612 



THE PANORPOID COMPLEX, Hi., 



Sc is preserved, as shown in the Archetype. As in the case 

 of the Protomecoptera, I took this branch originally for a true 

 costal vein. Further study of the fossil has, however, convinced 



2A 1A Cu 2 



Text-Fig.65. 

 Forewing of the Archetype of the Order Paratrichoptera. Lettering as 

 on p. 535. 



me that it is a true branch of Sc, since it is evidently a concave 

 vein, and its attachment to Sc can actually be made out in the 

 fossil itself. 



The cross-vein system is most abundant in Mesopanorpodes, 

 Mesopsijche and Neuropsyche. The zig-zagging of the veins R 4 

 and R 5 in Mesopsijche (5, PL vii., fig. 1), caused by the in- 

 cidence of the two cross-veins already mentioned above, is a 

 specialisation, and is not to be found in Mesopanorpodes, winch 

 possesses the same two cross-veins. It is, therefore, omitted from 

 the Archetype, which is made to resemble Mesopanorpodes in the 

 nearly straight condition of these two veins. But this latter 

 genus is specialised in having the forking of R44-5 placed more 

 distally than that of R2+3 ; so that the Archetype must be 'made 

 to agree Avith the other four genera in this respect. All the 

 cross- veins shown 'in Text-fig. 65 are to be found in one or other 

 of the five genera comprising the Order Paratrichoptera. 



It is quite impossible, at present, to say what is the sig- 

 nificance of the two strong oblique veins descending from Citj 

 They are not present in Mesopanorpodes, Mesopsyclie or Neuro- 

 psyche; but both are preserved intact in Aristo psyche, and the 

 more distal one is also clearly to be seen in Triassopsyehe. As 

 there is no sign of the sockets of the macrotrichia upon these 



