﻿3o6 



the Tetigoniidae. The family seems discerptible somewhat nn 

 I he following- lines: 

 flassinae Euptervginae ^ "Stenocotinae 

 J Penthimiinae i Ledrinae 



I Fetit^oniinae 

 vAgalliinae 



\ Ka'havaluinae Ulopinae (? Aleml)raci(laej 



} ? Mego])hthalminae 



The Penthimiinae, Tetigon'iniae, Agalliinae and Eupteryginae 

 being- all derived from lassinae by variotts routes; Stenocotinae 

 from the same via perhaps Tai'tcssns or allied form; Ledrinae 

 possibly from Dorycephaliis or allied forms.* 



Although convenient for grouping the North American forms, 

 \'an Duzee's results do not seem to me to be natural. 



The most primitive known form would seem to be some all}' 

 of Phrynomorphus; frooi this there are many evident ofifshoots. 

 For example through Thamnotettix we arrive at Mctriosteles and 

 its allies without any break, so that Van Duzee's "Cicadidiiii" 

 are difificult to define sharply for a world fauna. The Euptery- 

 gine series would seem to be a logical continuation, the tegmina 

 and wings being greatly and increasingly degraded; in all 

 known forms but one, the radial, median, and cu'bital veins 

 reach the apical cells without forking en route, and the vena- 

 tion is usually so degraded that it is dititicult or impossible to 

 trace the basal half of these veins at all. The discovery of 

 Aiicono, undoubtedly an Eupterygine, shows the more primitive 

 forking of the 'medioradial (which unite again towards the apex) 

 and displays the untenability of deriving the Eupteryginae from 

 the Macrostelines. 



The separation of the "Dorydini" is not I think scientific; 

 elongation of the head springs up independently many where; 

 for example Phrynophycs and Giifardia from Phrynoinorphiis; 

 Hccalns and its allies from Thomsonia or allies; Ccplialcliis from 

 near Dorycephaliis which arises elsewhere. 



The value of the transverse vein near the 'base of the tegmen 

 between the radial and median veins was hotly criticized by Os- 

 born and P)all, who denied it even specific value, but I have 

 seen no public retraction by Van Duzee. The following groups 

 seem more or less well circumscribed: 



(i) lassinae, corresponding to the Jassina of Van Duzee, a 



* Tt is possililo. osiM'Oially al'tov h (■(Hisidci'ul ion nf I lie i)yiii]ilis. Iliat tlic SiciMiciiIiiiac 

 arc ail ui^'sliodt frotii llic lA'i'li-iiiac. 



