274 

 (i). Tetigonioidea. 



Tctigoiiiidae: Osborn and Ball are the only authors who have 

 paid niiich attention to the metamorphoses of this family, having 

 woi'kcd out in part many of the North American graminicolous 

 species. 



The ova seem to be always elongated, subcylindric, and are 

 deposited on the stems under the leaf-sheaths or in the leaves of 

 the food-plants. 



Omitting of course the usual development of the tarsi from 

 two segments to three, of the nota and flight organs, and the 

 genitalia, the Tetigoniidae seem to alter exceedingly slightly dur- 

 ing their metamorphoses, the head being the principal seat of 

 change. In many formr in which the head is short and more 

 or less transverse in the adult, it is considerably produced and 

 sometimes more or less foliaceous in the nymphs ; I would in- 

 tance Epipsychidion epipyropis (PI. XXIII fig. 6) from Australia, 

 bred up by Koebele and Perkins. 



In Xerophloca viridis, the nymphal vertex is more angulate 

 anteriorly, while in EnacantJiiis aciiniiiiatiis the almost rectangular, 

 adult vertex is very strongly produced before the eyes in the 

 nymph, being as long as wide, anteriorly rounded and distinctly 

 hairy. 



The complete metamorphoses of the dimorphic Doryccphalus 

 platyrhynchus are described and figured by O'sborn and Ball, the 

 lengthening and changes in form of the head being shown. 



In some Agalliinae the nymphs seem to foreshadow those of 

 the Membracidae. Agallia 4-punctata and A. novella (as figured 

 by Osborn and Ball) have the tergites in profile serrate, and 

 the former has two subhorizontal, apically truncate, capital pro- 

 cesses, while the adults in Pediopsis have the vertex deeply an- 

 gulately emarginate basally, this being truncate in the nymphs. 

 The nymphs, moreover, of certain American and Australian 

 forms are quite hairy. 



The metamorphoses (partially or complete) are shown by Os- 

 born and Ball of the following Tetigoniids of interest to work- 

 ers of the Australian fauna, viz : Parabolocratus viridis, Phrynor- 

 iiwrpJins (Atliysamis) obtufiis, Dcltoccphahis abbrcviatus and other 

 species, Platymctopius cincrcus, Idioccnis altcrnatus and other spe- 

 cies, Lonatura catalina, Driotura robnsta, Phlcpsins ncbulosus, etc. 



The following nymphs of Australian forms are now figured ; 

 viz : Tctigonia partliaon, EpipsycJtidion. epipyropis, Rliofidiis ilavoma- 

 ciihrtiis, Sfciwcotis planinscula. 



