452 MESOZOIC INSECTS OP QUEENSLAND^ ix., 



up not much before the apex of the wing. Rs has, besides the series of four 

 pectinate branches already mentioned in the generic definition, a set of four ter- 

 minal twigs arranged as shown in Text-fig. 74; the branch next below these ends 

 exactly at the apex of the wing. The cross-venation in the spaces between the 

 branches of Rs and M distally is a fine polygonal meshwork, two cells thick 

 within each successive space, the borders of the cells making a slightly irregular 

 line, dividing each space longitudinally about midway. Portions of these are 

 indicated by dotted lines in Text-fig. 74. 



Type, Specimen No. 99, in Coll. Queensland Geol. Survey. 



Horizon, Upper Triassie, Ipswich, Q. 



In Text-fig. 74, the clavus has been restored on the lines shown in the genus 

 Locustopsis Handl., with only two anal veins. 



Order ODONATA. 



Suborder Archizygoptera. 



Family MESOPHLEBIIDAE. 



Further study of the genus Mesophlebia (Tillyard, 1916, p. 24) has con- 

 vinced me that it does not belong to the Anisoptera, but to Haudlii-sch's Sub- 

 order Anisozygoptera, to which also most of the known Liassic Dragonilies be- 

 long. It seems best to treat it for the present as representative of a new family 

 Mesophlebiidae, which shows some affinity with the Liassic Heterophlebiidae. 

 The exact relationships of the new family cannot be accurately determined until 

 the basal half of the wing is discovered. 



:\lESOPHLEBiA ANTiNODALis Till. (Plate Hi., flg. 30; Text-fig. 75.) 



Tillyard, Mesozoic and Tertiaiy Insects of Queensland and New South Wales, 

 Qld. Geol. Survey, Publ. No. 253, 1916, p. 24. 



Specimen 127a represents a fairly well preserved portion of a right forewing 

 of this species, comprising the whole of the costal margin from somewhat before 

 the nodus to a little beyond the pterostigTua, and including the subnodus and all 

 branches of M except M4, of which only a very small portion is preserved. The 

 nodus is incomplete basally by the loss of the costal margin, though Sc is com- 

 plete. The pterostigma is complete and remarkably well preserved. 



Total length of fragment, 28 mm. Distance from nodus to beginning of 

 pterostigma, 12' mm. Length of pterostigma, 3.6 mm. The approximate total 

 length of the wing nlust have been about 40 mm. By comparison with the type 

 specimen, the present wing is found to be somewhat narrower in comparison with 

 its length, and may therefore be considered as a forewing, the type specimen 

 representing a hindwing. The pterostigma, however, is longer than in the type 

 (3.6 mm. as against 2.8 mm.) which is a somewhat anomalous condition. Number 

 of postnodals five, as in type. Pterostigma slightly wider basally than distally.. 

 slightly shorter along costa than along R, and strongly thickened along R. No 

 brace-vein below pterostigma. A strong, oblique subnodus between R 

 and Ml +2, strutted below, between M1..1.2 and Ms, by a much longer oblique 

 cross-vein running in the opposite direction, at right angles to suljnodus. Mi 

 curving upwards so as to come to lie close under pterostigma, as in the type. 

 Structure of MiA and M2 very closely similar to type, but the broadened space 

 between Mi and MiA below distal half of pterostigma carried definitely two rowsi 

 of cellules. A weak oblique vein indicated between M2 and Ms, far from level 

 of nodus, and a similar hut longer oblique Tein below it, between Ms and M.^. 



