BY K. .). TILLYARD. 205 



II oriz o n : Upper Triassic, Ipswich, Q. 



A study of the four genera of Paratrichoptera now known 

 from Ipswich makes it extremely questionable whether they can 

 be regarded as lying in the direct ancestral line of the present 

 Tricboptera. It is, of course, quite certain that recent Tri- 

 choptera must have been originally derived from Trichopterous- 

 like insects in which the high specialisation of the anal veins, 

 now present throughout the Order, had not been established. 

 Hut all archaic recent Tricboptera have a very definite dichotomy 

 of the first cubitus distally, forming the fifth apical fork; whereas 

 it is quite evident that the Paratrichoptera did not possess this 

 fork, but had instead a straight Cu l5 of the type seen in all fossil 

 and recent Mecoptera. 



Order PLANIPENNIA. 



Family PROHEMEROBIID^S. 



In No. 1 of this Series (3, p. 178), I described from Ipswich the 

 genus Protopsychopsis, placing it in the above family for reasons 

 there given. Since then, I have received a very beautifully pre- 

 served fragment of a 1'rohemerobiid wing, showing most of the 

 basal part of the wing, with all the most important veins pre- 

 served. This fossil appeared at first to be so exactly like the 

 recent Meyapsy chops illidyei that I began to think that the 

 family Prohemerobiidce could no longer be maintained. However, 

 a careful study of the new fossil shows certain important differ- 

 ences, which, taken in conjunction with our knowledge of the 

 Liassic and Jurassic Proheme7 , obiid(e of Europe, and of the recent 

 Psychopsidte, make it quite certain that the former family must 

 be maintained; while it is now capable of definite proof that the 

 latter family is a direct descendant therefrom. This proof will 

 be furnished below, after the definition of the new genus, and 

 the description of the fossil, have been given. 



Genus Archepsy CHOPS, n.g. (Text-tig. 27 ). 

 Characters of preserved basal pari of forewing as in the recent 

 Meyapsychops, with the following differences :— Costal veinlets 

 at extreme base arising at right angles to Sc, the recurrent vein 



