BY E. J. TILLYARD. 289 



Order PLANIPENNIA. 



Family PERMITHONIDAE, n. fam. 



Rather small insects with the forewing fairly broad, the apex rather pointed. 

 Sc fusing with Ri distally. Rs pectinately branched, but with the original dicho- 

 tomy of R4+5 preserved. Four cross-veins between Ri and Rs. Radial cell 

 (re) present, closed by a cross vein {ir). M with its original dichotomic branching 

 preserved, and the branches not crushed closely together as in recent Planipennia 

 owing to increase in the number of branches of Rs. Median cell (mc) present, 

 closed by a cross-vein (im). Fairly numerous additional distal forkings on the 

 branches of Rs and M, including small terminal twigging-s. Cubito-median Y-vein 

 still preserved, the upper branch, Ms, very short in comparison with the lower, 

 Cui. Primary cubital fork {cuf) very close to base. Cui a fairly strong convex 

 vein pectinately branched. Cu2 a simple, weak, concave vein. (Anal veins not 

 preserved). 



Genus Pebmithone, n.g. (Plate xxxiii., fig. 3; Text-fig. 6.) 



Characters as for the family, with the following additions: — Costal area 

 moderately broadened near base, the series of costal veinlets not closely crowded 

 together, mostly simple, but a few forked or connected together by short cross- 

 veins. Pterostigmatic veinlets much closer together. A single cross-vein, sc-r, 



Text-fig. 6. Permithone beljiiontensis, n.g. et sp. (x 12). For lettering, see ] 



Wing restored by the removal of the OYerfold (missing veins shown by 

 dotted lines) and placed with apex to the right. 



connects Se with R basally. Five pectinate branches to Rs. Radial cell rather 

 short. Median cell very long; the fork of Mi+s stalked from the cell, that of 

 M3+4 sessile upon it. Cuia with four shoi-t branches; Cuit distally forked. Two 

 medio-cubital cross-veins situated before half-way. A series of inter-cubital 

 cross-veins present. 



(Jenotype, Permithone belmontensis, n.sp. 



This is the first true Lacewing to be discovered in Palaeozoic strata, and is 

 noteworthy in being in some respects even more archaic than the hypothetical 

 Archetype which I postulated for this Order in my previous work on the Panor- 

 poid Complex (These Proceedings, xliv., pt. 3, 1919, p. 699). Apa 



from the 



