the tergites (apparently 2nd and 

 3rd in the forms I have seen) are curiously modified, being much 

 enlarged and more strongly chitinized than the rest of the ab- 

 domen, there is a longitudinal false suture. 'Ihis structure acts 

 as an operculum. (PI. XXIII figs. 12 and 13.) 



Ratte describes them all under the generic name Ptychis, but I 

 cannot place them there and moreover at least four genera are 

 icquired for their reception. Polydiaciophycs and Pccfiiiario[>l!ycs 

 are described later on. 



The nymphs of the Sinhalese Machacrota guttii:^cra Westwood, 

 (■(jnstruct tubes fixed to the twigs of Adaiisoiiia digitata, liquid 

 exuding drop by dro]) from the mouth of the tube. 



(2) Fulgoroidca. 



As previously mentioned the nymphs in this superfamily nre 

 extraordinarily richly endowed with special sensory organs, i. e., 

 large, punctured, granules. 1 have reframed from discussing 

 the grouping of these organs in the various subfamilies, as my 

 material is as yet insufficient. 



Ftdgoridac : The nymphs in the famil}' seem to resemble the 

 adults very strongly, but the stages liave not been worked out. 

 Pyrops has been figured by Burmeister.* 



Asiracidac : I have observed the metamorphoses more or less 

 completely of several species, but only outline them here, as 

 later on, I hope to be able to compare all the stages in a num- 

 ber of forms. The study of the nymphal instars will, it is evi- 

 dent, be a great aid in the natural classification of this difficult 

 group. 



Pcrkinsiella saccharicida. 



(PI. XXYI. figs. 1-5.) 



Copulation takes place at night, the adult hoppers, most of 

 \^hich lie still or hidden by day, emerging in crowds from their 

 concealment at or shortly before dark. 



*Townsend has noted the ovipositioii of the Cixiine OerUi/s. fPsvche 1892 VI, .",.'):!) 

 and Osborn has related the life-habits of the root-inhabiting Ci.xiine MynJus radicis 

 (Ohio Nat. I'JO:! IV, i:;.) 



