454 MESOZOIC INSECTS OF QUEENSLAND, ix.. 



Genus Triassophlebia, n.g. ( Text-flg. 76. ) 



Pterostigma elongated, about twice as long as in Mesophlebia. Postnodcds 

 numerous and close together. Mi only slightly converging towards R beneath 

 distal end of pterostigma. Mia and M2 very much as in Mesophlebia, but MiA 

 definitely arising from M2. Supplementary sectors present distally between Mi 

 and MiA, also between Mia and M2. Ms running very close below M2 at level 

 of origin of MiA, as in Mesophlebia, but no oblique vein visible between M2 and 

 Ms. Two rows of cellules present distally between M2 and Ms. Ms lies further 

 away from Ms than in Mesophlebia, with two rows of cellules between them at 

 the level of the origin of MiA, increasing to three and then to four rows distally. 

 M4 not arching strongly downwards away from M3. (Rest of wing not pre- 

 served). 



Genotype, Triassophlebia stigmatiea, n.sp. (Upper Triassie, Ipswieh, 



Q-). 



This new genus^ may be placed provisionally within the Mesophlebiidae, pend- 

 ing the discovery of more complete material. 



Triassophlebia stigmatica, n.sp. (Text-fig. 76.) 



Total length of fragment, about 14 mm., probably representing a total wing- 

 length of at least 40 mm. Number of postnodals preserved or partially pre- 

 served, eight, indicating a total of about twelve. Pterostigma covering about 

 nine or ten cellules. R somewhat thickened below pterostigma, but not so strongly 

 as in Mesophlebia antinodalis. Mia arises from M2 as a well defined vein, 

 strongly convex, well before the level of the pterostigma, and continues strongly 

 to below the middle of the latter, when it becomes slightly kinked in one or two 

 places, as shown in Text-flg. 76. Supplementary sector above Mia preceded by 

 three irregularly divided cellules; that below Mia is a straight sector from its 

 very beginning, preceded by a single row of cellules. M2 arising from M as a 

 strongly diverging vein which almost at once approaches Ms very closely, being 

 separated from it only by a single row of very narrow cellules; further distad, 

 below the level of the pterostigma, these two veins diverge somewhat, and are 

 separated by two rows of cellules. The portion of Ms preserved runs sub- 

 parallel to Ms, and is separated from it mostly by two rows of cellules, increas- 

 ing to three or four rows of smaller cellules distally. Only a small portion of 

 M4 is preserved, diverging slightly from Ms, and separated from it by a single 

 row of cellules. 



Type, Specimen No. 82a in Coll. Queensland Geological Survey, Brisbane. 



Horizon, Upper Triassie, Ipswich, Q. 



Suborder Anisozygoptera. 



Family TRIASSAGRIONIDAE, n.fam. 



Sc greatly shortened, ending up at less than one-fourth of the wing-length. 

 Probably only two antenodals present. No definite nodus formed. Postnodals 

 numerous. A true pterostigma present. Base of wing petiolate, very narrow. 

 M fused with R basally, diverging very gently from it at the arculus, which is 

 incomplete posteriorly. No true discoidal cell present. At the arculus M 

 divides into M1-3 and M4; tlie former is a strong concave vein, running below 

 and sub-parallel to Ri, and g'ving off (a) the common stem of Ms and Ms, and 

 (b) at about twice as far from the arculus, the stem of M2. M2 arises from 

 Ml a little before half-way along the wing, arching strongly downwards, and 



