BY R. J. TILLYARD. 



453 



Distad from level of nodus, M4 arches I'ather sharjjly downwards away from 

 Ms, as also in type. 



The differences to be noted between the new specimen and the type consist 

 in the presence of a definite subnodus normally placed, the absence of the weak 

 pterostigmatic brace-vein shown in the type, the longer pterostigma, and the 

 double row of cellules distally below the pterostigma. As the type was not very 

 well preserved in places, it is possible that these differences may not really 

 have been as gi'eat as they appear, e.g., the apparent brace-vein in the type may 

 be only very slightly different from the normal cross- vein of the present specimen, 



Heautotype. {see Plate lii 

 larked -f , concave veins - 



Text-fig. la.—Mesophlebia antinodalis Till. 



fig. 30.) (x 3.5). Convex veins 

 Text-fig. 76. — Tfiassophlebia stigmatica, n.g. et sp. Fragment of 



(x 5). Convex veins marked -|-, concave veins — . 



while the subnodus may be present in the type, but indistinct, and the same may 

 be true of the double row of cellules below the pterostigma. I have therefore 

 decided not to give the new fossil a separate specific name, but to include it in the 

 species Af. antinodalis Till., allowing a certain amount of variability in the length 

 of the pterostigma in this species, and in one or two other characters. It is a 

 gTeat pity that this second fossil shows practically the same portions of the wing 

 preserved as in the type, while the important region of arculus and discoidal 

 cell still remains undiscovered. 



Type, Specimen No. 3a, and Type-Counterpart Spec. No. 36. Heautotype, 

 Specimen No. 127a. All in Coll. Queensland Geol. Survey, Brisbane. 



