BY R. .1. TILLYARD. 



170 



Some other scattered cross-veins are present, but are not easily 

 discernible. [Pvest of wing missing]. 



G e n o t V p ©1 P rotopsijchopsis venosfi, n.sp. 



This genus would appear to be very closely allied tu Bionyid- 

 artieUa Handlirsch, and Mesopsi/chopsisYL-AwdVuiiiLh, both Jurassic 

 forms, but differs from them in possessing a broader costal field 

 apically, and in the presence of the three gradate series. It is 

 also tindoubtedly closely allied to our Australian genus Fsydiop 

 sis, which is one of the most archaic forms of Planipennia still 

 existing. The arrangement of the gradate series, some as com- 

 plete straight lines across the wing, and some as step-veins, is 

 exactly tliat found in Fsychopsis. Frofo^jsychopsis, however, 

 differs from Fsychopsis in not having the costal field unduly 

 widened, and in lacking (as 

 far as we can see in the frag Sc.. 

 ment preserved) the multiple -^•• -•y | | [ I T I 'rf 



A. 



B. 



C. 



Text-tiir.l. 



forkings of the costal cross- 

 veins, and their breaking up 

 by cross-veinlets, which is 

 characteristic of Fsychopsis. 

 Also, in Fsychopsis, Sc and 11 

 stand further apart, and there 

 is a linking-up of Sc, R, and 

 lis distal ly by two strong 

 cross- veins, which close off the 

 closely-veined njarginal area 

 from the three strong main veins with their intermediate cross- 

 veins. In Psycliopsis illidgei, however, this arrangement 

 remains only partially completed, so th'dt Frolopsychopsis venosa, 

 Fsychopsis ilHdyei, and Fs. e/eymis, for instance, form (for this 

 character) a phylogenetic series, as shown in Text-lig.J. 



There can be little doubt that our rec-.ent genus Fsychopsis is 

 a direct descendant from a form similar U) Frotopsychopsis. 



* Phyloweny of the distal ends of Sc, R, and Rs in Protopsychop'^is and 

 Fsychop'<if<. A, oldest stage (Protopsi/chopsis renof<a, n.g. et sp. ). B, 

 intermediate stage (Psf/rliop-^is! illidyd Froggatt). C, final stage (Fi<ychop- 

 sis elegansiiwr.), with the three veins strongly linked together ])j' cross- 

 veins. 



